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MELILITE COMPOSITE OXIDE

外国特許コード F200010042
整理番号 P2019-544572
掲載日 2020年3月11日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2018JP034073
国際公開番号 WO 2019065285
国際出願日 平成30年9月13日(2018.9.13)
国際公開日 平成31年4月4日(2019.4.4)
優先権データ
  • 特願2017-190808 (2017.9.29) JP
発明の名称 (英語) MELILITE COMPOSITE OXIDE
発明の概要(英語) Provided is a novel compound which can be used for a positive-electrode catalyst of a metal-air battery. The melilite composite oxide according to the present invention is represented by general formula (BazSr1-z)2CoxFe2-2x(SiyGe1-y)1+xO7 (in the formula, 0 ≤ x ≤ 1, 0 ≤ y ≤ 1, and 0 ≤ z ≤ 1, excluding the case where x = 1, y = 1, and z = 0, the case where x = 1, y = 1, and z = 1, the case where x = 1, y = 0, and z = 0, the case where x = 1, y = 0, and z = 1, the case where x = 0, y = 0, and z = 0, and the case where x = 0, y = 0, and z = 1).
従来技術、競合技術の概要(英語) BACKGROUND ART
Of the electric vehicle (EV) further spread, the cruising distance of the gasoline to realize parallel development of high energy density battery is indispensable. Current, the current lithium ion secondary battery exceeds the ' innovation type storage batteries' as one of, a metal-air battery is attracting attention. And a metal-air battery, metal such as zinc as the negative electrode active material, the oxygen in the air as the positive electrode active material refers to a secondary battery. Such metal-air battery, a very high theoretical energy density may be achieved. A metal-air battery, zinc-air battery using zinc as the metal in particular is, research and development in the research institute and overseas long been performed (for example, Non-Patent Document 1, 2), at present, a full-fledged into practical use has not yet been produced.
Incidentally, in the air electrode of a metal-air battery, during discharge of the oxygen reduction reaction (active material) of the hydroxide ion generated by the electronic 4, on the other hand, during charging hydroxide ions and oxygen is generated by the oxidation reaction of the electron 4. These oxygen reduction reaction with the electron transfer 4 (hereinafter, also called 'ORR'.) And the oxygen evolution reaction (hereinafter, also called 'OER'.) Is, in a very slow reaction kinetics from the overvoltage generated when the large charge and discharge, ORR/OER can promote the high activity catalyst is required.
Specifically, a metal-air battery of the charging reaction and discharging reaction at each electrode, the following (1) - (4) equation is as follows. In addition, type (1) - (4) in, for the sake of convenience, the negative electrode using zinc as an example. (Positive) charge reaction (oxygen evolution reaction): 4OH - O2+2H2O+4e -→, (1) discharge reaction (oxygen reduction reaction): O2+2H2O+4e-4OH -→, (negative electrode), (2) the charging reaction: ZnO + H2O + 2e -→Zn+2OH -, (3) the discharge reaction: Zn + 2OH -→ZnO + H2O + 2e -, (4)
Here, in a metal-air electrode, the high-concentration KOH aqueous solution as an electrolytic solution using a strong alkali aqueous solution, the (1) hydroxide ion type, (4) involved in the supply. Then, the positive electrode is immersed in an aqueous solution is strongly alkaline catalyst for, excellent chemical stability are required.
As the positive electrode catalyst, platinum, ruthenium oxide, iridium oxide or the like having the noble metal based catalyst of known ORR/OER activity. However, these noble metal contained in the rare and expensive such as a vehicle battery from a large-scale practical realization is difficult. Therefore, the transition metal or the like, is abundant in resource element as its main component with a general-purpose high-performance positive electrode active ORR/OER has been desired development of a catalyst.
On the other hand in recent years, as the positive electrode catalyst, (ABO3) type transition metal oxide perovskite has been developed. To this, the structure of the perovskite octahedral coordination of six ABO3 the energy level of the B site t2g and when dividing eg, eg the number of electrons becomes maximum in the active ORR/OER 1 have been reported (for example, Non-Patent Document 3, 4). However, such a design guideline, BO6 octahedral coordination compounds other than the perovskite structure, particularly as compared to other metal-oxygen coordination compounds having the structure described has not been considered at all. In particular, in the operating environment of the metal-air battery which is practically usable, useful materials are not yet been found.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • KANAGAWA UNIVERSITY
  • 発明者(英語)
  • OGAWA SATOSHI
  • MOTOHASHI TERUKI
  • SAITO MIWA
  • SUZUKI KENTA
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG

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