COMPOSITE NEGATIVE ELECTRODE ACTIVE MATERIAL AND PREPARATION METHOD THEREFOR, NEGATIVE ELECTRODE PLATE COMPRISING SAME, SECONDARY BATTERY, AND POWER CONSUMING DEVICE

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.