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    • 88. 发明授权
    • Secondary battery
    • 二次电池
    • US09553310B2
    • 2017-01-24
    • US13879105
    • 2010-10-15
    • Hiroki Nagai
    • Hiroki Nagai
    • H01M4/485H01M4/131H01M4/1391H01M4/02
    • H01M4/485H01M4/131H01M4/1391H01M2004/021H01M2220/20Y02E60/122
    • A secondary battery according to the present invention has a current collector and a positive electrode mixture layer that coats the current collector. The positive electrode mixture layer includes a positive electrode active material, an electrically conductive material, and a binder, and the positive electrode active material is constituted by hollow-structure secondary particles formed by the aggregation of a plurality of primary particles of a lithium transition metal oxide and has a through hole penetrating from outside to a hollow portion. In addition, a particle porosity A1 of the positive electrode active material satisfies 2.0(%)≦A1≦70(%). Furthermore, a DBP absorption A2 of the positive electrode active material satisfies 23 (mL/100 g)≦A2. Moreover, the tap density A3 of the positive electrode active material satisfies 1.0 (g/mL)≦A3≦1.9 (g/mL).
    • 根据本发明的二次电池具有集流体和涂覆集电体的正极合剂层。 正极合剂层包括正极活性物质,导电材料和粘合剂,正极活性物质由中空结构的二次粒子构成,所述中空结构的二次粒子是由多个一次以上的锂过渡金属 并且具有从外部贯穿到中空部的通孔。 另外,正极活性物质的颗粒孔隙率A1满足2.0(%)≤Al≤70(%)。 此外,正极活性物质的DBP吸收A2满足23(mL / 100g)≤A2。 此外,正极活性物质的振实密度A3满足1.0(g / mL)≤A3≤1.9(g / mL)。
    • 90. 发明授权
    • Secondary battery
    • 二次电池
    • US09225008B2
    • 2015-12-29
    • US13879132
    • 2010-10-15
    • Hiroki NagaiMasahiro MoritaTakashi Iwao
    • Hiroki NagaiMasahiro MoritaTakashi Iwao
    • H01M4/131H01M10/00H01M4/1391H01M4/505H01M4/525H01M4/02
    • H01M4/131H01M4/1391H01M4/505H01M4/525H01M10/00H01M2004/021H01M2220/20Y02E60/122Y10T29/49108
    • A porosity X of a positive electrode mixture layer 223 of a secondary battery 100 is 30(%)≦X. A mass ratio α of a positive electrode active material 610 in the positive electrode mixture layer 223 is 0.84≦α≦0.925 and a mass ratio β of a conductive material 620 in the positive electrode mixture layer 223 is 0.06≦β≦0.12. In the secondary battery 100, an index Y worked out from an expression below is 30 (mL/100 g)≦Y≦89 (mL/100 g). The index Y is given by the expression below, Y=A×α+B×β; where A is a DBP absorption number (mL/100 g) in the positive electrode active material 610; α is the mass ratio of the positive electrode active material 610 in the positive electrode mixture layer 223; B is a DBP absorption number (mL/100 g) of the conductive material 620; and β is the mass ratio of the conductive material 620 in the positive electrode mixture layer 223.
    • 二次电池100的正极合剂层223的孔隙率X为30(%)×nlE; X。 正极合剂层223中的正极活性物质610的质量比α为0.84< 1;α≦̸ 0.925,质量比&bgr; 正电极混合物层223中的导电材料620的电阻率为0.06< nlE;& nlE; 0.12。 在二次电池100中,从以下表达式得出的指数Y为30(mL / 100g)≦̸ Y< ll; 89(mL / 100g)。 指标Y由下式给出:Y = A×α+ B×&bgr; 其中A是正极活性物质610中的DBP吸收值(mL / 100g) α是正极合剂层223中的正极活性物质610的质量比; B是导电材料620的DBP吸收数(mL / 100g) 和&bgr 是正极合剂层223中的导电材料620的质量比。