Pitch carbon coated fluorocarbon cathode material and preparation method thereof

Abstract

The invention discloses a pitch carbon coated fluorocarbon cathode material and a preparation method thereof. The preparation method comprises the following steps: mixing fluorocarbon with pitch, performing heat treatment on the obtained mixture and sieving the mixture to obtain the pitch carbon coated fluorocarbon cathode material. According to the method, fluorocarbon is coated with pitch carbon, and by improving binding force between the fluorocarbon surface and a carbon source, the electric conductivity of the material is improved to a greater extent, so that the discharge voltage plateau, specific capacity and high-current discharge performance of the material are improved substantially. The method has the advantages of low cost, simple equipment, simple and easily controllable process conditions, high yield and the like and is quite suitable for large-scale industrial production.

Description

technical field

[0001] The invention belongs to the technical field of lithium primary battery materials, in particular to a pitch carbon-coated carbon fluoride positive electrode material and a preparation method thereof. Background technique

[0002] As a cathode material for lithium primary batteries, carbon fluoride has the advantages of high specific capacity, wide operating temperature range, high operating voltage, and long storage time, and has become a hot research material to replace manganese dioxide cathode materials. However, the C-F bonds in fluorocarbons exist in the form of covalent bonds, resulting in extremely low conductivity, poor rate performance, and severe heat generation during discharge, which limits their large-scale applications. Therefore, people are devoting themselves to blending and modifying carbon fluoride or coating modification to improve the conductivity of the material and solve the urgent problems such as poor rate performance of carbon ...

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