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    • 3. 发明申请
    • POSITIVE ELECTRODE ACTIVE MATERIAL, AND POSITIVE ELECTRODE AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    • 正极电极活性材料,以及包含其的正极和锂二次电池
    • WO2010137889A3
    • 2011-03-31
    • PCT/KR2010003367
    • 2010-05-27
    • LG CHEMICAL LTDHONG SEUNG-TAEKPARK HEY WOONGJEON HO JINPARK SUNG JOONCHOI DAE SIKYUN NAN JIKIM YO JINCHOI SEUNG DON
    • HONG SEUNG-TAEKPARK HEY WOONGJEON HO JINPARK SUNG JOONCHOI DAE SIKYUN NAN JIKIM YO JINCHOI SEUNG DON
    • H01M4/58C01B25/45H01M4/583H01M4/64H01M10/0525
    • H01M4/13H01M4/02H01M4/364H01M4/525H01M4/5825H01M4/661H01M4/70H01M2004/021H01M2010/4292
    • The present invention relates to a positive electrode active material, and to a positive electrode and to a lithium secondary battery comprising same, and more particularly, to a positive electrode active material in which an active material having superior thermal stability is employed and two types of active materials having different particle sizes are used to increase the volume density of the positive electrode active material. The present invention also relates to a positive electrode and to a lithium secondary battery comprising the positive electrode active material. The positive electrode active material of the present invention comprises a small diameter active material having a mean diameter of 0.5 µm and a maximum diameter of 1 µm or smaller, and a large diameter active material having a mean diameter of 5 to 20 µm and a maximum diameter of 100 µm or smaller. The composite positive electrode active material of the present invention is provided with improved packing density as the large diameter active material and the small diameter active material are mixed therein at a predetermined grain size ratio and weight ratio. The composite positive electrode active material of the present invention contains high-stability/high-conductivity materials to achieve improved volume density, discharge capacity, thermal stability and high-rate discharge properties.
    • 本发明涉及正极活性物质,以及与正极和包含该正极的锂二次电池,更具体地说,涉及使用具有优异的热稳定性的活性物质的正极活性物质和两种 使用具有不同粒径的活性物质来增加正极活性物质的体积密度。 本发明还涉及一种正极和包含正极活性物质的锂二次电池。 本发明的正极活性物质包含平均直径为0.5μm,最大直径为1μm以下的小直径活性物质,平均直径为5〜20μm的最大直径的活性物质为最大值 直径为100μm以下。 本发明的复合正极活性物质以规定的粒径比和重量比将大直径活性物质和小直径活性物质混合在一起,具有改善的填充密度。 本发明的复合正极活性物质含有高稳定性/高导电性的材料,以实现体积密度,放电容量,热稳定性和高倍率放电性能的提高。