A double-coated lithium battery positive electrode material and preparation method thereof

Abstract

The invention provides a double-coated lithium battery positive electrode material and a preparation method thereof. The double-coated lithium battery positive electrode material has a core-shell structure, and the chemical formula of the core material is LiNi x co y mn z o 2 , where x>0.8, y>0, z>0, x+y+z=1; the shell material is composed of two layers, wherein the inner layer is a porous fast ion conductor lithium salt, and the pores of the porous fast ion conductor lithium salt A carbon layer is deposited inside, and the carbon layer is formed by carbonization of a binder; the outer layer is a high-molecular polymer, and the positive electrode material prepared by the present invention has two coating layers on the outside, and the porous fast ion conductor enhances the conductivity, and the high The molecular film can prevent the porous fast ion conductor from corroding and falling off during the cycle, and the addition of the binder not only increases the interlayer bonding force, but also further carbonizes into a carbon layer, making the material have a higher cycle retention rate and better performance. safety performance.

Description

technical field

[0001] The invention relates to the field of lithium ion battery materials, in particular to a double-coated lithium battery positive electrode material and a preparation method thereof. Background technique

[0002] In recent years, the development of the new energy industry is in full swing, providing a variety of solutions to control carbon dioxide emissions and curb global warming. As a solution, electric vehicles equipped with lithium-ion batteries have received extensive attention and strong support from governments around the world. With the wide-scale application of high-energy-density high-nickel materials, some safety hazards have also been exposed.

[0003] With the substantial increase in the nickel content of the material, the H2→H3 phase transition of the material during the charging and discharging process is more serious, and the volume of the unit cell changes suddenly, resulting in microcracks, which cause the electrolyte to corrode the fres...

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