High-nickel cathode material rich in rock salt phase on the surface, and a preparation method and application thereof

A positive electrode material, high-nickel technology, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of comprehensive performance of ternary materials, unstable surface chemical properties of materials, poor effect of ternary materials, etc. , to achieve significant cycle performance, great theoretical and practical significance, and broad prospects for commercial application
CN109273688AActive Publication Date: 2019-01-25CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
Publication Date
2019-01-25

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Abstract

The invention discloses a high-nickel cathode material rich in rock salt phase on the surface and a preparation method and application thereof. The high-nickel cathode material comprises LiNi1 doped with high-valence transition metal M; X-YCoxNyO2 matrix and NiO-type rock salt layer coated on the surface of matrix, high valence transition metal M is +4 +6 valence transition metal, the thickness ofNiO-type rock salt layer is 4-50nm; The preparation method comprises: mixing a Ni1-x-yCoxNy(OH)2 precursor, a nano-scale high-valence transition metal M compound and a lithium compound, and calciningat a high temperature in an oxidizing atmosphere. In the high-nickel cathode material provided by the invention, the bulk phase doping forms a strong M. O bond, which helps to improve the structuralstability; The rock salt phase on the surface of the material can inhibit the corrosion of the electrolyte, slow down the phase transformation rate in the cycle process, and inhibit the increase of the surface impedance of the material. The synergistic effect of the two phases can significantly improve the cycle performance in the application of the positive electrode of the battery.
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Description

technical field

[0001] The invention relates to the technical field of positive electrode materials for power batteries, in particular to a high-nickel positive electrode material with a rock-salt phase-rich surface and a preparation method and application thereof. Background technique

[0002] With the continuous improvement of the energy density requirements of power batteries, the development of lithium-ion batteries with high capacity has become a top priority. Using ternary materials containing three metal elements, nickel-cobalt-manganese or nickel-cobalt-aluminum, as the positive electrode material of lithium-ion batteries can make Lithium-ion batteries have good electrochemical performance; however, as the content of nickel in the ternary material increases, the energy density of lithium-ion batteries increases more significantly, but its capacity retention rate decreases more. Therefore, in ensuring a certain energy On the basis of density, it is particularly import...

Claims

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