Carbon-coated high-nickel lithium ion battery positive electrode material and preparation method thereof

Abstract

The invention relates to a lithium ion battery, and discloses a carbon-coated high-nickel lithium ion battery positive electrode material and a preparation method thereof. The preparation method comprises the steps of performing grinding and stirring on a high-nickel precursor with a chemical formula of Ni<0.8>Co<0.1>Mn<0.1>(OH)<2>, a lithium source compound and an inorganic oxidizing agent, and then performing pre-heating and then heating, thermal insulating and then cooling to obtain a precursor material; dropwise adding concentrated sulfuric acid to a mixture of graphite, glycerol, diphenolmethane and glacial acetic acid, and performing continuous mixing to obtain a carbon source material; and enabling the precursor material to be added into the carbon source material to be subjected to ultrasonic mixing, and carrying out heating and drying. The battery positive electrode material has relatively high discharge capacity and high cycle performance; in the preparation process, long-time roasting in a carbon source coating condition is not needed, so that material consistency is controlled effectively; and in addition, the preparation raw materials are easily available, the preparation method is simple, and a relatively high popularization and application value is achieved.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a carbon-coated high-nickel lithium ion battery cathode material and a preparation method thereof. Background technique [0002] With the development of the electric vehicle industry, the demand for power lithium-ion batteries continues to increase. However, power lithium-ion batteries have higher requirements on the capacity, safety and cycleability of battery materials. At present, lithium iron phosphate and ordinary ternary lithium-ion battery materials on the market have become increasingly difficult to meet the requirements of power batteries, and it is urgent to develop new lithium-ion battery cathode materials. [0003] High-nickel lithium-ion battery materials have attracted widespread attention due to their high capacity and reasonable price, and are also known as one of the most important cathode materials for next-generation power lithium-ion batteries. However, high-nickel l...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the process of long-time roasting in the presence of carbon source in order to obtain carbon-coated positive electrode materials in the prior art, and overcome the partial reduction of transition metal ions due to super-time roasting that makes the material The consistency is not easy to control, the invention provides a carbon-coated high-nickel lithium-ion battery positive electrode material and its preparation method, the battery positive electrode material has a higher discharge capacity and good cycle performance, during the preparation process It does not need to be roasted for a long time under the condition of carbon source coating, the consistency of the material can be effectively controlled, and the preparation raw materials are easy to obtain, the preparation method is simple, and it has high promotion and application value