Method for removing SEI membrane on surface of metal lithium negative electrode

Abstract

The invention provides a method for removing an SEI membrane on a surface of a metal lithium negative electrode. A lithium manganese button cell which is just packaged is processed, the lithium manganese button cell mainly comprises a negative electrode plate, a positive electrode plate, a diaphragm and an electrolyte; the negative electrode plate is made of lithium or alloy thereof, the positiveelectrode plate takes MnO2 as a positive active material, the diaphragm is arranged between the negative electrode plate and the positive electrode plate, the electrolyte comprises lithium perchlorate, the lithium manganese button cell which is just packaged is placed for 40-50 hours in a static state, and pre-discharging processing is performed, so that the designed capacity of the cell is consumed by 2.5-3.0%. By the method, the problems that the same-type of lithium-MnO2 prepared in the prior art is relatively high in resistance, high in cell capacity consumption and poor in cell performance can be solved.

Description

technical field [0001] The invention belongs to the field of lithium-manganese button battery production, in particular to a method for removing an SEI film on the surface of a metal lithium negative electrode. Background technique [0002] Lithium-manganese dioxide button battery is a kind of energy storage battery developed in the 1970s. Because of its high specific energy, long life, small self-discharge, high cost performance, and no pollution, it has shown great advantages in applications and has been widely used in calculators, electronic watches, car remote keys, communication devices and other products. middle. With the development of electronic information technology, higher requirements are put forward for the performance of batteries in all aspects, and higher and higher requirements are also put forward for the high current performance and capacity of batteries. Generally speaking, the smaller the resistance of the battery, the better the high current performan...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a method for removing the SEI film on the surface of the metal lithium negative electrode, which can solve the problems of relatively high resistance and poor performance of the lithium-manganese dioxide battery of the same type prepared in the prior art

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