Contemporary Amperex Technology (hong Kong) Limited

Wenlong Bai

Kai Wu

Baozhen Wu

Yuwen Wang

Xingyan You

Wei Zheng

Yiyang Wu

The present application provides a composite negative electrode active material and a preparation method therefor, a negative electrode plate comprising same, a secondary battery and a power consuming device. The composite negative electrode active material comprises a negative electrode active material substrate and a conductive polymer layer on the surface of the negative electrode active material substrate, wherein the cyclic voltammetry curve of the composite negative electrode active material has an oxidation peak within a range of 3.2 V-3.6 V and a reduction peak within a range of 2.1 V-2.6 V. The composite negative electrode active material provided by the present application can combine a low volume expansion, a high capacity per gram and a high initial coulombic efficiency, thus enabling a secondary battery to combine a low volume expansion, a high energy density and a long cycle life.

Composite negative electrode active material and preparation method therefor, negative electrode plate comprising same, secondary battery, and power consuming device

A negative electrode plate and an electrode assembly, a battery cell, a battery, and an electric apparatus containing the same are provided. The negative electrode plate () includes: a negative electrode current collector, having a first surface (a) and a second surface (b) opposite each other in a thickness direction of the negative electrode current collector; a first negative electrode film layer located on the first surface side, the first negative electrode film layer including first silicon-based negative electrode active material particles; and a second negative electrode film layer located on the second surface side, the second negative electrode film layer including second silicon-based negative electrode active material particles; where a capacity Cper unit area of the first negative electrode film layer and a capacity Cper unit area of the second negative electrode film layer satisfy: 0.005 mAh/mm≤C<C≤0.2 mAh/mm.

Assembly, battery cell, battery, and electric apparatus containing same

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Ningde, China

Wenlong Bai