Method for supplementing lithium to lithium-ion battery positive plate

Abstract

The invention belongs to the technical field of lithium-ion batteries, in particular to a method for supplementing lithium to a lithium-ion battery positive plate. The method includes: spraying or dropwise adding organic lithium solution onto the surface of the positive plate in the inert atmosphere to enable lithium ions in the organic lithium solution to be reduced to metallic lithium, embedding the metallic lithium into the positive plate, and drying the positive plate. Compared with the prior art, the method has the advantages that 'lithium supplement by a wet method' is achieved by spraying or dropwise adding the uniform organic lithium solution on the surface of the negative plate, so that floatation of metallic lithium powder in air is effectively avoided during lithium supplement by a dry method, production safety is guaranteed, the whole process is simple, and cost is low; and amount of supplemented lithium can be accurately controlled by the aid of the amount of the sprayed or dropwise added organic lithium solution and the spraying or dropwise adding time so as to achieve uniform lithium supplement, lithium precipitation and deformation of the negative plate are prevented, initial battery efficiency is improved, and further battery energy density is increased. Besides, the invention further discloses another method for supplementing lithium to a lithium-ion battery positive plate.

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