# US 11,909,000 B2 · Lithium-ion secondary battery, battery module, battery pack, and powered device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,909,000 B2
- Document ID: US11909000B2
- Status: Granted
- Kind: B2
- Application number: 17/820,944
- Filed: 2022-08-19
- Published: 2022-12-22
- Granted: 2024-02-20
- Earliest claimed: 2021-05-28
- Assignees: Contemporary Amperex Technology Co., Limited
- Applicants: Contemporary Amperex Technology Co., Limited
- Inventors: Chang Peng; Peipei Chen; Hailin Zou; Chengdu Liang
- Web page: https://patentgrep.com/patent/US11909000B2

## CPC

- H01M 10/0568: characterised by the solutes
- 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 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 4/625: {Carbon or graphite}
- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- 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 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- 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 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/028: {Positive electrodes}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- 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 secondary battery is provided, where an electrolyte solution of the lithium-ion secondary battery comprises a highly heat-stable salt (My+)x/yR1(SO2N−)xSO2R2, where the My+ is a metal ion, R1 and R2 are each independently a fluorine atom, an alkyl with 1-20 carbon atoms, a fluoroalkyl with 1-20 carbon atoms, or a fluoroalkoxy with 1-20 carton atoms, x is 1, 2, or 3, and y is 1, 2, or 3. A mass percent of the salt in the electrolyte solution is set as k2%; a temperature rise coefficient k1 of the positive electrode sheet satisfies 2.5≤k1≤32, where k1=Cw/Mc, Cw is a positive electrode material load per unit area (mg/cm2) on the surface of any side of the positive electrode current collector on which a positive electrode material layer is loaded, and Mc is a carbon content (%) of the positive electrode material layer; and the lithium-ion secondary battery satisfies 0.34≤k2/k1≤8.

## Claims

### Claim 1

A lithium-ion secondary battery, comprising:
a positive electrode sheet,
a negative electrode sheet,
a separator, and
an electrolyte solution,
wherein the positive electrode sheet comprises a positive electrode current collector, and a positive electrode material layer arranged on at least one surface of the positive electrode current collector, the positive electrode material layer comprising a positive electrode active material and carbon,
wherein
the electrolyte solution comprises a heat-stable salt and a low-impedance additive; and
a chemical formula of the heat-stable salt is (My+)x/yR1(SO2N−)xSO2R2, wherein the My+ is a metal ion, R1 and R2 are each independently a fluorine atom, an alkyl with 1-20 carbon atoms, a fluoroalkyl with 1-20 carbon atoms, or a fluoroalkoxy with 1-20 carton atoms, the x is 1, 2, or 3, the y is 1, 2, or 3; and a mass percent of the heat-stable salt in the electrolyte solution is set as k2%;
wherein a temperature rise coefficient of the positive electrode sheet k1=Cw/Mc, Cw is a positive electrode material load per unit area (mg/cm2) on the surface of any side of the positive electrode current collector on which the positive electrode material layer is loaded, and Mc is a carbon content (wt %) of the positive electrode material layer, 18≤Cw≤30, 1≤Mc≤7;
wherein the lithium-ion secondary battery satisfies 0.34≤k2/k1≤8; and
wherein the low-impedance additive is
a fluorosulfonate NSO3F,
wherein N is a metal ion of a salt.

### Claim 2 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein the lithium-ion secondary battery satisfies at least one of the following conditions:
3.3≤k1≤14.5; and
0.48≤k2/k1≤7.

### Claim 3 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein the My+ is at least one selected from the group consisting of Li+, Na+, K+, Rb+, Cs+, Mg2+, Ca2+, Ba2+, Al3+, Fe2+, Fe3+, Ni2+, and Ni3+.

### Claim 4 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein the R1 and R2 are each independently a fluorine atom, an alkyl with 1-10 carbon atoms, a fluoroalkyl with 1-10 carbon atoms, or a fluoroalkoxy with 1-10 carbon atoms.

### Claim 5 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein a mass percent of the low-impedance additive in the electrolyte solution is from 0.1% to 10%.

### Claim 6 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein the electrolyte solution further comprises a lithium salt, and the lithium salt is at least one selected from the group consisting of LiPF6, LiAsF6, and LiBF4.

### Claim 7 (depends on 6)

The lithium-ion secondary battery according to claim 6, wherein a mass percent of the lithium salt in the electrolyte solution is from 0.1% to 10%.

### Claim 8 (depends on 6)

The lithium-ion secondary battery according to claim 6, wherein a total lithium salt content in the electrolyte solution is in a range from 5 wt % to 50 wt % based on a total weight of the electrolyte solution.

### Claim 9 (depends on 1)

The lithium-ion secondary battery according to claim 1,
wherein the positive electrode active material is one or more selected from the group consisting of a lithium transition metal oxide, an olivine-structured lithium-containing phosphate, and their respective modified compounds,
wherein the lithium transition metal oxide is one or more selected from the group consisting of lithium-cobalt oxide, lithium-nickel oxide, lithium-manganese oxide, lithium-nickel-cobalt oxide, lithium-manganese-cobalt oxide, lithium-nickel-manganese oxide, lithium-nickel-cobalt-manganese oxide LiNiaCobMncO2 satisfying a+b+c=1 and a<0.8, lithium-nickel-cobalt-aluminum oxide, and modified compounds thereof.

### Claim 10 (depends on 1)

A battery module comprising the lithium-ion secondary battery according to claim 1.

### Claim 11 (depends on 10)

A battery pack comprising the battery module according to claim 10.

### Claim 12 (depends on 1)

A powered device comprising one or more of the lithium-ion secondary battery according to claim 1.