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    • 10. 发明授权
    • Lithium ion secondary battery
    • 锂离子二次电池
    • US08785050B2
    • 2014-07-22
    • US13813458
    • 2010-08-05
    • Takeshi AbeYohei ShindoAkira TsujikoMachiko AbeKeiko Wasada
    • Takeshi AbeYohei ShindoAkira TsujikoMachiko AbeKeiko Wasada
    • H01M4/13
    • H01M4/583C01B32/20C01P2002/82C01P2006/40H01M4/5825H01M4/587H01M10/0525H01M2004/021H01M2220/20Y02E60/122
    • Provided is a lithium-ion secondary battery having an excellent initial capacity as well as a good capacity retention rate. The battery comprises a positive electrode comprising a positive electrode active material, a negative electrode comprising a negative electrode active material, and a non-aqueous liquid electrolyte. The negative electrode active material comprises a graphitic material that satisfies each of the following properties: (a) in its Raman spectrum obtained by Raman scattering analysis using an exciting light at a wavelength of 532 nm, having a ratio of its D-peak intensity ID to its G-peak intensity IG, an R value (ID/IG), of 0.15 or smaller; and (b) having a full width at half maximum of the G peak, ΔvG, of 23 cm−1 or smaller. The secondary battery has a capacity retention rate of 70% or greater when subjected to 500 cycles of charging and discharging at a constant current rate of 2 C at 60° C.
    • 提供了具有优异的初始容量以及良好的容量保持率的锂离子二次电池。 电池包括正电极,其包括正电极活性材料,负极包含负极活性材料和非水电解液。 负极活性物质包含满足以下性质的石墨材料:(a)在使用波长532nm的激发光的拉曼散射分析得到的拉曼光谱中,其D峰强度ID 到其G峰值强度IG,R值(ID / IG)为0.15以下; 和(b)具有G峰的半峰全宽,23cm -1以下的Dgr; vG。 二次电池在60℃下以2℃的恒定电流速率进行500次充放电循环时的容量保持率为70%以上。