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    • 9. 发明授权
    • Nonaqueous electrolyte secondary cell and method for charging same
    • 非水电解质二次电池及其充电方法
    • US07438991B2
    • 2008-10-21
    • US11288355
    • 2005-11-29
    • Nobumichi NishidaHidetoshi Inoue
    • Nobumichi NishidaHidetoshi Inoue
    • H01M4/48
    • H01M10/0569H01M4/366H01M4/505H01M4/525H01M10/0525H01M2010/4292
    • The invention provides a non-aqueous electrolyte secondary cell that has high capacity and excels in cycle characteristics. The non-aqueous electrolyte secondary cell functions stably at a high potential of from 4.4 to 4.6 V with respect to lithium and inhibits the decomposition of the electrolytic solution at high potential. This is accomplished as follows. The non-aqueous electrolyte secondary cell has a positive electrode having a positive electrode active material; a negative electrode having a negative electrode active material; and a non-aqueous electrolyte having a non-aqueous solvent and electrolytic salt. The positive electrode active material has: lithium cobalt compound oxide having added therein at least zirconium and magnesium; and lithium-nickel-manganese compound oxide having a layered structure. The positive electrode active material has a potential of from 4.4 to 4.6 V with respect to lithium. The non-aqueous solvent contains diethyl carbonate of 10 vol. % or higher at 25° C.
    • 本发明提供一种具有高容量且循环特性优异的非水电解质二次电池。 该非水电解质二次电池在相对于锂的4.4〜4.6V的高电位下稳定地发挥作用,并且抑制电解液在高电位下的分解。 这是完成如下。 非水电解质二次电池具有正极,具有正极活性物质; 负极,具有负极活性物质; 和具有非水溶剂和电解质盐的非水电解质。 正极活性物质具有至少添加有锆和镁的锂钴复合氧化物; 和具有层状结构的锂镍锰复合氧化物。 正极活性物质相对于锂具有4.4〜4.6V的电位。 非水溶剂含有10体积%的碳酸二乙酯。 25℃以下%以上