Preparation method of Mg and W co-modified ultra-high nickel binary positive electrode material

The preparation method of Mg and W co-doped ultra-high nickel binary cathode material solves the problems of interface stability and structural deformation of cobalt-free ultra-high nickel cathode material, improves the specific capacity and cycle performance of the material, and is suitable for mass production.

CN122403520APending Publication Date: 2026-07-17JIANGXI UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610526674.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-21
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Cobalt-free ultra-high nickel cathode materials face problems such as poor interface stability, Ni2+ migration blocking Li+ diffusion channels, and capacity decay caused by structural deformation under deep delithiation conditions, and traditional single-element doping has limited improvement effect.

Method used

The preparation method of ultra-high nickel binary cathode material LiMg0.01(NixMny)WzO2, co-doped with Mg and W elements, is adopted. By controlling the reaction conditions and high-temperature solid-state sintering, a synergistic effect is formed to stabilize the crystal structure and suppress Ni migration.

Benefits of technology

It improves the specific capacity, cycle performance, and rate performance of the material, thereby increasing the energy density of lithium-ion batteries. The process is simple and suitable for mass production.

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Abstract

The application relates to a preparation method of Mg and W double-element co-modified ultra-high-nickel binary positive electrode material, in particular to Mg and W double-element co-modified high-nickel binary positive electrode material. 0.01 (Ni x Mn y )W z O2, wherein x the value of x is 0.9-0.95, y the value of y is 0.05-0.1, z the value of z is 0.003-0.006. The method comprises the following steps: (1) preparing a nickel and manganese metal salt aqueous solution, a mixed alkali aqueous solution and a reaction bottom solution; (2) respectively adding the metal salt aqueous solution and the mixed alkali aqueous solution into the bottom solution at a certain flow rate to perform a constant-temperature precipitation reaction in a nitrogen atmosphere; (3) after the precipitation reaction is completed, cooling to room temperature, filtering, washing and drying the precursor; (5) after the dried precursor is mixed with metered lithium salt, magnesium oxide and tungsten trioxide, high-temperature solid-phase reaction is performed in an oxygen atmosphere to obtain the Mg and W double-element co-modified ultra-high-nickel binary positive electrode material. The Mg and W double-element co-modified high-nickel binary positive electrode material prepared by the method has a specific capacity of 179.19 mAh / g after 100 cycles at a 0.5C rate, a capacity retention rate of 93.1% or above, and good cycle and rate performance.
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