Carbon-coated ternary positive electrode material and preparation method thereof

Abstract

The invention discloses a carbon-coated ternary positive electrode material which comprises a ternary positive electrode material, the ternary positive electrode material is LinNi1-x-yCoxMnyO2, x is more than 0 and less than 0.5, y is more than 0 and less than 0.5, and n is more than 0.9 and less than 1.5; the invention also provides a preparation method of the carbon-coated ternary positive electrode material, the method can improve the electronic conductivity of the carbon-coated layer, and the material shows excellent electrochemical performance when being used as the positive electrode material of the lithium ion battery; the carbon material has the advantages of excellent electrical conductivity, ultrahigh chemical and electrochemical stability, unique physical properties, low cost and the like, the problem of poor electrical conductivity of the carbon-coated lithium ion positive electrode material can be improved by adopting the carbon-coated lithium ion positive electrode material, the electrical conductivity of the carbon material can be effectively improved, and the electrical conductivity of the carbon-coated ternary positive electrode material is further improved; and furthermore, the electrochemical performance of the positive electrode material is improved.

Description

technical field [0001] The invention belongs to the technical field of carbon-coated ternary cathode materials, and more specifically relates to a carbon-coated ternary cathode material and a method for preparing the carbon-coated ternary cathode material. Background technique [0002] At present, as a green new energy product, lithium-ion batteries have very important and broad application prospects. The positive electrode material determines the energy density, service life and safety performance of lithium-ion batteries. Therefore, cathode materials play an important role in lithium-ion batteries. Moreover, the electrochemical performance of the positive electrode material can be effectively improved by coating the carbon layer on the surface of the positive electrode material, and finally the performance of the lithium ion battery can be improved. [0003] Existing chemical vapor deposition method is used to prepare carbon-coated ternary cathode materials. However, in...

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Problems solved by technology

However, in the preparation process of chemical vapor deposition, the deposition temperature is usually high, and the excessively high deposition temperature will cause redox reaction of the carbon-coated ternary positive electrode material, and then generate impurity phases, which will eventually affect the electrochemical performance of lithium-ion batteries.