US 2013/0171523 A1Published application

Lithium-ion secondary battery and the cathode material thereof

OwnerZhi CHEN, Ying WANG +6inventors

InventorsZhi CHEN, Ying WANG, Fengguan ZHAO, Zilong YU, Yuansen XIE, Jianxun REN, Jiajai HU, Leimin XU

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Abstract

The present invention relates to the field of lithium-ion battery, and particularly to high-capacity cathode material, and high-energy density lithium-ion secondary battery prepared using the same. The cathode material comprises cathode active material, a binder and a conductive agent, in which the cathode active material is a compound material of lithium cobalt oxide-based active material A and nickel-based active material B pretreated before being mixed, and the mass ratio B/A of the lithium cobalt oxide-based active material A and nickel-based active material B is between 0.82 and 9. The present invention can produce a battery having both larger capacity and higher energy density, and address the problem of gas generation in the battery at high temperature.

Claims10

Dependent claims

A cathode material for lithium-ion secondary battery, comprising cathode active material, a binder, and a conductive agent, wherein the cathode active material is a compound material of

lithium cobalt oxide-based active material A, having a formula of LixCoyMa(1-y)O2, where 0.45≦x≦1.2, 0.8≦y≦1, Ma is one or more of Al, Mn, Fe, Mg, Si, Ti, Zn, Mo, V, Sr, Sn, Sb, W, Ta, Nb, Ge and Ba;
and
nickel-based active material B, having a formula of Lix1NiaCobMb(1-a-b)O2, wherein 0.45≦x1≦1.2, 0.7≦a≦0.9, 0.08≦b≦0.3, 0.78≦a+b≦1, Mb is one ore more of Al, Mn, Mg, Fe, Ti, Zn, Mo, V, Sr, Sn, Sb, W, Ta, Nb, Ge and Ba,
characterized in that the nickel-based active material B is pretreated before being mixed with the lithium cobalt oxide-based active material A, and the mass ratio B/A of the lithium cobalt oxide-based active material A and the nickel-based active material B is between 0.82 and 9.

1 more element

Dependencies are inferred from the claim text.