{"id":16,"date":"2023-05-24T11:27:49","date_gmt":"2023-05-24T02:27:49","guid":{"rendered":"http:\/\/app006.xsrv.jp\/chiba-u-tsuda\/?page_id=16"},"modified":"2025-06-03T20:24:52","modified_gmt":"2025-06-03T11:24:52","slug":"research","status":"publish","type":"page","link":"https:\/\/www.tp.chiba-u.jp\/tsuda_lab\/research\/","title":{"rendered":"\u7814\u7a76\u7d39\u4ecb"},"content":{"rendered":"\n

\u6211\u3005\u306e\u7814\u7a76\u5ba4\u3067\u306f\u3001\u30a4\u30aa\u30f3\u6db2\u4f53\u3001\u96fb\u6c17\u5316\u5b66\u3001\u6750\u6599\u79d1\u5b66\u3092\u57fa\u76e4\u3068\u3057\u305f\u7814\u7a76\u3092\u884c\u3044\u3001SDGs\u306e\u9054\u6210\u306b\u8ca2\u732e\u3067\u304d\u308b\u69d8\u3005\u306a\u30a8\u30cd\u30eb\u30ae\u30fc\u6750\u6599\u3001\u84c4\u96fb\u30c7\u30d0\u30a4\u30b9\u3001\u8cc7\u6e90\u5faa\u74b0\u30d7\u30ed\u30bb\u30b9\u3001\u5206\u6790\u6280\u8853\u306e\u958b\u767a\u306b\u53d6\u308a\u7d44\u3093\u3067\u3044\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n

Our laboratory conducts researches based on ionic liquids, electrochemistry, and materials science, and is working on the development of various energy materials, energy storage devices, resource recycling processes, and analytical techniques that can contribute to the achievement of the SDGs.<\/p>\n\n\n\n

\u3010\u30a4\u30aa\u30f3\u306e\u307f\u304b\u3089\u69cb\u6210\u3055\u308c\u308b\u6db2\u4f53\u5869: \u30a4\u30aa\u30f3\u6db2\u4f53\u3011<\/strong><\/h2>\n\n\n\n

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\u3010Liquid salts composed only of ions: ionic liquids\u3011<\/strong><\/h2>\n\n\n\n

Ionic liquids (also called room-temperature molten salts or ambient-temperature molten salts) are a general term for salts that have a liquid phase at room temperature, i.e., those are composed only of cations (+ ions) and anions (- ions). In general, ionic species that constitute ionic liquids are organic ions and complex ions, and their volume is inevitably larger than that of monatomic ions. Therefore, the surface charge density of the ionic species forming the ionic liquid is lower than that of monatomic ions. In addition, since these ion species have various molecular vibrational modes, they have large entropy, and bulky ion species can be expected to reduce the interaction between ions due to the effect of steric hindrance. For these reasons, the melting points of ionic liquids are much lower than inorganic salts such as NaCl.<\/p>\n\n\n\n

Ionic liquids are unique liquids that have a combination of features such as a low liquidus temperature range, low volatility, flame retardancy, and relatively high ionic conductivity. Some of these features are obtained by interactions between cations and anions that are neither strong nor weak. In other words, it is no exaggeration to say that “Understanding ionic liquids at the molecular level means knowing the origin of their physical properties. In our laboratory, we are working to understand ionic liquids based on basic science, and we are also trying to develop a wide range of applications for ionic liquids, such as using them as functional materials and reaction media!<\/p>\n\n\n\n

\u3010\u96fb\u6c17\u5316\u5b66\u3068\u6750\u6599\u79d1\u5b66\u3011<\/strong><\/strong><\/h2>\n\n\n\n

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\u3010<\/strong>Electrochemistry and Materials Science<\/strong>\u3011<\/strong><\/strong><\/h2>\n\n\n\n

Since electrochemistry is a study that deals with chemical phenomena involving charged particles such as electrons and ions, the fields covered include not only physical chemistry, inorganic chemistry and analytical chemistry, but also organic chemistry and biochemistry. Therefore, electrochemical reactions are widely used in industrial electrolysis, electroplating, electrophoretic coating, batteries, sensors, semiconductors, and in vivo reactions. Materials science, on the other hand, is a field of study that clarifies the causes of the manifestation of inherent physical properties in substances, and uses that knowledge to create new materials. Electrochemistry and materials science go well together, and energy materials can be said to be a research subject at the boundary between these two disciplines. This includes not only synthesizing the energetic materials themselves, but also analyzing and observing the processes by which the energetic materials are used to convert chemical energy into electrical energy (and vice versa).<\/p>\n\n\n\n

\u3010\u30a4\u30aa\u30f3\u6db2\u4f53 \u00d7 \u96fb\u6c17\u5316\u5b66 \u00d7 \u6750\u6599\u79d1\u5b66 +\u3000\u4f4e\u74b0\u5883\u8ca0\u8377\u3000+\u3000\u6c4e\u7528\u5143\u7d20\u3000= \uff1f\u3000\u3011<\/strong><\/h2>\n\n\n\n

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\u3010<\/strong>Ionic liquids <\/strong>\u00d7<\/strong> <\/strong>electrochemistry <\/strong>\u00d7 <\/strong>materials science + low environmental impact + common elements = ?<\/strong>\u3000\u3011<\/strong><\/strong><\/h2>\n\n\n\n

In our laboratory, we aim to create novel materials, devices, and recycling technologies that support the future of mankind, by adding two keywords, low environmental impact and general-purpose elements, which are indispensable for achieving the SDGs, to the three research fields of ionic liquids, electrochemistry, and materials science. In order to realize this, Here are some examples of researches that Tsuda has conducted.<\/p>\n\n\n\n

\u3010\u65b0\u3057\u3044\u30a4\u30aa\u30f3\u6db2\u4f53\u306e\u958b\u767a<\/strong>\u3011<\/h2>\n\n\n\n

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Development of Novel Ionic Liquids<\/strong><\/h3>\n\n\n\n

By making full use of methods such as molecular design of organic cations using synthetic chemical methods and controlling the structure of complex ions, it is possible to gain target physical properties in ionic liquids. For the latter, for example, introducing a functional group such as a thiocyanate group into the structure of the anion species induces an increase in entropy and decrease in the structural symmetry of the anion. As a result, we have succeeded in lowering the liquidus temperature range and the electrical improving transport properties of ionic liquids, which are extremely important parameters in electrochemical reactions. Such an approach has made it possible to prepare ionic liquids using only inorganic salts without using organic salts (inorganic ionic liquids).<\/p>\n\n\n

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\u30a8\u30cd\u30eb\u30ae\u30fc\u6750\u6599\u306e\u30ef\u30f3\u30dd\u30c3\u30c8\u8abf\u88fd<\/strong><\/h3>\n\n\n\n

\u6211\u3005\u306e\u793e\u4f1a\u304c\u69d8\u3005\u306a\u6750\u6599\u306b\u3088\u3063\u3066\u652f\u3048\u3089\u308c\u3066\u3044\u308b\u3053\u3068\u306f\u3088\u304f\u77e5\u3089\u308c\u3066\u3044\u308b\u304c\u3001\u305d\u306e\u4e2d\u306b\u306f\u76f4\u63a5\u7684\u306b\u76ee\u306b\u3059\u308b\u3053\u3068\u306e\u5c11\u306a\u3044\u5fae\u5c0f\u306a\u30b5\u30a4\u30ba\u306e\u6750\u6599\u3082\u3042\u308b\u3002\u305d\u306e\u4ee3\u8868\u4f8b\u304c\u30ca\u30ce\u7c92\u5b50\u3067\u3042\u308b\u3002\u6750\u6599\u306e\u30ca\u30ce\u7c92\u5b50\u5316\u306f\u8cea\u91cf\u3042\u305f\u308a\u306e\u6bd4\u8868\u9762\u7a4d\u3092\u5897\u5927\u3055\u305b\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u91cf\u5b50\u30b5\u30a4\u30ba\u52b9\u679c\u306e\u767a\u73fe\u306b\u5bc4\u4e0e\u3059\u308b\u3053\u3068\u3082\u5c11\u306a\u304f\u306a\u3044\u3002\u3057\u304b\u3057\u3001\u30ca\u30ce\u7c92\u5b50\u306f\u8868\u9762\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u9ad8\u304f\u3001\u5bb9\u6613\u306b\u51dd\u96c6\u3059\u308b\u305f\u3081\u3001\u5b89\u5b9a\u5316\u5264\uff08\u30a2\u30df\u30f3\u3001\u30c1\u30aa\u30fc\u30eb\u3001\u9ad8\u5206\u5b50\u306a\u3069\uff09\u306b\u3088\u308b\u8868\u9762\u4fee\u98fe\u304c\u5fc5\u8981\u4e0d\u53ef\u6b20\u3067\u3042\u308b\u3002\u3057\u304b\u3057\u3001\u8208\u5473\u6df1\u3044\u3053\u3068\u306b\u3001\u30a4\u30aa\u30f3\u6db2\u4f53\u3092\u30ca\u30ce\u7c92\u5b50\u306e\u8abf\u88fd\u7528\u53cd\u5fdc\u5a92\u4f53\u3068\u3057\u3066\u7528\u3044\u305f\u5834\u5408\u3001\u5b89\u5b9a\u5316\u5264\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u8abf\u88fd\u3057\u305f\u30ca\u30ce\u7c92\u5b50\u306f\u30a4\u30aa\u30f3\u6db2\u4f53\u306b\u3088\u3063\u3066\u5b89\u5b9a\u5316\u3055\u308c\u308b\u3002\u305f\u3060\u3057\u3001\u5b89\u5b9a\u5316\u5264\u307b\u3069\u306e\u5f37\u3044\u76f8\u4e92\u4f5c\u7528\u306f\u306a\u3044\u3088\u3046\u3067\u3042\u308b\u3002\u6211\u3005\u306f\u3053\u306e\u77e5\u898b\u3092\u5229\u7528\u3057\u3066\u3001\u30a4\u30aa\u30f3\u6db2\u4f53\u4e2d\u306b\u30bf\u30fc\u30b2\u30c3\u30c8\u3068\u3059\u308b\u91d1\u5c5e\u7a2e\u3092\u542b\u3080\u524d\u99c6\u4f53\uff08\u4f8b\u3048\u3070\u3001Pt\u3067\u3042\u308c\u3070\u3001\u767d\u91d1\u30a2\u30bb\u30c1\u30eb\u30a2\u30bb\u30c8\u30ca\u30c8\uff08Pt(acac)2<\/sub>\uff09\u306a\u3069\uff09\u3092\u52a0\u3048\u3001\u6eb6\u89e3\u307e\u305f\u306f\u5358\u5206\u6563\u3055\u305b\u305f\u306e\u3061\u3001\u52a0\u71b1\u3059\u308b\u3060\u3051\u3067\u30bf\u30fc\u30b2\u30c3\u30c8\u3068\u3059\u308b\u91d1\u5c5e\u3084\u5408\u91d1\u306e\u30ca\u30ce\u7c92\u5b50\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3053\u3068\u3092\u898b\u3044\u51fa\u3057\u305f\u3010\u30a4\u30aa\u30f3\u6db2\u4f53\uff0d\u71b1\u5206\u89e3\u6cd5\u3011 (Fig. 1)\u3002\u672c\u624b\u6cd5\u3092\u884c\u3046\u969b\u306b\u3001\u30ca\u30ce\u7c92\u5b50\u3092\u62c5\u6301\u3055\u305b\u305f\u3044\u70ad\u7d20\u6750\u6599\u3092\u4e00\u7dd2\u306b\u6df7\u305c\u3066\u304a\u304f\u3068\u3001\u30ef\u30f3\u30dd\u30c3\u30c8\u30d7\u30ed\u30bb\u30b9\u3067\u30ca\u30ce\u7c92\u5b50\u304c\u62c5\u6301\u3055\u308c\u305f\u70ad\u7d20\u6750\u6599\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u30a8\u30cd\u30eb\u30ae\u30fc\u6750\u6599\u3068\u3057\u3066\u8a55\u4fa1\u3092\u884c\u3063\u3066\u3044\u308b\u3002\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u306f\u30b9\u30b1\u30fc\u30eb\u30a2\u30c3\u30d7\u304c\u5bb9\u6613\u3067\u3042\u308b\u305f\u3081\u3001\u5de5\u696d\u5316\u304c\u5bb9\u6613\u3067\u3042\u308b\u3068\u3044\u3063\u305f\u7279\u5fb4\u3082\u3042\u308b\u3002<\/p>\n\n\n\n

One-Pot Preparation of Energy Materials<\/strong><\/h3>\n\n\n\n

It is well known that our modern life is supported by various materials, but some of them are microscopic materials that we rarely see directly. A typical example is nanoparticles. Making bulk materials into nanoparticles not only increases the specific surface area per mass, but also often develops the quantum size effect. However, since nanoparticles have high surface energy and easily aggregate, surface modification with stabilizers (amines, thiols, polymers, etc.) is essential. Interestingly, however, when an ionic liquid is used as the reaction medium for the preparation of nanoparticles, the resulting nanoparticles are stabilized by the ionic liquid without the use of a stabilizing agent. The interaction appears to be weaker than with stabilizers. Using this knowledge, we found a new approach for nanoparticle preparation [ionic liquid-pyrolytic method] consisting of a process of adding a precursor containing the target metal species (e.g., platinum(II) acetylacetonate (Pt(acac)2<\/sub>) for Pt) to ionic liquid and a process of heating the ionic liquid with the precursor. When using this method, if the carbon materials to be supported with nanoparticles are mixed together, a nanoparticle-supported carbon material can be produced in a one-pot process, and is being evaluated as an energy material. Since this process is easy to scale up, it also has the feature of being easy to industrialize.<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n


<\/p>\n\n\n\n

Fig. 1 (a) Outline of a Pt nanoparticle supported carbon material preparation process by IL-pyrolysis method. (b-d) TEM images of Pt nanoparticle supported carbon materials prepared in [C4<\/sub>mim][Tf2<\/sub>N]. The carbon materials were (b) thick graphene nanoplatelets (20-30 graphene layers, GNP-20), (c) thin graphene nanoplatelets (< 3 graphene layers, GNP-3), and (d) MWCNT.<\/p>\n\n\n\n

\u96fb\u6c17\u5316\u5b66\u53cd\u5fdc\u306e\u305d\u306e\u5834\uff08<\/u>in situ, operando\uff09\u89b3\u5bdf<\/u><\/h3>\n\n\n\n

\u4e8c\u6b21\u96fb\u6c60\u306f\u30e6\u30d3\u30ad\u30bf\u30b9\u793e\u4f1a\u3084\u4f4e\u70ad\u7d20\u5316\u793e\u4f1a\u3092\u652f\u3048\u308b\u91cd\u8981\u306a\u84c4\u96fb\u30c7\u30d0\u30a4\u30b9\u3067\u3042\u308a\u3001\u305d\u306e\u9069\u7528\u7bc4\u56f2\u306f\u5e83\u304c\u308b\u4e00\u65b9\u3067\u3042\u308b\u3002\u305d\u308c\u306b\u4f34\u3044\u3001\u3088\u308a\u9ad8\u6027\u80fd\u306a\u4e8c\u6b21\u96fb\u6c60\u306e\u767b\u5834\u304c\u671f\u5f85\u3055\u308c\u3066\u3044\u308b\u3002\u7279\u306b\u3001\u96fb\u6c60\u306e\u9ad8\u5bb9\u91cf\u5316\u306b\u3064\u3044\u3066\u306f\u81ea\u52d5\u8eca\u696d\u754c\u304b\u3089\u306e\u30cb\u30fc\u30ba\u304c\u9ad8\u304f\u3001\u71be\u70c8\u306a\u7814\u7a76\u958b\u767a\u7af6\u4e89\u304c\u4e16\u754c\u7684\u306b\u7e70\u308a\u5e83\u3052\u3089\u308c\u3066\u3044\u308b\u3002\u3053\u306e\u3088\u3046\u306a\u80cc\u666f\u304b\u3089\u3001\u3088\u308a\u591a\u304f\u306e\u96fb\u6c17\u3092\u5316\u5b66\u30a8\u30cd\u30eb\u30ae\u30fc\u3068\u3057\u3066\u8caf\u3081\u8fbc\u3080\u3053\u3068\u306e\u3067\u304d\u308b\u96fb\u6975\u6d3b\u7269\u8cea\u306b\u95a2\u3059\u308b\u5831\u544a\u304c\u6570\u591a\u304f\u5b58\u5728\u3057\u3001\u65e2\u5b58\u306e\u30ea\u30c1\u30a6\u30e0\u30a4\u30aa\u30f3\u96fb\u6c60\u7528\u6d3b\u7269\u8cea\u306e\u5bb9\u91cf\u3092\u5927\u304d\u304f\u8d85\u3048\u308b\u3082\u306e\u3082\u73cd\u3057\u304f\u306a\u3044\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u5145\u653e\u96fb\u5bb9\u91cf\u306e\u98db\u8e8d\u7684\u306a\u5897\u5927\u306f\u6d3b\u7269\u8cea\u306e\u8457\u3057\u3044\u4f53\u7a4d\u5909\u5316\u3092\u5f15\u304d\u8d77\u3053\u3057\u3001\u96fb\u6c60\u306e\u52a3\u5316\u3092\u52a0\u901f\u3059\u308b\u3002\u305d\u306e\u305f\u3081\u3001\u5145\u653e\u96fb\u6642\u306b\u304a\u3051\u308b\u6d3b\u7269\u8cea\u306e\u5f62\u614b\u5909\u5316\u3092\u6b63\u3057\u304f\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u96fb\u6c60\u6027\u80fd\u306e\u5411\u4e0a\u306b\u76f4\u7d50\u3059\u308b\u6975\u3081\u3066\u91cd\u8981\u306a\u60c5\u5831\u3068\u306a\u308b\u3002<\/strong><\/p>\n\n\n\n

\u30a4\u30aa\u30f3\u6db2\u4f53\u306f\u96e3\u63ee\u767a\u6027\u3001\u975e\u5e2f\u96fb\u6027\u3001\u30a4\u30aa\u30f3\u4f1d\u5c0e\u6027\u3092\u6709\u3059\u308b\u5ba4\u6e29\u3067\u6db2\u4f53\u306e\u5869\u3067\u3042\u308a\u3001\u6211\u3005\u306f\u3053\u308c\u3092\u5229\u7528\u3057\u305f\u96fb\u5b50\u9855\u5fae\u93e1\u89b3\u5bdf\u6cd5\u306e\u69cb\u7bc9\u306b\u53d6\u308a\u7d44\u3093\u3067\u304d\u305f\u3002\u3053\u306e\u89b3\u5bdf\u6cd5\u306e\u7279\u5fb4\u306f\u96fb\u89e3\u8cea\u304c\u6db2\u4f53\u3067\u3042\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u5bc6\u9589\u30bb\u30eb\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306a\u304f\u50cf\u304c\u5f97\u3089\u308c\u308b\u70b9\u306b\u3042\u308a\u3001\u96fb\u6c17\u5316\u5b66\u53cd\u5fdc\u306e\u89b3\u5bdf\u6642\u306b\u304a\u3044\u3066\u3082\u4f8b\u5916\u3067\u306f\u306a\u3044\u3002\u30a4\u30aa\u30f3\u6db2\u4f53\u96fb\u89e3\u6db2\u3092\u7528\u3044\u3066\u96fb\u6c60\u53cd\u5fdc\u3092\u305d\u306e\u5834\u89b3\u5bdf\u3059\u308b\u969b\u306e\u30bb\u30eb\u3084\u30db\u30eb\u30c0\u30fc\u306e\u4f8b\u3092Fig. 2\u306b\u793a\u3057\u3066\u3044\u308b\u3002\u6211\u3005\u306f\u3053\u308c\u307e\u3067\u306b\u3001\u30b7\u30ea\u30b3\u30f3\u3001\u30ea\u30c1\u30a6\u30e0\u3001\u30de\u30b0\u30cd\u30b7\u30a6\u30e0\u3001\u4e9c\u925b\u3068\u3044\u3063\u305f\u6b21\u4e16\u4ee3\u4e8c\u6b21\u96fb\u6c60\u7528\u9ad8\u5bb9\u91cf\u8ca0\u6975\u6d3b\u7269\u8cea\u306e\u30a4\u30aa\u30f3\u6db2\u4f53\u96fb\u89e3\u6db2\u4e2d\u306b\u304a\u3051\u308b\u5145\u653e\u96fb\u6319\u52d5\u3092\u305d\u306e\u5834SEM\/TEM\u89b3\u5bdf\u306b\u3088\u3063\u3066\u8abf\u67fb\u3059\u308b\u3053\u3068\u306b\u6210\u529f\u3057\u3066\u304a\u308a\u3001\u305d\u306e\u77e5\u898b\u3092\u8ca0\u6975\u6d3b\u7269\u8cea\u306e\u6750\u6599\u8a2d\u8a08\u306b\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3057\u3066\u3044\u308b\u3002\u3053\u3053\u3067\u84c4\u7a4d\u3057\u305f\u305d\u306e\u5834SEM\/TEM\u89b3\u5bdf\u306e\u30ce\u30a6\u30cf\u30a6\u306f\u5206\u5149\u5206\u6790\u306a\u3069\u3078\u5c55\u958b\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

In situ \/ Operando Observation of Electrochemical Reactions<\/strong><\/h3>\n\n\n\n

Secondary batteries are important power storage devices that support a ubiquitous society and a low-carbon society, and their scope of application continues to expand. Along with this, the advent of secondary batteries with higher performance is expected. In particular, there is a high demand from the automobile industry for high-capacity batteries, and fierce research and development competition is taking place worldwide. Against this background, there are many reports on electrode active materials that can store more electricity as chemical energy, and it is not uncommon for the capacity to greatly exceed the capacity of existing active materials for lithium ion batteries. However, a dramatic increase in charge\/discharge capacity causes a significant change in volume of the active material, accelerating deterioration of the battery. Therefore, correct understanding of the morphological change of the active material during charging and discharging is extremely important information that directly leads to the improvement of battery performance.<\/p>\n\n\n\n

Ionic liquids have negligible vapor pressure, flame-retardant, and anti-static nature. Using this feature, we have been working on the electron microscope observation techniques. The feature of this observation method is that an image can be obtained without using a closed cell even though the electrolyte is liquid, and the observation of electrochemical reactions is no exception. Figure 2 shows examples of cells and a holder for operando\/in situ electron microscope observation of battery reactions using an ionic liquid electrolyte. We have so far succeeded in investigating the charge-discharge behavior of high-capacity negative electrode active materials for next-generation secondary batteries such as silicon, lithium, magnesium, and zinc in ionic liquid electrolytes by in-situ SEM\/TEM observation. This knowledge is fed back to the material design of the negative electrode active material. Know-how accumulated here concerning the in-situ SEM\/TEM observation can also be applied to spectroscopic analysis.<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

Fig. 2 Schematic drawings and photographs of (a, b) the three-electrode cell, (c, d, f) the coin-type cell for in situ<\/em>\/operando<\/em> SEM observation and (g) the window-less miniature cell for in situ <\/em>TEM observation. (e) SEM image of a cross-sectional view of the coin-type cell depicted in Fig. 2d. (f) This coin-type cell is used for obtaining the information on the variation in anode surface during battery reactions.<\/p>\n\n\n\n

\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u30cf\u30a4\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u30ea\u30b5\u30a4\u30af\u30eb<\/strong><\/h3>\n\n\n\n

\u4e16\u754c\u4eba\u53e3\u306e\u7206\u767a\u7684\u306a\u5897\u52a0\u306f\u8cc7\u6e90\u4f7f\u7528\u91cf\u306e\u5897\u5927\u3092\u5f15\u304d\u8d77\u3053\u3057\u3001\u9244\u3084\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u3068\u3044\u3063\u305f\u5730\u6bbb\u5b58\u5728\u91cf\u306e\u591a\u3044\u91d1\u5c5e\u3067\u3055\u3048\u3001\u30ea\u30b5\u30a4\u30af\u30eb\u306a\u3057\u3067\u306f\u5c06\u6765\u7684\u306b\u67af\u6e07\u3059\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u3044\u3002\u307e\u305f\u3001\u305d\u308c\u3089\u91d1\u5c5e\u306e\u88fd\u932c\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u3063\u3066\u5927\u91cf\u306e\u6e29\u5ba4\u52b9\u679c\u30ac\u30b9\u304c\u653e\u51fa\u3055\u308c\u308b\u3002\u91d1\u5c5e\u306e\u6c34\u5e73\u30ea\u30b5\u30a4\u30af\u30eb\u30d7\u30ed\u30bb\u30b9\u306f\u8cc7\u6e90\u306e\u6709\u52b9\u5229\u7528\u3068\u65b0\u5730\u91d1\u306e\u88fd\u9020\u306b\u4f34\u3046\u74b0\u5883\u8ca0\u8377\u306e\u4f4e\u6e1b\u3092\u53ef\u80fd\u3068\u3059\u308b\u3053\u3068\u304b\u3089\u3001\u307e\u3059\u307e\u3059\u305d\u306e\u91cd\u8981\u6027\u306f\u9ad8\u307e\u308b\u3068\u8003\u3048\u3089\u308c\u308b\u3002\u3053\u306e\u3088\u3046\u306a\u80cc\u666f\u304b\u3089\u3001\u6700\u8fd1\u3067\u306f\u5869\u5316\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\uff08AlCl3<\/sub>\uff09\u7cfb\u30a4\u30aa\u30f3\u6db2\u4f53\u3092\u7528\u3044\u305f\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u96fb\u6c17\u3081\u3063\u304d\u6280\u8853\u306e\u6c34\u5e73\u30ea\u30b5\u30a4\u30af\u30eb\u30d7\u30ed\u30bb\u30b9\u3078\u306e\u5c55\u958b\u304c\u691c\u8a0e\u3055\u308c\u3066\u3044\u308b\u3002\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u306f\u30db\u30fc\u30eb\u30fb\u30a8\u30eb\u30fc\u6cd5\u306b\u3088\u308b\u751f\u7523\u306b\u5fc5\u8981\u306a\u96fb\u529b\u539f\u5358\u4f4d\u304c13,000 \uff5e 15,000 kWh t-1<\/sup>\u306b\u3082\u306a\u308b\u3053\u3068\u304b\u3089\u3001\u3010\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u306f\u96fb\u6c17\u306e\u7f36\u8a70\u3011\u3068\u63f6\u63c4\u3055\u308c\u308b\u3053\u3068\u3082\u591a\u3044\u304c\u3001\u30ea\u30b5\u30a4\u30af\u30eb\u306b\u5fc5\u8981\u306a\u30a8\u30cd\u30eb\u30ae\u30fc\u91cf\u306f\u65b0\u5730\u91d1\u306e\u88fd\u932c\u6642\u306b\u6295\u5165\u3055\u308c\u308b\u30a8\u30cd\u30eb\u30ae\u30fc\u91cf\u306e\u308f\u305a\u304b3 \uff5e 5 %\u7a0b\u5ea6\u3067\u3042\u308b\u3002\u3057\u304b\u3057\u3001\u3053\u306e\u30ea\u30b5\u30a4\u30af\u30eb\u306b\u3088\u3063\u3066\u5f97\u3089\u308c\u308bAl\u306e\u7d14\u5ea6\u306f\u65b0\u5730\u91d1\u306b\u52a3\u308b\u3002\u3064\u307e\u308a\u3001\u65e2\u5b58\u306e\u30d7\u30ed\u30bb\u30b9\u3067\u306e\u6c34\u5e73\u30ea\u30b5\u30a4\u30af\u30eb\u306f\u56f0\u96e3\u3068\u8a00\u3048\u308b\u3002\u30ea\u30b5\u30a4\u30af\u30eb\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u306b\u306f\u30b7\u30ea\u30b3\u30f3\u3092\u4e2d\u5fc3\u3068\u3057\u305f\u4e0d\u7d14\u7269\u304c\u84c4\u7a4d\u3057\u3001\u6700\u7d42\u7684\u306b\u306f\u30b9\u30af\u30e9\u30c3\u30d7\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u3068\u3057\u3066\u5ec3\u68c4\u3055\u308c\u308b\u3053\u3068\u306b\u306a\u308b\u3002\u4eca\u5f8c\u3001\u305d\u306e\u5ec3\u68c4\u91cf\u306f\u5897\u52a0\u306e\u4e00\u9014\u3092\u8fbf\u308b\u3068\u4e88\u60f3\u3055\u308c\u3066\u3044\u308b\u3002\u6211\u3005\u306f\u3001\u5869\u5316\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u7cfb\u30a4\u30aa\u30f3\u6db2\u4f53\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u30b9\u30af\u30e9\u30c3\u30d7\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u3092\u4f4e\u96fb\u529b\u539f\u5358\u4f4d\u3067\u65b0\u5730\u91d1\u306e\u30ec\u30d9\u30eb\u306b\u307e\u3067\u9ad8\u7d14\u5ea6\u5316\u3067\u304d\u308b\u5de5\u696d\u30d7\u30ed\u30bb\u30b9\u306e\u958b\u767a\u306b\u53d6\u308a\u7d44\u3093\u3067\u3044\u308b\u3002<\/p>\n\n\n\n

Aluminum High Upgrade Recycling<\/strong><\/h3>\n\n\n\n

Explosive growth in the world’s population will lead to increased resource use, and even metals with high abundance in the earth’s crust, such as iron and aluminum, are likely to be depleted in the future without recycling. Also, the smelting process of these metals releases large amounts of greenhouse gases. The horizontal metal recycling process is expected to become more and more important because it enables effective utilization of resources and reduction of the environmental burden associated with the production of new ingots. In this context, recently, the application of aluminum electroplating technology using aluminum chloride (AlCl3<\/sub>)-based ionic liquid to a horizontal recycling process has been investigated. Since aluminum requires 13,000 to 15,000 kWh t-1<\/sup> of electric power for production by the Hall-Heroult method, it is often ridiculed that aluminum is canned electricity. But, the amount of energy required for recycling is only about 3 to 5% of the amount of energy input during the smelting of new ingots. Unfortunately, the purity of Al obtained by this recycling is inferior to virgin metal. In other words, it can be said that horizontal recycling in the existing process is difficult. Repeatedly recycled aluminum accumulates impurities, mainly silicon, and is eventually discarded as scrap aluminum. It is expected that the amount of waste will continue to increase in the future. We are working on the development of an industrial process that can purify scrap aluminum to the level of new ingots with low power consumption by using AlCl3<\/sub>-based ionic liquids.<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u91d1\u5c5e\u8ca0\u6975\u30a2\u30cb\u30aa\u30f3\u4e8c\u6b21\u96fb\u6c60<\/strong><\/h3>\n\n\n\n

\u30e6\u30d3\u30ad\u30bf\u30b9\u793e\u4f1a\u3001\u4f4e\u70ad\u7d20\u5316\u793e\u4f1a\u3078\u306e\u6025\u901f\u306a\u79fb\u884c\u306b\u3088\u3063\u3066\u84c4\u96fb\u6c60\u306b\u5bfe\u3059\u308b\u671f\u5f85\u306f\u9ad8\u307e\u308a\u7d9a\u3051\u3066\u304a\u308a\u3001\u305d\u306e\u9069\u7528\u7bc4\u56f2\u306f\u62e1\u5927\u3057\u7d9a\u3051\u3066\u3044\u308b\u3002\u3057\u304b\u3057\u3001\u84c4\u96fb\u6c60\u3092\u69cb\u6210\u3059\u308b\u5143\u7d20\u306e\u306a\u304b\u306b\u306f\u3001\u8cc7\u6e90\u91cf\u306b\u4e0d\u5b89\u3092\u62b1\u3048\u308b\u3082\u306e\u3082\u3042\u308a\u3001\u3053\u308c\u307e\u3067\u306e\u3088\u3046\u306b\u5358\u306b\u96fb\u6c60\u6027\u80fd\u3060\u3051\u3092\u8ffd\u3044\u6c42\u3081\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u8cc7\u6e90\u91cf\u3068\u3044\u3063\u305f\u89b3\u70b9\u304b\u3089\u84c4\u96fb\u6c60\u3092\u8a2d\u8a08\u3057\u3001\u5275\u308b\u3053\u3068\u3082\u91cd\u8981\u306b\u306a\u3063\u3066\u304d\u3066\u3044\u308b\u3002\u4f8b\u3048\u3070\u3001\u30ea\u30c1\u30a6\u30e0\u30a4\u30aa\u30f3\u96fb\u6c60\u306b\u53d6\u3063\u3066\u4ee3\u308f\u308b\u84c4\u96fb\u6c60\u3068\u3057\u3066\u3001\u30ea\u30c1\u30a6\u30e0\u30a4\u30aa\u30f3\u3068\u540c\u3058\u30a2\u30eb\u30ab\u30ea\u91d1\u5c5e\u30a4\u30aa\u30f3\u3067\u3042\u308b\u30ca\u30c8\u30ea\u30a6\u30e0\u30a4\u30aa\u30f3\u3084\u30ab\u30ea\u30a6\u30e0\u30a4\u30aa\u30f3\u3092\u7528\u3044\u305f\u96fb\u6c60\u7cfb\u304c\u63d0\u6848\u3055\u308c\u3001\u4ee3\u66ff\u96fb\u6c60\u3068\u3057\u3066\u306e\u5229\u7528\u304c\u5b9f\u73fe\u3057\u3064\u3064\u3042\u308b\u3002\u6700\u8fd1\u3067\u306f\u3001\u30de\u30b0\u30cd\u30b7\u30a6\u30e0\uff083833 mAh cm\u22123<\/sup>, 2205 mAh g\u22121<\/sup>\uff09\u3084\u4e9c\u925b\uff085854 mAh cm\u22123<\/sup>, 820 mAh g\u22121<\/sup>\uff09\u3001\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\uff088046 mAh cm\u22123<\/sup>, 2980 mAh g\u22121<\/sup>\uff09\u306e\u3088\u3046\u306a\u9ad8\u5bb9\u91cf\u6c4e\u7528\u591a\u4fa1\u91d1\u5c5e\u3092\u8ca0\u6975\u306b\u7528\u3044\u305f\u96fb\u6c60\u7cfb\u306b\u95a2\u3059\u308b\u7814\u7a76\u3082\u6d3b\u767a\u5316\u3057\u3066\u3044\u308b\uff08\u62ec\u5f27\u5185\u306e\u5024\u306f\u7406\u8ad6\u4f53\u7a4d\u5bb9\u91cf\uff08mAh cm\u22123<\/sup>\uff09\u3068\u7406\u8ad6\u91cd\u91cf\u5bb9\u91cf\uff08mAh g\u22121<\/sup>\uff09\u3092\u793a\u3057\u3066\u304a\u308a\u3001 \u30ea\u30c1\u30a6\u30e0\u306f\u30012066 mAh cm\u22123<\/sup>\u30013862 mAh g\u22121<\/sup>\u3067\u3042\u308b\u3002\uff09\u3002\u7406\u8ad6\u4f53\u7a4d\u5bb9\u91cf\u3067\u6bd4\u8f03\u3059\u308b\u3068\u3001\u4e0a\u8ff0\u3057\u305f3\u3064\u306e\u591a\u4fa1\u91d1\u5c5e\u306e\u65b9\u304c\u30ea\u30c1\u30a6\u30e0\u3088\u308a\u3082\u5927\u304d\u3044\u3002\u9650\u3089\u308c\u305f\u30b9\u30da\u30fc\u30b9\u3067\u96fb\u6c60\u3092\u914d\u7f6e\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u5834\u5408\u3001\u3053\u308c\u3089\u306e\u91d1\u5c5e\u8ca0\u6975\u3092\u4f7f\u3063\u305f\u96fb\u6c60\u304c\u6709\u5229\u306b\u306a\u308b\u3053\u3068\u3082\u5341\u5206\u306b\u60f3\u5b9a\u3055\u308c\u308b\u3002<\/p>\n\n\n\n

\u96fb\u6c60\u3092\u69cb\u6210\u3059\u308b\u4e3b\u8981\u90e8\u6750\u306f\u8ca0\u6975\u3001\u6b63\u6975\u3001\u96fb\u89e3\u8cea\u3067\u3042\u308b\u3002\u3053\u308c\u3089\u306b\u306f\u591a\u7a2e\u591a\u69d8\u306a\u5143\u7d20\u304c\u5229\u7528\u3055\u308c\u3066\u304a\u308a\u3001\u6c4e\u7528\u5143\u7d20\u3060\u3051\u3067\u84c4\u96fb\u6c60\u7cfb\u3092\u69cb\u7bc9\u3059\u308b\u3053\u3068\u306f\u610f\u5916\u306b\u96e3\u3057\u3044\u3002\u6211\u3005\u306f\u8cc7\u6e90\u91cf\u304c\u8c4a\u5bcc\u3067\u3042\u308a\u3001\u6975\u3081\u3066\u826f\u597d\u306a\u30af\u30fc\u30ed\u30f3\u52b9\u7387\u3084\u9ad8\u5bb9\u91cf\u304c\u671f\u5f85\u3067\u304d\u308b\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u91d1\u5c5e\u8ca0\u6975\u3092\u5229\u7528\u3057\u305f\u30a2\u30cb\u30aa\u30f3\u4e8c\u6b21\u96fb\u6c60\u306b\u95a2\u3059\u308b\u7814\u7a76\u3092\u884c\u3063\u3066\u3044\u308b\uff08Fig. 3\uff09\u3002\u96fb\u6c60\u6750\u6599\u3068\u3057\u3066\u9b45\u529b\u7684\u306a\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u91d1\u5c5e\u8ca0\u6975\u3092\u7528\u3044\u308b\u70b9\u306b\u3001\u3053\u306e\u96fb\u6c60\u7cfb\u306e\u7279\u5fb4\u304c\u3042\u308b\u306e\u306f\u3082\u3061\u308d\u3093\u306e\u3053\u3068\u3001\u6c4e\u7528\u5143\u7d20\u306e\u307f\u3067\u69cb\u6210\u3055\u308c\u305f\u96fb\u6c60\u4e3b\u8981\u90e8\u6750\u304c\u5229\u7528\u3067\u304d\u308b\u30e1\u30ea\u30c3\u30c8\u3082\u5927\u304d\u3044\u3002\u4f4e\u70ad\u7d20\u5316\u793e\u4f1a\u3092\u9054\u6210\u3059\u308b\u306b\u306f\u3001\u81ea\u7136\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u4f7f\u3063\u3066\u5f97\u3089\u308c\u305f\u96fb\u6c17\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u30b7\u30fc\u30e0\u30ec\u30b9\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u306e\u96fb\u529b\u5e73\u6e96\u5316\u7528\u84c4\u96fb\u6c60\u30b7\u30b9\u30c6\u30e0\u306e\u5c0e\u5165\u304c\u5fc5\u9808\u3067\u3042\u308b\u3002Al\u91d1\u5c5e\u8ca0\u6975\u30a2\u30cb\u30aa\u30f3\u96fb\u6c60\u306f\u6c4e\u7528\u5143\u7d20\u3060\u3051\u3067\u4f5c\u88fd\u3067\u304d\u3001\u5927\u91cf\u751f\u7523\u306b\u5bfe\u3059\u308b\u969c\u58c1\u304c\u5c0f\u3055\u3044\u305f\u3081\u3001\u305d\u306e\u91cd\u8981\u306a\u5f79\u5272\u3092\u62c5\u3046\u53ef\u80fd\u6027\u3092\u79d8\u3081\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

Aluminum Metal Anode Anion-Secondary Battery<\/strong><\/h3>\n\n\n\n

Due to the rapid transition to a ubiquitous society and a low-carbon society, expectations for storage batteries continue to rise, and the scope of their application continues to expand. However, some of the elements that make up secondary batteries have concerns about the amount of resources available, so it is important to design and create secondary batteries from the perspective of resource, instead of simply pursuing battery performance as in the past. For example, as secondary batteries to replace lithium-ion batteries, battery systems using sodium ions and potassium ions, which are alkali metal ions similar to lithium ions, have been proposed and are being used as alternative batteries. Recent years, research on battery systems using high-capacity common polyvalent metals, e.g., magnesium (3833 mAh cm-3<\/sup>, 2205 mAh g-1<\/sup>), zinc (5854 mAh cm-3<\/sup>, 820 mAh g-1<\/sup>) and aluminum (8046 mAh cm-3<\/sup>, 2980 mAh g-1<\/sup>), for the anode is also active (Values in parentheses indicate theoretical volume capacity (mAh cm-3<\/sup>) and theoretical weight capacity (mAh g-1<\/sup>). Cf. Lithium is 2066 mAh cm-3<\/sup>, 3862 mAh g-1<\/sup>.). Comparing the theoretical volume capacities, the three polyvalent metals mentioned above are larger than lithium. It is fully assumed that batteries using these metal negative electrodes will be advantageous when batteries must be arranged in a limited space.<\/p>\n\n\n\n

The main components that make up a battery are an anode, a cathode, and an electrolyte. A wide variety of elements are used for these, and it is unexpectedly difficult to construct a secondary battery system using only general-purpose elements. We are conducting research on anion secondary batteries using aluminum metal anodes, which are abundant resources and are expected to have extremely good coulombic efficiency and high capacity (Fig. 3). The most distinctive feature of this battery system is the use of an attractive aluminum metal negative electrode as a battery material. Besides, it should not be forgotten that the main components of the battery can be made only of common elements. In order to achieve a low-carbon society, it is essential to introduce a secondary battery system for power leveling that enables continuous use of electrical energy obtained using natural energy. Since Al metal anode anion-secondary batteries can be fabricated using only general-purpose elements and the barriers to mass production are small, they have the potential to play an important role.<\/p>\n\n\n\n

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<\/div>\n<\/div>\n\n\n\n

Fig. 3 Typical examples of Al metal anode anion-secondary battery.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u6211\u3005\u306e\u7814\u7a76\u5ba4\u3067\u306f\u3001\u30a4\u30aa\u30f3\u6db2\u4f53\u3001\u96fb\u6c17\u5316\u5b66\u3001\u6750\u6599\u79d1\u5b66\u3092\u57fa\u76e4\u3068\u3057\u305f\u7814\u7a76\u3092\u884c\u3044\u3001SDGs\u306e\u9054\u6210\u306b\u8ca2\u732e\u3067\u304d\u308b\u69d8\u3005\u306a\u30a8\u30cd\u30eb\u30ae\u30fc\u6750\u6599\u3001\u84c4\u96fb\u30c7\u30d0\u30a4\u30b9\u3001\u8cc7\u6e90\u5faa\u74b0\u30d7\u30ed\u30bb\u30b9\u3001\u5206\u6790\u6280\u8853\u306e\u958b\u767a\u306b\u53d6\u308a\u7d44\u3093\u3067\u3044\u307e\u3059\u3002 Our laboratory c […]<\/p>\n","protected":false},"author":1,"featured_media":354,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":"","_wp_rev_ctl_limit":""},"class_list":["post-16","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.tp.chiba-u.jp\/tsuda_lab\/wp-json\/wp\/v2\/pages\/16","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tp.chiba-u.jp\/tsuda_lab\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.tp.chiba-u.jp\/tsuda_lab\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.tp.chiba-u.jp\/tsuda_lab\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tp.chiba-u.jp\/tsuda_lab\/wp-json\/wp\/v2\/comments?post=16"}],"version-history":[{"count":3,"href":"https:\/\/www.tp.chiba-u.jp\/tsuda_lab\/wp-json\/wp\/v2\/pages\/16\/revisions"}],"predecessor-version":[{"id":450,"href":"https:\/\/www.tp.chiba-u.jp\/tsuda_lab\/wp-json\/wp\/v2\/pages\/16\/revisions\/450"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tp.chiba-u.jp\/tsuda_lab\/wp-json\/wp\/v2\/media\/354"}],"wp:attachment":[{"href":"https:\/\/www.tp.chiba-u.jp\/tsuda_lab\/wp-json\/wp\/v2\/media?parent=16"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}