Method for manufacturing lithium ion battery cell by using nano silicon material

Abstract

The invention discloses a method for manufacturing a lithium ion battery cell by using a nano silicon material, which belongs to the field of lithium ion batteries, and comprises the following steps: preparing a negative electrode by using a self-made conductive binder; preparing a positive electrode; and winding the positive electrode, the negative electrode and the diaphragm to obtain a pole group, and then putting the pole group into a shell, injecting liquid and sealing to obtain the lithium ion battery cell. According to the invention, through the self-made conductive binder, a spatial three-dimensional polymer network structure is formed on the surfaces of the binder nano silicon particles, so that the silicon negative electrode material has relatively strong mechanical properties, and the stability of the silicon negative electrode material in charging / discharging operation is remarkably improved; the conductive carbon black is uniformly bonded and dispersed in the binder, so that not only can the addition amount of free carbon black in the positive electrode slurry be reduced, but also a three-dimensional conductive network system can be formed, and excellent conductivity can be realized with a small amount, thereby effectively improving the capacity and power of a lithium battery cell.

Description

technical field

[0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for making lithium ion batteries by using nano-silicon materials. Background technique

[0002] Lithium-ion batteries have the advantages of high energy, long service life, high power tolerance, low self-discharge ratio, light weight, and environmental protection. They are widely used in various fields; at present, lithium batteries are widely used in digital products, power tools. , electric bicycles and electric vehicles, their energy density is increasing with the advancement of various material technologies and processes. The battery cell is the core part of the lithium-ion battery, which is divided into three types: aluminum shell battery, soft-pack battery (also known as polymer battery), and cylindrical battery. The structure of the lithium ion cell is mainly divided into five parts, namely the positive and negative pole pieces, the separator, the...

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