# US 12,113,214 B2 · Positive electrode material and preparation method and use therefor, lithium-ion battery positive electrode pole piece, and lithium-ion battery

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- Number: US 12,113,214 B2
- Document ID: US12113214B2
- Status: Granted
- Kind: B2
- Application number: 18/173,532
- Filed: 2023-02-23
- Published: 2023-06-29
- Granted: 2024-10-08
- Earliest claimed: 2021-06-30
- Assignees: Beijing Easpring Material Technology Co., Ltd.
- Applicants: Beijing Easpring Material Technology Co., Ltd.
- Inventors: Xuequan Zhang; Wenhui Li; Yanbin Chen; Yafei Liu
- Web page: https://patentgrep.com/patent/US12113214B2

## CPC

- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/0492: {Chemical attack of the support material}
- H01M 4/364: {as mixtures}
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/622: {being polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present disclosure relates to the technical field of secondary battery, and discloses a positive electrode material and a preparation method and use therefor, a lithium-ion battery positive electrode poly piece, and a lithium-ion battery.

## Claims

### Claim 1

A cathode material comprising multicrystal particles (A) and single crystal particles or quasi single crystal particles (B);
the particle diameters D5, D50 and D95 of the cathode material satisfy the relationship shown in Formula I:
1.5≤K95=(D95−D5)/D50≤2.5 Formula I;
wherein the surface of the multicrystal particles (A) is coated with a cladding layer (P);
wherein the cladding layer (P) is provided by conductive graphite and conductive polymer, or
wherein the cladding layer (P) is provided by conductive polymer;
wherein a mass ratio of the multicrystal particles (A) to the cladding layer (P) is 1:0.001-0.05, based on the total weight of the multicrystal particles (A);
wherein the cathode material has a composition represented by Formula (1):
[Li1+a(NixCoyMnzM1-x-y-z)NkO2-wJwπ (1);
in the Formula (1), 0≤a≤0.3, 0.83≤x≤1, 0≤y≤1, 0≤z≤1, 0≤k≤0.1, 0≤w≤0.1, M is at least one selected from the group consisting of B, Na, K, Mg, Al, Ca, Ti, Fe, Zn, Sr, Y, Zr, Nb, Mo, Sn, Ba, Ta and W;
N is at least one selected from the group consisting of B, Mg, Al, Ti, V, Sr, Y, Zr, Nb, Mo and W;
J is at least one selected from the group consisting of F, Cl and P,
wherein the particle diameters D5, D50 and D95 of the multicrystal particles (A) satisfy the relationship shown in Formula II:
0<KA95=(D95−D5)/D50<1 Formula II;
wherein the cathode material has a powder compaction density greater than or equal to 3.63 g/cm3 under a pressure condition of 20 kN, and
wherein content of Ni in the multicrystal particles (A) is equal with content of Ni in single crystal particles or quasi single crystal particles (B).

### Claim 2 (depends on 1)

The cathode material of claim 1, wherein 1.5≤K95≤2.

### Claim 3 (depends on 1)

The cathode material of claim 1, wherein the multicrystal particles (A) have a particle diameter D50 within a range of 7-22 μm;
and/or, the single crystal particles or quasi single crystal particles (B) have a particle diameter D50 within a range of 0.2-7 μm;
and/or, the particle diameters D5, D50 and D95 of the single crystal particles or quasi single crystal particles (B) satisfy the relationship shown in Formula III:
0.2≤KB95=(D95−D5)/D50≤3 Formula III.

### Claim 4 (depends on 1)

The cathode material of claim 1, wherein the conductive polymer is at least one selected from the group consisting of polyaniline, polypyrrole, polythiophene, polyacetylene, poly(para-phenylene sulfide), poly(3,4-ethylenedioxythiophene) and polyphenylacetylene.

### Claim 5 (depends on 1)

The cathode material of claim 1, wherein a mass ratio of the multicrystal particles (A) to the single crystal particles or quasi single crystal particles (B) in the cathode material is 0.01-9:1.

### Claim 6 (depends on 1)

The cathode material of claim 1, wherein an individual particle strength of the multicrystal particles (A) in a test of the micro-mechanical testing machine is greater than or equal to 50 MPa;
and, a deformation quantity of the multicrystal particles (A) prior to fracture is within a range D50×(5-25%) of the multicrystal particles (A).

### Claim 7 (depends on 1)

The cathode material of claim 1, wherein
a specific surface area of the cathode material is denoted as A1, the specific surface area of the cathode material after a pressure fracturing of 4.5 T is denoted as A2;
wherein (A2−A1)/A1×100%≤40%.

### Claim 8 (depends on 1)

A lithium ion battery comprising the cathode electrode prepared with the cathode material of claim 1.