Contemporary Amperex Technology Co., Ltd.

Xingbu Chen

Xin Sun

Bangrun Wang

Haotian Xie

Xiao Bo Chen

Geng Li

Zhenglun Chen

A secondary battery includes a positive electrode, a negative electrode, and an electrolyte. The positive electrode includes a positive-electrode active substance layer, the positive-electrode active substance layer contains a pre-lithiation agent, and a molecular formula of the pre-lithiation agent is LiNiCuMO, where 1&#x2264;x&#x2264;2, 0&#x3c;a&#x3c;1, and 0&#x2264;b &#x3c;0.1, and M is selected from one or more of Zn, Sn, Mg, Fe, and Mn. The negative electrode includes a negative-electrode active substance layer including graphite and silicon-containing material. The electrolyte contains fluoroethylene carbonate (FEC). A weight percentage of the pre-lithiation agent in the positive-electrode active substance layer, a weight percentage of silicon content in the negative-electrode active substance layer, and a weight percentage of FEC in the electrolyte satisfy 0.2&#xd7;W&#x2264;W&#x2264;7.5%&#x2212;0.6&#xd7;W.

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Ningde, China

Xingbu Chen