Carbon coated lithium ion battery electrode material and preparation method thereof

Abstract

The invention discloses a carbon coated lithium ion battery electrode material and a preparation method thereof. The preparation method comprises the following steps: dispersing a lithium ion batterypositive electrode material or a lithium ion battery negative electrode material and a precursor rich in terminal alkynyl groups in a dispersant to obtain a slurry, and performing heat treatment on the slurry in a gas atmosphere or a vacuum environment to obtain the carbon coated lithium ion battery electrode material. The method realizes the full carbon coating of the lithium ion battery positiveelectrode material and the lithium ion battery negative electrode material, effectively improves the surface interface structural stability, the electrical conductivity, the secondary structure stability, the low temperature performances, the fast charging performance and the safety performance of the of the lithium ion battery electrode materials, solves the problems of the energy density, the cycle and the safety of the battery of the electrode materials at the electrode material coating level, and reduces the design and development cost of a battery system and a battery management system.

Description

technical field [0001] The invention relates to a carbon-coated lithium-ion battery electrode material and a preparation method thereof, belonging to the field of lithium-ion battery electrode materials. Background technique [0002] In recent years, the application range of lithium-ion batteries has been expanding, from small consumer electronics products to large new energy vehicles and energy storage power stations. Although lithium-ion batteries can meet the requirements of many consumers, at the same time, consumers have higher and higher requirements for lithium-ion batteries, including energy density, fast charge and fast discharge performance, safety performance, and long cycle life of lithium-ion batteries. Wait. These requirements pose serious challenges to the design of lithium-ion battery systems and electrode materials. [0003] At present, Li-ion battery electrode materials Li 1+α Ni x m y M' z o 2 (0≤α≤0.2, 0≤x≤1.0, 0≤y≤1.0, 0≤z≤1.0, x+y+z=1) will face ...

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Problems solved by technology

[0003] At present, Li-ion battery electrode materials Li 1+α Ni x m y M' z o 2 (0≤α≤0.2, 0≤x≤1.0, 0≤y≤1.0, 0≤z≤1.0, x+y+z=1) will face structural phase change and transition metal ion dissolution during use , Secondary structure damage, severe high-temperature flatulence, low-temperature performance, low cycle life, and poor safety performance; while high-capacity negative electrode materials (Li, Si, Ge, Sn, etc.) have large volume changes during cycling and poor conductivity. Problems such as poor material cycle stability, these problems also largely limit the further improvement of lithium-ion battery volume energy density, further improvement of safety performance, further optimization of cycle performance, etc., thus seriously restricting the in-depth promotion of lithium-ion batteries and industry-scale development, especially restricting the use of high-energy-density lithium-ion batteries in new energy electric vehicles

At present, the methods used to improve the performance of this type of lithium ion battery electrode materials include polymer coating, oxide coating, fluoride coating, metal ion doping, electrolyte additives, etc., but the current methods to solve the above battery problems are not effective. It is still not ideal, and the above problems can only be alleviated by optimizing the battery system and battery management system, which increases the cost of lithium-ion batteries to a certain extent, which is not conducive to the promotion of lithium-ion batteries

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