Negative electrode material and preparation method thereof, negative electrode plate and lithium ion battery

Abstract

The invention discloses a negative electrode material of a lithium ion battery. The negative electrode material comprises the following components in parts by mass: 88-105 parts of active material, 0.01-0.1 parts of single-wall carbon nanotubes, 0.01-0.5 parts of graphene nanobelt, one or less parts of super conductive carbon black, one or less parts of less-wall or multi-wall carbon nanotubes, 0.05-0.5 parts of dispersing agent, 1-3 parts of thickening agent, 1-4 parts of binder and 25-60 parts of solvent; the active material comprises a silicon oxide material SiO<x> and synthetic graphite, wherein x is greater than 0 and less than 2; and the silicon element in the negative electrode material is less than or equal to 3.5mass%. The invention provides the negative electrode material comprising the silicon oxide material and the low-dimensional carbon conductive material of the lithium ion battery; by virtue of the negative electrode material of the lithium ion battery, the problems of capacity fading and increasing internal resistance caused by losing of effective electron channels due to low electrical conductivity and an expansion effect in the use process of a silicon oxide negative electrode active material can be solved; and meanwhile, the cycle performance of the lithium ion battery applying the negative electrode material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a negative electrode material for lithium ion batteries and a preparation method thereof, and also relates to a negative electrode sheet containing the above negative electrode material and a lithium ion battery using the negative electrode sheet. Background technique [0002] The energy used by humans mainly comes from fossil energy. However, with the depletion of fossil energy and the pollution of the environment caused by the burning of fossil energy, for the sustainable development of human beings, a low-carbon, environmentally friendly and sustainable development strategy is proposed. Low-carbon environmental protection, green energy and sustainable development are important issues in today's world, especially the development and reuse of clean energy is inseparable from human survival and development. Since the commercialization of lithium-ion batt...

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Problems solved by technology

[0007] In order to solve the deficiencies of the prior art, the invention provides a negative electrode material for lithium ion batteries that contains silicon-oxygen materials and low-dimensional carbon conductive materials. The problem of low efficiency and the loss of effective electronic channels due to expansion during use, the capacity fading and the increase of internal resistance, and at the same time improve the cycle performance of lithium-ion batteries using this negative electrode material

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