Lithium ion battery negative electrode for reducing irreversible capacity loss and preparation method of lithium ion battery negative electrode

Abstract

The invention discloses a lithium ion battery negative electrode for reducing irreversible capacity loss. The lithium ion battery negative electrode comprises a negative electrode current collector and a negative electrode paste, wherein the negative electrode paste is coated on the surface of the negative electrode current collector and comprises the following constituents based on mass: 25-45% of negative electrode active substance, 0.3-5% of conductive agent, 0.3-5% of binding agent, 0-2% of surfactant, 0.0001-0.01% of lithium salt and 50-70% of water, and the percentage sum of all constituents is 100%. With the lithium ion battery negative electrode disclosed by the invention, the irreversible capacity loss of the battery can be effectively reduced, and the energy density of the battery is improved. The invention also provides a preparation method of the lithium ion battery negative electrode for reducing the irreversible capacity loss. The process step is simple, and the method is high in operability, is easy to implement, and can be completely applied to industrial production of a lithium ion battery at a large scale.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion batteries, in particular to a lithium ion battery negative electrode capable of reducing irreversible capacity loss and a preparation method thereof. Background technique [0002] At present, in the manufacturing process of lithium-ion batteries, the positive and negative plates are directly assembled together through the separator, and irreversible capacity loss will inevitably occur after liquid injection and activation. [0003] The existing technical solutions regard the irreversible capacity loss of lithium-ion batteries as an inherent property of lithium-ion batteries. By forming an SEI film, part of the capacity of the battery is lost, which increases the irreversible capacity of the first charge and discharge, which seriously affects the battery energy. of full play. At present, a large number of studies have shown that the SEI film formed on the surface of the negative...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the negative electrode of the lithium-ion battery in the prior art will increase the irreversible capacity during the first charge and discharge, which affects the full play of the battery energy, and provides a formula optimization that can effectively reduce the irreversible capacity loss of the battery and improve the battery capacity Reduction of Energy Density and Irreversible Capacity Loss in Li-ion Battery Anodes