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    • 5. 发明申请
    • NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
    • 非电解电解质二次电池
    • US20120009452A1
    • 2012-01-12
    • US13257675
    • 2010-07-20
    • Atsushi Ueda
    • Atsushi Ueda
    • H01M4/131H01M10/36
    • H01M4/5825H01M4/13H01M4/587H01M4/625H01M10/0525
    • Disclosed is a nonaqueous electrolyte secondary battery wherein the energy density is improved by increasing the range of depth of discharge to be used. Specifically disclosed is a lithium ion secondary battery 20 wherein an electrode group 6 is contained within a battery case 7. The electrode group 6 is formed by winding a positive electrode plate W1 and a negative electrode plate W3 with a separator W5 interposed therebetween. The positive electrode plate W1 has positive-electrode mixture layers W2 which are formed on both surfaces of an aluminum foil and contain a positive-electrode active material. The positive-electrode active material contains lithium iron phosphate as a principal component. The negative electrode plate W3 has negative-electrode mixture layers W4 which are formed on both surfaces of a rolled copper foil and contain a negative-electrode active material. The negative-electrode active material contains a mixture of a graphite material as a principal component and an amorphous carbon material as a secondary component. The positive electrode plate W1 has a positive-electrode initial charge/discharge efficiency of e1, the negative electrode plate W3 has a negative-electrode initial charge/discharge efficiency of e2, and e1 and e2 satisfy the relation of formula e2=e1−x (10≦x≦20). This avoids usage of the high resistance region of the positive electrode plate W1.
    • 公开了一种非水电解质二次电池,其中通过增加使用的放电深度的范围来改善能量密度。 具体公开了一种锂离子二次电池20,其中电极组6包含在电池壳体7内。电极组6通过将隔板W5夹在其间的正极板W1和负极板W3卷绕而形成。 正极板W1具有形成在铝箔的两面并且含有正极活性物质的正极复合层W2。 正极活性物质含有磷酸铁锂作为主要成分。 负极板W3具有负极混合层W4,它们形成在轧制的铜箔的两个表面上并含有负极活性材料。 负极活性物质含有作为主要成分的石墨材料和作为次要成分的无定形碳材料的混合物。 正极板W1具有e1的正极初始充放电效率,负极板W3具有e2的负极初始充放电效率,e1和e2满足公式e2 = e1-x的关系 (10≦̸ x&nl; 20)。 这避免了正极板W1的高电阻区域的使用。