Preparation method of high-first-effect small-particle single-crystal ultrahigh-nickel ternary positive electrode material

By coating Li2WO4 onto the surface of ultra-high nickel ternary cathode material and incorporating W, combined with mechanical pressing and four-stage calcination technology, the problems of lithium-nickel mixing, particle size, and first-efficiency were solved, and high-performance small-particle single-crystal materials were prepared, which are suitable for new energy vehicles and energy storage systems.

CN121451273AActive Publication Date: 2026-02-03HEFEI UNIV OF TECH +1
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Patent Information

Application Number
CN202610003268.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-05
Publication Date
2026-02-03
Estimated Expiration
2046-01-05

AI Technical Summary

Technical Problem

Existing ultra-high nickel ternary cathode materials suffer from severe lithium-nickel mixing, excessively large single-crystal particle size, low initial coulombic efficiency, and insufficient cycle stability, making it difficult to meet the high power output requirements of fast charging and energy storage systems for new energy vehicles.

Method used

By coating the surface of lithium nickel cobalt manganese oxide material with a Li2WO4 layer, incorporating some W elements into the bulk phase of the material, and combining mechanical pressing to form a dense precursor with four-stage programmed temperature-controlled calcination, lithium-nickel mixing is suppressed, structural stability and initial coulombic efficiency are improved, single crystal particle size is controlled, and lithium-ion transport paths are optimized.

Benefits of technology

A single-crystal ultra-high nickel ternary cathode material with small particles, high initial efficiency, and excellent cycle stability was prepared, which improved the electrochemical performance of the material and made it suitable for liquid and solid-state battery systems, meeting the needs of high energy density and long life batteries.

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and discloses a preparation method of a high-first-effect small-particle single-crystal ultrahigh-nickel ternary positive electrode material. The method comprises the following steps: firstly, uniformly mixing an ultrahigh nickel ternary precursor with a lithium source and a tungsten source, performing mechanical densification and pressing to obtain a blocky solid, and then performing four-section program temperature control calcination to obtain a target material. The interface fusion resistance of single crystal growth can be reduced through mechanical densification; a part of the tungsten element forms a Li2WO4 coating layer, and a part of the dopant phase replaces Ni < 2 + >, so that grain growth can be inhibited, a crystal structure can be stabilized, and the first effect is improved; and the microstructure of the material can be accurately regulated and controlled through four-section temperature-controlled calcination. Through a coating-doping-single crystallization synergistic strategy, the electrochemical performance of the material in liquid and sulfide-based all-solid-state batteries is remarkably improved, the process is controllable, and the application prospect is wide.
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