Granted Patent B2

US 12,548,769 · App. 17/400,130 · Granted Feb 10, 2026

Inventors: Jinyou Zhu (Ningde, CN); Yongsheng Guo (Ningde, CN); Chengdu Liang (Ningde, CN); Qian Liu (Ningde, CN); Wenguang Lin (Ningde, CN)

Assignee: Contemporary Amperex Technology (Hong Kong) Limited

H01M4/525C01G49/0072C01G53/50H01M10/054C01P2002/52C01P2002/76C01P2002/78C01P2004/61C01P2006/10C01P2006/11C01P2006/12C01P2006/40H01M2004/021H01M2004/028

Abstract

Claims (30)

1 . A positive electrode active material satisfying the chemical formula L x Na y M z Cu α Fe β Mn γ O 2+δ−0.5η X η , wherein

L is a doping element at alkali metal site and selected from one or more of Li + , K + , Mg 2+ , Ca 2+ and Zn 2+ ;

M is a doping element at transition metal site and selected from one or more of Li + , Ni 2+ , Mg 2+ , Mn 2+ , Zn 2+ , Co 2+ , Ca 2+ , Ba 2+ , Sr 2+ , Mn 3+ , Al 3+ , B 3+ , Cr 3+ , V 3+ , Zr 4+ , Ti 4+ , Sn 4+ , V 4+ , Mo 4+ , Mo 5+ , Ru 4+ , Nb 5+ , Si 4+ , Nb 6+ , Mo 6+ and Te 6+ ;

X is a doping element at oxygen site and selected from one or more of F − , Cl − , Br − and I − ,

0≤x≤0.35, 0.65≤y≤1, 0<α≤0.3, 0<β<0.5, 0<γ<0.5, −0.03<δ<0.03, 0≤η≤0.1, and z+α+β+γ=1; and mx+y+nz+2α+3β+4γ=2(2+δ), m is the valence state of L, and n is the valence state of M;

the positive electrode active material has a pH value of from 10.5 to 13; and

an interlayer spacing d 003 between two crystal planes (003) of the positive electrode active material is from 5.40 Å to 5.50 Å.

2 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a pH value of from 11.5 to 12.5.

3 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a space group of R 3 m.

4 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a mean particle size D v 50 of from 2 μm to 25 μm.

5 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a particle size D v 99 of from 15 μm to 80 μm.

6 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a mean particle size D v 50 of from 2 μm to 25 μm; and

the positive electrode active material has a particle size D v 99 of from 15 μm to 80 μm.

7 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a specific surface area of from 0.5 m 2 /g to 7.0 m 2 /g.

8 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a tapped density of from 1.5 g/cm 3 to 3.0 g/cm 3 .

9 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a compacted density of from 3.0 g/cm 3 to 5.0 g/cm 3 at a pressure of 8 t.

10 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a mean particle size D v 50 of from 5 μm to 15 μm.

11 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a particle size D v 99 of from 20 μm to 60 μm.

12 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a mean particle size D v 50 of from 5 μm to 15 μm; and

the positive electrode active material has a particle size D v 99 of from 20 μm to 60 μm.

13 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a specific surface area of from 0.8 m 2 /g to 3.0 m 2 /g.

14 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a tapped density of from 1.8 g/cm 3 to 2.8 g/cm 3 .

15 . The positive electrode active material according to claim 1 , wherein the positive electrode active material has a compacted density of from 3.5 g/cm 3 to 4.5 g/cm 3 at a pressure of 8 t.

16 . A method for preparing the positive electrode active material according to claim 1 , comprising the following steps:

mixing a L source, Na source, M source, Cu source, Fe source, Mn source and X source in a preset proportion, and then conducting a thermal treatment in an oxygen-containing atmosphere to obtain a sodium transition metal oxide;

washing the sodium transition metal oxide with a washing solution, wherein the washing solution has a pH value of from 3 to 13;

re-washing the washed sodium transition metal oxide with deionized water; and

drying the re-washed sodium transition metal oxide to obtain the positive electrode active material.

17 . A sodium-ion battery, comprising the positive electrode active material according to claim 1 .

18 . An apparatus, comprising the sodium-ion battery according to claim 17 .

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (34)