Lithium-ion battery material surface coating conductive layer and preparation method thereof

Abstract

The invention provides a lithium ion battery material surface coated conducting layer. The surface of the material particles is uniformly coated with a conducting layer through a friction mode. A preparation method of the conducting layer comprises the following steps: 1) natural flake graphite with purity being more than 99.99%, high purity synthetic graphite or various carbon conductive agents are used to prepare a plate-shaped structure; 2) arranging the prepared plate-shaped structure at equipment of a flat-stone mill; 3) adding the material particle of the lithium ion battery through a material port of the flat stone mill; and 4) adjusting a slit between an upper grinding sheet and a lower grinding sheet at the flat stone mill, the pressure of the upper grinding sheet and the lower grinding sheet, and the rotation speed of the upper grinding sheet until the conducting layer thickness coating the surface of the material particle of the lithium ion battery reaches the required thickness. The lithium ion battery material surface coated conducting layer has the advantages that the compacted density of a battery pole piece is increased, the volume specific energy density and the mass specific energy density of the monomer batter are increased, a purpose of rapid charging and discharging can be achieved, and the problems of nonuniform mixing and coiled core expansion due to addition of a conductive agent in the prior art can be solved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a conductive layer coated on the surface of a lithium-ion battery material and a preparation method thereof. Background technique [0002] With the rapid development of electric vehicles and battery energy storage, lithium-ion batteries, as the core technology, have also become a research hotspot. Lithium-ion battery is a new type of new green secondary battery. It has been widely used in various portable electronic products due to its high voltage, high capacity, small size, light weight, long cycle life, good safety performance, and no memory effect. Among them, and will become the main power source of electric vehicles and hybrid vehicles, it is considered to be the most competitive and most promising secondary battery, while the decisive factor for the performance of lithium-ion secondary batteries is the positive electrode material, the working of the b...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a conductive layer coated on the surface of a lithium-ion battery material and a preparation method thereof, which can increase the compaction density of battery pole pieces, thereby increasing the volume specific energy density and mass specific energy density of a single battery, and achieving the purpose of fast charging and discharging , to solve the problem of uneven mixing and core expansion caused by the addition of conductive agents (such as carbon black, acetylene black, etc.) in the existing process

Images