Preparation method of lithium-rich anode strip of lithium ion battery

Abstract

The invention belongs to the technical field of lithium ion batteries and especially relates to a preparation method of a lithium-rich anode strip of a lithium ion battery. The preparation method comprises the following steps of 1, coating anode slurry on an anode current collector and drying to obtain an anode strip which comprises an anode diaphragm and needs lithium supplement, and 2, wetting the anode strip needing lithium supplement by an electrolyte until the anode diaphragm is wetted fully, and carrying out dual-channel contact between the anode diaphragm and lithium metal to obtain a lithium-rich anode strip, wherein in contact, a temperature is in a range of 10 to 150 DEG C and pressure intensity is less than 100MPa and contact time is less than 10 hours. Compared with the prior art, the preparation method has the advantages that an ion channel and an electron channel between lithium metal and the anode diaphragm can be formed simultaneously; a potential difference between an anode material and lithium metal can promote fast ionization of lithium metal so that lithium ions are formed; and the formed lithium ions are transferred and embed into anode active substance particles so that fast lithium supplement is realized. The preparation method has simple processes and can realize industrial batch production easily.

Description

Technical field [0001] The present invention belongs to the field of lithium -ion battery technology, which specializes in a preparation method for a lithium -ion battery rich lithium anode. Background technique [0002] In 1991, Sony Corporation creatively adopted carbon materials as lithium -ion battery anode materials, which brought revolutionary changes to the field of lithium -ion battery.Since then, lithium -ion battery technology has developed rapidly, and it has been used in large quantities on mobile phones, cameras, laptops and other portable electrical appliances.Lithium -ion batteries have many advantages, such as high voltage, small volume, light quality, high quality, high ability, no memory effect, pollution -free, small self -discharge and long cycle life, etc., which are the ideal mobile electrical power supply and electric vehicles of the 21st century.Power and power storage stations. [0003] However, with the continuous development of portable electronic equip...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to: address the deficiencies of the prior art, and provide a method for preparing a lithium-rich anode sheet for a lithium-ion battery that has simple process, low cost, and can effectively control the amount and uniformity of lithium supplementation to the anode sheet , using this method can effectively improve the first Coulombic efficiency of the battery cell, thereby greatly improving the energy density of the battery cell, and at the same time can ensure the safety performance and cycle performance of the battery, so as to overcome the disadvantages of the lithium supplementation method in the prior art. Complicated, high cost, unable to effectively control the amount of lithium supplementation, insufficient safety, and may lead to poor cycle performance of the battery