To provide a positive electrode active material for a lithium ion secondary battery having favorable cycle characteristics and high capacity.SOLUTION: A covering layer containing aluminum and a covering layer containing magnesium are provided on a superficial portion of the positive electrode active material. The covering layer containing magnesium exists in a region closer to a particle surface than the covering layer containing aluminum is. The covering layer containing aluminum can be formed by a sol-gel method using an aluminum alkoxide. The covering layer containing magnesium can be formed as follows: magnesium and fluorine are mixed as a starting material and then subjected to heating after the sol-gel step, so that magnesium is segregated.SELECTED DRAWING: Figure 1

    【課題】サイクル特性に優れ、高容量なリチウムイオン二次電池用正極活物質を提供する。【解決手段】正極活物質の表層部に、アルミニウムを含む被覆層と、マグネシウムを含む被覆層と、を設ける。マグネシウムを含む被覆層は、アルミニウムを含む被覆層よりも粒子の表面に近い領域に存在する。アルミニウムを含む被覆層は、アルミニウムアルコキシドを用いたゾルゲル法により形成することができる。マグネシウムを含む被覆層は、出発原料にマグネシウムとフッ素を混合しておき、ゾルゲル法の後に加熱を行うことで、マグネシウムを偏析させ形成することができる。【選択図】図1


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    Title :

    LITHIUM ION SECONDARY BATTERY, HYBRID VEHICLE, ELECTRIC VEHICLE, AND PLUG-IN HYBRID VEHICLE


    Additional title:

    リチウムイオン二次電池、ハイブリッド車、電気自動車、及びプラグインハイブリッド車


    Contributors:

    Publication date :

    2020-08-20


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / C01G Verbindungen der von den Unterklassen C01D oder C01F nicht umfassten Metalle , COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F



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