Lithium ion battery anode pole piece

Abstract

The invention belongs to the technical field of lithium ion batteries and in particular relates to a lithium ion battery anode pole piece comprising a current collector, bottom layer film pieces arranged on the surface of the current collector and top layer film pieces arranged on the surface of the bottom layer film pieces. The bottom layer film pieces and the top layer film pieces all comprise active substances, adhesives and conductive agents. The active substances in the bottom layer film pieces are graphite, and the active substances in the top layer film pieces are at least one of silicon, silicon alloy and tin alloy. Compared with the prior art, in the lithium ion battery anode pole piece, the graphite anode bottom layer film pieces having a buffering action are arranged between the top layer film pieces having large expansion trends and the current collector, a part of the large expansion trends of the top layer film pieces are offset by the bottom layer film pieces so as to solve the problem of expansion demoulding of a silicon anode and an alloy anode in the charging process, and silicon anode and alloy anode materials can be adopted for preparing the batteries to improve the energy density.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to an anode pole piece of a lithium ion battery. Background technique [0002] Since the large-scale commercialization of lithium-ion batteries, they have been widely used in portable electrical appliances such as laptops, cameras, and mobile communications due to their advantages of high energy density and high power density. However, with the continuous updating of consumer electronic products, more and more functions are integrated in the electronic products, and the requirements for the energy density of batteries are also getting higher and higher. [0003] In order to improve the energy density of batteries, some silicon anode materials with high energy density and alloy anode materials have been gradually developed in recent years. Although these two types of anode materials are very effective in increasing the energy density of batteries, their expansion is la...

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Problems solved by technology

[0006] The purpose of the present invention is to: aim at the deficiencies of the prior art, and provide an anode pole piece of a lithium-ion battery, which can solve the problem of silicon anode and alloy anode in the charging process of the battery without affecting the performance of the battery core. The problem of expansion and defilming is easy to occur, so that it is possible to use silicon anode and alloy anode materials to increase the energy density of the battery, so as to overcome the problem of expansion and defilming of silicon anode and alloy anode in the charging process of the battery in the prior art lack of

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