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    • 4. 发明申请
    • CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY
    • 用于锂二次电池的阴极活性材料
    • WO2010117237A9
    • 2011-03-10
    • PCT/KR2010002202
    • 2010-04-09
    • LG CHEMICAL LTDCHANG SUNG KYUNPARK HONG-KYUKIL HYO-SHIKLIM JIN-HYUNG
    • CHANG SUNG KYUNPARK HONG-KYUKIL HYO-SHIKLIM JIN-HYUNG
    • H01M4/48H01M4/02H01M10/36
    • H01M4/505C01G53/04C01P2002/72C01P2006/40H01M4/525
    • The present invention relates to a cathode active material for lithium secondary battery, which is a lithium transition metal oxide of a-NaFeO2 layered crystal structure, wherein the transition metal includes mixed transition metals of Ni and Mn. The cathode active material satisfies the conditions that the average oxidation number of total transition metals except for lithium is greater than +3, and m(Ni) = m(Mn), wherein m(Ni) and m(Mn) stand for mole of manganese and nickel respectively. Contrary to the prior art, the cathode active material adjusts the oxidation state of transition metals to greater than +3, and thus forms a more uniform and stable layered structure, wherein the transition metals are in the transition metal oxide layer and form layered structure. Accordingly, the overall electrochemical properties including the battery capacity can be improved and especially, the high charge and discharge rate property is excellent.
    • 锂二次电池用正极活性物质技术领域本发明涉及作为α-NaFeO 2层状结晶结构的锂过渡金属氧化物的锂二次电池用正极活性物质,其中,过渡金属包含Ni和Mn的混合过渡金属。 所述正极活性物质满足如下条件:除锂以外的全部过渡金属的平均氧化数大于+ 3,并且m(Ni)= m(Mn),其中m(Ni)和m(Mn) 锰和镍。 与现有技术相反,阴极活性材料将过渡金属的氧化态调节为大于+3,因此形成更均匀和稳定的层状结构,其中过渡金属在过渡金属氧化物层中并形成分层结构。 因此,可以改善包括电池容量的整体电化学性能,特别是高充放电速率性能优异。