Positive electrode material, preparation method therefor, lithium-ion battery and electric device

Patent metadata

Field	Value
Publication number	US-2026018601-A1
Application number	US-202519336537-A
Country	US
Kind code	A1
Filing date	Sep 23, 2025
Priority date	Nov 1, 2023
Publication date	Jan 15, 2026
Grant date	—

Abstract

A positive electrode material is disclosed, represented by the formula LiaNixCoyMn1-x-yMbO2-cQc, where 0.2≤a≤1.2, x≥0.6, y>0, b>0, and c>0. M comprises a high-valence cation and Q comprises an anion. The doping of a high-valence cation and an anion in a nickel-rich ternary material stabilizes the bulk structure during lithium deintercalation, reduces side reactions, lattice oxygen release, and transition metal dissolution, and improves cycling stability, high-temperature storage, and rate capability. The outer surface of the positive electrode material may further include a selenium-containing coating layer that reacts with residual lithium compounds and binds released lattice oxygen to suppress electrolyte oxidation. A conductive coating layer may be formed on the selenium-containing layer to prevent direct contact with the electrolyte and inhibit side reactions.

First claim

What is claimed is:

1 . A positive electrode material, the positive electrode material having the following chemical formula: Li a Ni x Co y Mn 1-x-y M b O 2-c Q c , wherein 0.2≤a≤1.2, x≥0.6, y>0, b>0, c>0, M comprises a high-valence cation, Q comprises an anion, the high-valence cation comprises a tetravalent or higher cation, and the anion comprises at least one of S 2− , Se 2− , Te 2− and P 3− .

2 . The positive electrode material according to claim 1 , wherein the high-valence cation comprises at least one of Mo 6+ , Sb 5+ , Zr 4+ , Ti 4+ , Nb 5+ , W 6+ , Y 5+ and Ta 5+ .

3 . The positive electrode material according to claim 1 , wherein 0.0005≤b≤0.01, and/or 0.001≤c≤0.1.

4 . The positive electrode material according to claim 1 , wherein an outer surface of the positive electrode material further comprises a first coating layer which comprises a selenium-containing substance.

5 . The positive electrode material according to claim 4 , wherein the selenium-containing substance comprises at least one of elemental selenium (Se), selenium oxide (SeO 2 ), selenium sulfide (SeS 2 ) and tellurium selenide (TeSe).

6 . The positive electrode material according to claim 4 , wherein a content of selenium element in the positive electrode material containing the first coating layer is 0.03% to 5%.

7 . The positive electrode material according to claim 4 , wherein based on 100% of a total mass of the positive electrode material, an addition amount of the selenium-containing substance ranges from 0.1% to 5%.

8 . The positive electrode material according to claim 7 , wherein based on 100% of the total mass of the positive electrode material, the addition amount of the selenium-containing substance ranges from 0.5% to 2%.

9 . The positive electrode material according to claim 4 , wherein a particle size Dv50 of the selenium-containing substance is 100 nm to 1000 nm.

10 . The positive electrode material according to claim 4 , wherein the particle size Dv50 of the selenium-containing substance is 100 nm to 500 nm.

11 . The positive electrode material according to claim 4 , wherein the positive electrode material further comprises a second coating layer which is coated on a surface of the first coating layer and comprises a conductive polymer.

12 . The positive electrode material according to claim 11 , wherein the conductive polymer comprises at least one of polyaniline, polypyrrole, polypyridine and polythiophene, wherein the second coating layer has a thickness of 50 nm to 500 nm, wherein the second coating layer has a thickness of 50 nm to 200 nm.

13 . A preparation method for the positive electrode material according to claim 1 ,
the preparation method for the positive electrode material comprising the following steps: mixing a nickel-rich ternary positive electrode material precursor with a high-valence cation dopant, sintering same to obtain a high-valence cation-doped positive electrode material A, mixing the positive electrode material A with an anion dopant, sintering same to obtain the positive electrode material, and marking the positive electrode material as a positive electrode material C, wherein the positive electrode material C contains a high-valence cation and an anion, and the high-valence cation comprises a tetravalent or higher cation; or the preparation method for the positive electrode material comprising the following steps: mixing a nickel-containing positive electrode material precursor with an anion dopant, sintering same to obtain an anion-doped positive electrode material B, mixing the positive electrode material B with a high-valence cation dopant, sintering same to obtain the positive electrode material, and marking the positive electrode material as a positive electrode material C, wherein the positive electrode material C contains a high-valence cation and an anion, and the high-valence cation comprises a tetravalent or higher cation.

14 . The preparation method for the positive electrode material according to claim 13 , wherein in the step of preparing the positive electrode material A, the sintering comprises primary sintering and secondary sintering, a temperature of the primary sintering is 350 to 500° C., a time of the primary sintering is 2 to 7 h, the temperature of the secondary sintering is 600 to 800° C., and the time of the secondary sintering is 3 to 6 h.

15 . The preparation method for the positive electrode material according to claim 12 , wherein in the step of preparing the positive electrode material B, the temperature of the sintering is 400° C. to 650° C.

16 . A preparation method for a positive electrode material, comprising:
mixing the positive electrode material C prepared by the preparation method according to claim 12 with a selenium-containing substance, heating same to obtain a positive electrode material, and marking the positive electrode material as a positive electrode material D, wherein a surface of the positive electrode material D has a selenium-containing substance coating layer.

17 . The preparation method for the positive electrode material according to claim 16 , wherein a heating temperature is 230° C. to 500° C.;
and/or, the heating time is 15 min to 120 min.

18 . The preparation method for the positive electrode material according to claim 1 , wherein based on 100% of a total mass of the positive electrode material D, an addition amount of the conductive polymer is 0.5% to 10%.

19 . A lithium-ion battery, the lithium-ion battery comprising the positive electrode material according to claim 1 .

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Wu Kai
• Yan Guanfusheng
• Jin Chao
• Ye Yonghuang
• Zheng Shibing
• Zhong Ming
• Wu Zirui
• Zhang Xin
• Dai Zhipeng

Classifications

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/628 Primary

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title

• H01M4/624

  Electric conductive fillers · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title