A flexible polymer-coated modified ternary positive electrode material, a preparation method and application thereof

By coating the surface of a ternary cathode material with a flexible polymer and using hafnium doping and graphene oxide modification, the problem of microcrack formation under high-temperature cycling was solved, thereby improving the cycling stability and rate performance of the material.

CN116826048BActive Publication Date: 2026-07-21HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEFEI GUOXUAN HIGH TECH POWER ENERGY
Filing Date
2023-06-26
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing lithium nickel cobalt manganese oxide ternary cathode materials suffer from microcrack generation and propagation due to oxygen evolution and inhomogeneity during high-temperature cyclic charge-discharge processes, leading to a decay in the material's electrochemical capacity and failing to meet market demands for high specific capacity and low cost.

Method used

By coating the surface of a ternary cathode material with a flexible polymer and then modifying it with hafnium doping and graphene oxide, a flexible polymer-coated modified ternary cathode material was prepared. This process suppressed the generation and propagation of microcracks and improved the cycle stability and rate performance of the material.

Benefits of technology

It effectively suppressed the generation and propagation of microcracks caused by volume expansion in ultra-high nickel ternary materials under high temperature conditions, thereby improving the cycle stability and rate performance of the battery.

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Abstract

The application discloses a kind of flexible polymer coating modified ternary positive electrode material and its preparation method and application, belong to lithium ion battery technical field.The preparation method of the application includes the following steps: ternary precursor surface is coated with hafnium hydroxide, then mixed with lithium source and is sintered to obtain modified ternary positive electrode material;The modified ternary positive electrode material is reacted with hafnium oxide modified reduced graphene oxide, and the obtained material is reacted with polyisobutylene terephthalate diol and isocyanate to obtain flexible polymer coating modified ternary positive electrode material.The application inhibits the microcrack generation and expansion of ultra-high nickel (Ni content ≥0.90) ternary positive electrode material under high temperature and long cycle through the synergistic effect of flexible polymer coating and hafnium element doping, and improves the electrochemical performance of battery assembled with the material under high temperature conditions.
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