Lithium battery material and preparation method thereof

Abstract

The invention discloses a lithium battery material and a preparation method thereof. The material is prepared from the following raw materials in parts by weight: 30 to 40 parts of nano silicon aerogel, 40 to 60 parts of graphene flat straight sheets, 10 to 20 parts of conductive carbon black, 10 to 15 parts of lithium titanate powder, 1 to 3 parts of elastic silicone acrylic emulsion and 5 to 9 parts of perfluoroalkyl acrylate copolymer emulsion. The nano silicon aerogel is used; after the compounding, the gap between the metal particles and graphene flat straight sheets can be greatly increased, so that lithium ions can easily migrate and pass in the gaps; the embedment and the disengagement in the process are convenient; the charging and discharging specific capacity of the lithium battery is greatly improved; meanwhile, the obtained material has excellent toughness, anti-corrosion performance and conduction performance.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a lithium battery material and a preparation method thereof. Background technique [0002] As a new generation of green high-energy rechargeable batteries, lithium-ion batteries have the characteristics of high voltage, high energy density, small self-discharge, and good cycle performance, and occupy a dominant position in many electrical appliances. Some small electric tools need to be charged and discharged at a high rate. The frequency of daily use is high, and the cycle can be used more than 10 times. If the service life of the electrical appliance is required to reach one year, the cycle life of the battery must reach about 3,000 times. Although the lithium-ion battery cycle The life performance is good. If the bonding strength of the negative electrode does not meet the requirements, the peeling degree of the coating will increase with the increase of the number of cycle...

AI Technical Summary

Problems solved by technology

In order to reduce the internal resistance of the battery in the traditional process, there is generally no active material in the contact part of the negative plate and the battery case during the assembly process, so that the copper foil current collector is in direct contact with the inner wall of the battery case. When the battery is charging, the potential of the negative electrode decreases and the electrolyte A reduction reaction will inevitably occur on the exposed surface of the copper foil current collector to generate gas, and the battery will swell, causing the positive and negative electrodes to be separated from the separator and affecting the battery life.