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    • 6. 发明申请
    • POSITIVE ELECTRODE ACTIVE MATERIAL, METHOD FOR MANUFACTURING POSITIVE ELECTRODE ACTIVE MATERIAL, AND SECONDARY BATTERY
    • 正极活性物质,制造正极活性物质的方法以及二次电池
    • WO2018007908A1
    • 2018-01-11
    • PCT/IB2017/053896
    • 2017-06-29
    • SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    • OCHIAI, TeruakiKAWAKAMI, TakahiroMIKAMI, MayumiMOMMA, YoheiTAKAHASHI, MasahiroTSURUTA, Ayae
    • H01M4/525H01M4/36
    • A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non- stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.
    • 提供了可以改善二次电池的循环特性的正极活性材料。 在具有层状岩盐结晶结构的钴酸锂等正极活性物质的表面部分设置两种区域。 内部区域是含有过渡金属如钛的非化学计量化合物,并且外部区域是代表性元素如氧化镁的化合物。 两种区域均具有岩盐结晶结构。 内层岩盐结晶结构和表层部分的两种区域是topotaxy; 因此能够有效地抑制由充放电产生的正极活性物质的晶体结构的变化。 另外,由于与电解质溶液接触的外涂层是化学稳定的代表性元素的化合物,因此可以获得具有优异循环特性的二次电池。