A kind of method of replenishing lithium to lithium-ion battery positive plate

Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for replenishing lithium to the positive electrode sheet of a lithium ion battery. In an inert atmosphere, an organic lithium solution is sprayed or dripped on the surface of the positive electrode sheet to make lithium ions in the organic lithium solution It is reduced to metal lithium and embedded in the positive electrode sheet, and then the positive electrode sheet is dried. Compared with the prior art, the present invention realizes "wet lithium replenishment" by spraying or dripping a uniform organic lithium solution on the surface of the positive electrode, thereby effectively avoiding the floating of metal lithium powder in the air during dry lithium replenishment , to ensure production safety, and the whole process is simple and the cost is low. The amount of lithium supplementation can be accurately controlled by the amount of organic lithium solution sprayed or dripped, and the time of spraying or dripping, so as to achieve the purpose of uniform lithium supplementation. Prevent the lithium precipitation and deformation of the positive plate, improve the first efficiency of the battery, and then increase the energy density of the battery. In addition, the invention also discloses another method for replenishing lithium to the positive plate of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for supplementing lithium to positive plates of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages of high voltage, high energy density and long cycle life. However, with the miniaturization of portable electronic devices and the continuous development of long standby time, as well as the use of high-power and high-energy devices such as electric bicycles and electric vehicles, the energy density of lithium-ion batteries as energy storage power sources has been increasingly raised. high demands. [0003] During the first charging process of the battery, due to the formation of the solid electrolyte film (SEI film) on the surface of the negative electrode sheet, part of the lithium migrated from the positive electrode sheet will be consume...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to: aim at the deficiencies of the prior art, and provide a kind of method for replenishing lithium to the positive plate of lithium-ion battery, this method adopts "wet method lithium replenishment", can effectively avoid metal lithium powder in dry method when replenishing lithium Floating in the air ensures production safety, and the whole process is simple, high efficiency, energy saving, and low cost. The amount of lithium supplementation can be adjusted by the amount of organic lithium solution sprayed or dropped, and the time of spraying or dropping Accurate control, in order to achieve the purpose of uniform lithium supplementation, to overcome the shortcomings of the prior art lithium supplementation technology, such as uneven lithium insertion, inability to accurately quantitatively insert lithium, harsh environmental requirements, complicated operation, and not conducive to energy conservation