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    • 7. 发明公开
    • POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, MANUFACTURING METHOD THEREFOR, AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    • POSITIVELEKTRODENAKTIVMATERIALFÜREINELITHIUMSEKUNDÄRBATTERIE,HERSTELLUNGSVERFAHRENDAFÜRUNDLITHIUMSEKUNDÄRBATTERIEDAMIT
    • EP3203556A4
    • 2017-08-09
    • EP15847484
    • 2015-10-02
    • LG CHEMICAL LTD
    • RYU JI HOONJO CHI HOKANG MIN SUKSHIN SUN SIKJUNG WANG MO
    • H01M4/525H01M4/02H01M4/36H01M4/62H01M10/052
    • H01M4/131C01G51/00H01M4/362H01M4/366H01M4/483H01M4/502H01M4/523H01M4/525H01M4/62H01M10/052H01M10/0525H01M2004/021H01M2004/028H01M2220/20Y02E60/122
    • The present invention provides a positive electrode active material for a lithium secondary battery including a core including first lithium cobalt oxide, and a surface modifying layer positioned on a surface of the core. The surface modifying layer includes a lithium compound discontinuously distributed on the surface of the core, and second lithium cobalt oxide distributed while making a contact with or adjacent to the lithium compound, with a Li/Co molar ratio of less than 1. The lithium compound includes at least one lithium reactive element selected from the group consisting of Ti, W, Zr, Mn, Mg, P, Ni, Al, Sn, V, Cr, and Mo. The positive electrode active material according to the present invention forms a lithium deficient structure in the positive electrode active material of lithium cobalt oxide and changes two-dimensional lithium transport path into three-dimensional path. The transport rate of lithium ions may increase when applied to a battery, thereby illustrating improved capacity and rate characteristic without decreasing initial capacity. As a result, the positive electrode active material may be useful as a positive electrode active material of a battery for a high voltage with 4.4 V or more.
    • 本发明提供一种用于锂二次电池的正极活性材料,所述锂二次电池包含:包含第一锂钴氧化物的核和位于所述核的表面上的表面改性层。 表面改性层包括不连续地分布在核表面上的锂化合物和以Li / Co摩尔比小于1的方式与锂化合物接触或邻近地分布的第二锂钴氧化物。锂化合物 包括选自由Ti,W,Zr,Mn,Mg,P,Ni,Al,Sn,V,Cr和Mo组成的组中的至少一种锂反应性元素。根据本发明的正极活性材料形成 锂钴氧化物的正极活性物质中的锂缺乏结构,将二维锂输送路径变为三维路径。 当应用于电池时,锂离子的传输速率可能增加,由此说明改进的容量和速率特性而不降低初始容量。 结果,正极活性材料可用作4.4V或更高的高电压电池的正极活性材料。