# US 12,183,922 B2 · Lithium-ion battery and apparatus

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- Number: US 12,183,922 B2
- Document ID: US12183922B2
- Status: Granted
- Kind: B2
- Application number: 17/563,694
- Filed: 2021-12-28
- Published: 2022-04-21
- Granted: 2024-12-31
- Earliest claimed: 2018-12-14
- Assignees: Contemporary Amperex Technology (Hong Kong) Limited
- Applicants: Contemporary Amperex Technology (Hong Kong) Limited
- Inventors: Tiancheng Yi; Chunhua Hu; Shushi Dou; Yao Jiang; Chengdu Liang
- Web page: https://patentgrep.com/patent/US12183922B2

## CPC

- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- 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 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/48: of inorganic oxides or hydroxides
- 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 4/582: {Halogenides}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0567: characterised by the additives
- H01M 10/0568: characterised by the solutes
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 4/364: {as mixtures}
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/587: for inserting or intercalating light metals
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0025: Organic electrolyte
- 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

A lithium-ion battery and an apparatus. The lithium-ion battery includes an electrode assembly and an electrolytic solution. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separation film A positive active material in the positive electrode sheet includes Lix1Coy1M1-y1O2-z1Qz1. A negative active material in the negative electrode sheet includes one or more of Si, SiOx2, a Si/C composite material, and a Si alloy. The electrolytic solution contains an additive A and an additive B, the additive A is a polynitrile six-membered nitrogen-heterocyclic compound with a relatively low oxidation potential, and the additive B is a halogen-substituted cyclic carbonate compound. The lithium-ion battery has superb cycle performance and storage performance, especially under high-temperature and high-voltage conditions.

## Claims

### Claim 1

A lithium-ion battery, comprising an electrode assembly and an electrolytic solution, wherein the electrode assembly comprises a positive electrode sheet, a negative electrode sheet, and a separation film;
wherein,
a positive active material in the positive electrode sheet comprises Lix1Coy1M1-y1O2-z1Qz1, 1≤x1≤1.2, 0.8≤y1<1.0, 0<z1≤0.1, M is selected from the group consisting of Al, Ti, Zr, Mg, and any combinations thereof, and Q is F;
a negative active material in the negative electrode sheet comprises SiOx2, 0<x2≤2;
the electrolytic solution contains a lithium electrolyte salt, an additive A, and an additive B, the additive A is one or more selected from the group consisting of compounds represented by Formula I-2, and the additive B is fluoroethylene carbonate (FEC);
in the Formula I-2: R1, R2, R3, and R4 each are independently selected from the group consisting of a hydrogen atom, and a substituted or unsubstituted C1-C12 alkyl group, wherein a substituent group is selected from the group consisting of a halogen atom, a cyano group, and a C1-C6 alkoxy group; x and y each are selected from integers 0-2; m and n each are selected from integers 0-2; at least one of x and y is 0, and at least one of m and n is 2, wherein when x=0, m=1 or 2; when y=0, n=1 or 2;
wherein based on total mass of the electrolytic solution, a mass percentage of the additive A is 0.1%-10%; and
based on total mass of the electrolytic solution, a mass percentage of the additive B is 0.1%-30%.

### Claim 2 (depends on 1)

The lithium-ion battery according to claim 1, wherein
in the Formula I-2: R1, R2, R3, and R4 each are independently selected from the group consisting of a substituted or unsubstituted C1-C3 linear or branched alkyl group and a substituted or unsubstituted C5-C7 cycloalkyl group.

### Claim 3 (depends on 1)

The lithium-ion battery according to claim 1, wherein
in the Formula I-2, at least three of R1, R2, R3, and R4 are the same group.

### Claim 4 (depends on 3)

The lithium-ion battery according to claim 3, wherein
in the Formula I-2, at least three of R1, R2, R3, and R4 are a hydrogen atom.

### Claim 5 (depends on 1)

The lithium-ion battery according to claim 1, wherein an end-of-charge voltage of the lithium-ion battery is in a range of 4.2V-4.35V.

### Claim 6 (depends on 1)

The lithium-ion battery according to claim 1, wherein the positive active material in the positive electrode sheet is selected from the group consisting of Li1.05Co0.98Mg0.005Zr0.005Ti0.01O1.9F0.1, Li1.04Co0.95Mg0.02Zr0.03O1.95F0.05, Li1.04Co0.97Zr0.01Al0.02O1.9F0.1, Li1.04Co0.95Zr0.02Ti0.03O1.9F0.1, Li1.09Co0.97Mg0.02Ti0.01O1.95F0.05, and any combination thereof.

### Claim 7 (depends on 6)

The lithium-ion battery according to claim 6, wherein the positive active material in the positive electrode sheet is Li1.05Co0.98Mg0.005Zr0.005Ti0.01O1.9F0.1.

### Claim 8 (depends on 1)

The lithium-ion battery according to claim 1, wherein x2 of SiOx2 satisfies 0.9<x2<1.1.

### Claim 9 (depends on 1)

The lithium-ion battery according to claim 1, wherein the additive A is selected from the group consisting of:
and any combination thereof.

### Claim 10 (depends on 9)

The lithium-ion battery according to claim 9, wherein the additive A is:
or a combination thereof.

### Claim 11 (depends on 1)

The lithium-ion battery according to claim 1, wherein based on total mass of the electrolytic solution, a mass percentage of the additive A is 0.1%-2%.

### Claim 12 (depends on 1)

The lithium-ion battery according to claim 1, wherein based on total mass of the electrolytic solution, a mass percentage of the additive B is 0.1%-10%.

### Claim 13 (depends on 1)

The lithium-ion battery according to claim 1, wherein the lithium electrolyte salt comprises a complex salt of a Lewis acid and LiF, and the complex salt is selected from the group consisting of LiPF6, LiBF4, LiAsF6, and any combinations thereof.

### Claim 14 (depends on 1)

The lithium-ion battery according to claim 1, wherein the lithium electrolyte salt comprises an imidized or methylated lithium salt selected from the group consisting of (CF2)2(SO2)2NLi(cyclic), (CF2)3(SO2)2NLi(cyclic), LiC(SO2CF3)3, and any combination thereof.

### Claim 15 (depends on 1)

The lithium-ion battery according to claim 1, wherein the lithium electrolyte salt comprises a lithium salt having a structure of S(═O)2O, and the lithium salt is selected from the group consisting of LiSO3F, LiCH3SO4, LiC2H5SO4, lithium trifluoro((methylsulfonyl)oxy)borate (LiTFMSB), and any combination thereof.

### Claim 16 (depends on 1)

The lithium-ion battery according to claim 1, wherein the lithium electrolyte salt comprises a lithium salt having a structure of P═O, and the lithium salt is selected from the group consisting of LiPO2F2, Li2PO3F, and a combination thereof.

### Claim 17 (depends on 1)

The lithium-ion battery according to claim 1, wherein the lithium electrolyte salt comprises a lithium salt having an oxalate ligand, and the lithium salt is selected from the group consisting of lithium bis[oxalate-O,O′]borate (LiBOB) (LiBOB), lithium difluorobis[oxalate-O,O′] phosphate (LiPFO), and a combination thereof.

### Claim 18 (depends on 1)

The lithium-ion battery according to claim 1, wherein the electrolytic solution further contains an additive C that is one or more selected from the group consisting of vinylene carbonate, 1,3-propane sultone, and ethylene sulfate, and based on total mass of the electrolytic solution, a mass percentage of the additive C is 0.1%-10%.

### Claim 19 (depends on 1)

An apparatus comprising the lithium-ion battery according to claim 1.