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POSITIVE ELECTRODE ACTIVE MATERIAL FOR MAGNESIUM SECONDARY BATTERY, POSITIVE ELECTRODE FOR MAGNESIUM SECONDARY BATTERY, AND MAGNESIUM SECONDARY BATTERY

Patent code	P170013687
File No.	S2015-1617-N0
Posted date	Feb 2, 2017
Application number	P2015-117810
Publication number	P2017-004770A
Date of filing	Jun 10, 2015
Date of publication of application	Jan 5, 2017
Inventor	(In Japanese)井手本康 (In Japanese)北村尚斗 (In Japanese)石田直哉
Applicant	(In Japanese)学校法人東京理科大学
Title	POSITIVE ELECTRODE ACTIVE MATERIAL FOR MAGNESIUM SECONDARY BATTERY, POSITIVE ELECTRODE FOR MAGNESIUM SECONDARY BATTERY, AND MAGNESIUM SECONDARY BATTERY
Abstract	PROBLEM TO BE SOLVED: To provide a positive electrode active material for a magnesium secondary battery by which the magnesium secondary battery showing satisfactory charge and discharge characteristics can be obtained, a positive electrode for the magnesium secondary battery using the positive electrode active material and a magnesium secondary battery. SOLUTION: A positive electrode active material for a magnesium secondary battery is expressed by a composition formula of a formula (1): Mg_xM1_yM2_zO₂, and consists of magnesium complex oxide having rock-salt type crystal structure of a space group Fm-3 m. In the formula (1), M1 is Ni, Co, or Mn, M2 is different from M1, and at least one kind of element to be selected from a group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, Cu, Nb, W, Mo, and Ru, 0<x≤1, 0<y<2, 0<z<1, and 1.5≤x+y+z≤2.0.
Outline of related art and contending technology	(In Japanese) 近年、蓄電池の用途がモバイル機器から自動車、定置用電源等へと多様化しており、従来のリチウムイオン二次電池に代わる安価で高エネルギー密度を有する次世代二次電池の開発が期待されている。次世代二次電池の中でも特にマグネシウム二次電池は、（i）充放電で二電子反応を利用できるため高容量が期待できる、（ii）負極に使用可能なマグネシウムは安全性に優れていることに加えて電位が比較的低いため、電池の高電圧作動が可能になる、（iii）マグネシウムは産地偏在のリスクが少なく安価である、等の多くの利点があり、研究開発が進みつつある。開発当初、マグネシウム二次電池の正極活物質としては、TiS₂、ZrS₂、RuO₂、Co₃O₄、V₂O₅等が用いられていたが、近年になり様々な結晶構造のマグネシウム複合酸化物が提案されている。例えば、非特許文献1には、マグネシウム二次電池の正極活物質として、岩塩型構造を有するMg_0．67Ni_1．33O₂が開示されている。また、非特許文献2には、岩塩型構造を有するMgNiO₂の合成方法が開示されている。
Field of industrial application	(In Japanese) 本発明は、マグネシウム二次電池用正極活物質、マグネシウム二次電池用正極、及びマグネシウム二次電池に関する。
Scope of claims	(In Japanese) 【請求項1】下記式（1）の組成式で表され、空間群Fm－3mの岩塩型結晶構造を有するマグネシウム複合酸化物からなるマグネシウム二次電池用正極活物質。 Mg_xM1_yM2_zO₂・・・（1）（式（1）中、M1は、Ni、Co、又はMnであり、M2は、M1とは異なり、且つ、Ni、Co、Mn、Ti、V、Cr、Fe、Cu、Nb、W、Mo、及びRuからなる群より選ばれる少なくとも1種の元素であり、0＜x≦1であり、0＜y＜2であり、0＜z＜1であり、1．5≦x＋y＋z≦2．0である。）【請求項2】前記式（1）中のM1が、Niである請求項1に記載のマグネシウム二次電池用正極活物質。【請求項3】前記式（1）中のM2が、Ni、Co、Mn、Ti、V、Cr、Fe、及びCuからなる群より選ばれる少なくとも1種の元素である請求項1又は請求項2に記載のマグネシウム二次電池用正極活物質。【請求項4】前記式（1）中、0＜x≦0．8であり、0．5≦y＜2であり、0＜z≦0．6であり、1．5≦x＋y＋z≦2．0である請求項1～請求項3のいずれか1項に記載のマグネシウム二次電池用正極活物質。【請求項5】請求項1～請求項4のいずれか1項に記載のマグネシウム二次電池用正極活物質を含むマグネシウム二次電池用正極。【請求項6】請求項5に記載のマグネシウム二次電池用正極と、負極と、非水電解液とを有するマグネシウム二次電池。
IPC(International Patent Classification)	H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy H01M 10/0566 Liquid materials H01M 10/054 Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
F-term	5H029AJ02 Charging/discharging characteristics 5H029AK03 Composite oxide (i.e. positive electrode) 5H029AL06 Carbonaceous material (including calcination) (i.e. negative electrode) 5H029AL07 Graphite (i.e. negative electrode) 5H029AL08 Active coal or carbon (i.e. negative electrode) 5H029AL11 Metal or alloy (i.e. negative electrode) 5H029HJ02 Composition formula or composition ratio 5H050AA02 Charge and discharge characteristics 5H050BA15 Non-aqueous type secondary cells 5H050CA08 Mainly composed of Co or nickel oxides (cathodes) 5H050CA09 Mainly composed of Mn oxides (cathodes) 5H050CB07 Carbonaceous materials (including organic calcined materials) (anodes) 5H050CB08 Blackleads (graphites) (anodes) 5H050CB09 Activated carbons or amorphous carbons (CB) (anodes) 5H050CB11 Metals or alloys (anodes) 5H050HA02 Composition formula, composition ratio or molar ratios
State of application right	Published

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Contact Information for " POSITIVE ELECTRODE ACTIVE MATERIAL FOR MAGNESIUM SECONDARY BATTERY, POSITIVE ELECTRODE FOR MAGNESIUM SECONDARY BATTERY, AND MAGNESIUM SECONDARY BATTERY "

Tokyo University of Science University Research Administration Center
URL: https://www.tus.ac.jp/ura/
E-mail:
Address: 1-3 kagurazaka, Shinjuku-ku, Tokyo, Japan , 162-8601
Phone: 81-3-5228-7431
Fax: 03-5228-7442

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	・ (In Japanese) マグネシウム二次電池用新規正極材料の開発(東京理科大学　新技術説明会)

Specification	P2017-004770A
Publication of unexamined applications	P2017-004770A(PDF,246KB)

Applicant	Tokyo University of Science (107) < School organization (7840)
IPC	H01 (1430)
F-term	5H029 (65) 5H050 (75)

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