# US 12,119,446 B2 · Electrolyte and electrochemical device

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- Number: US 12,119,446 B2
- Document ID: US12119446B2
- Status: Granted
- Kind: B2
- Application number: 17/054,053
- Filed: 2020-03-31
- Published: 2023-04-06
- Granted: 2024-10-15
- Earliest claimed: 2020-03-31
- Assignees: Ningde Amperex Technology Limited
- Applicants: Ningde Amperex Technology Limited
- Inventors: Mingming Guan; Yali Xiong; Jianming Zheng; Jianyu Liu
- Web page: https://patentgrep.com/patent/US12119446B2

## CPC

- 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 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- H01M 2300/0025: Organic electrolyte
- H01M 2300/0028: characterised by the solvent
- 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

An electrolyte, comprising a compound of Formula I and an additive A, R1, R2, R3, R4, R5, R6, R7 and R8 are each independently selected from: hydrogen, halo, —COOX, substituted or unsubstituted C1-8alkyl, substituted or unsubstituted C2-10alkenyl, substituted or unsubstituted C2-10alkynyl, substituted or unsubstituted C1-8alkoxy, or —Ra—S(═O)2—Rb, wherein Ra is selected from substituted or unsubstituted C1-8alkylene, Rb is selected from halo or substituted or unsubstituted C1-8alkyl, and at least one of R1, R2, R3, R4, R5, R6, R7 and R8 is —COOX. When substituted, the substituent is selected from cyano or halo; and X is selected from Li+, Na+, K+ or Rb+. The additive A is at least one selected from fluoroethylene carbonate, LiPO2F2, or vinylene carbonate.

## Claims

### Claim 1

An electrolyte, comprising: a compound of Formula I and an additive A,
wherein,
R1, R2, R3, R4, R5, R6, R7 and R8 are each independently selected from: hydrogen, halo, —COOX, substituted or unsubstituted C1-8alkyl, substituted or unsubstituted C2-10alkenyl, substituted or unsubstituted C2-10alkynyl, substituted or unsubstituted C1-8alkoxy, or —Ra—S(═O)2—Rb, wherein Ra is selected from substituted or unsubstituted C1-8alkylene, Rb is selected from halo or substituted or unsubstituted C1-8alkyl; and at least one of R1, R2, R3, R4, R5, R6, R7 and R8 is —COOX,
wherein when substituted, the substituent is selected from cyano or halo; and
X is selected from Li+, Na+, K+ or Rb+,
wherein the additive A is at least one selected from fluoroethylene carbonate, LiPO2F2, or vinylene carbonate,
wherein the electrolyte further comprises a compound of Formula III,
the compound of Formula III is 0.1% to 20% based on a total weight of the electrolyte, and
the compound of Formula III comprises at least one of:

### Claim 2 (depends on 1)

The electrolyte according to claim 1, wherein the compound of Formula I is at least one selected from:

### Claim 3 (depends on 1)

The electrolyte according to claim 1, wherein a weight ratio of the compound of Formula I to the additive A is 30:1 to 1:200.

### Claim 4 (depends on 1)

The electrolyte according to claim 1, wherein the compound of Formula I is 0.05% to 5% based on a total weight of the electrolyte, and the additive A is 0.01% to 16% based on the total weight of the electrolyte.

### Claim 5 (depends on 1)

The electrolyte according to claim 1, further comprising a compound of Formula II:
wherein,
R9 is selected from hydrogen, cyano, halo, substituted or unsubstituted C1-8 alkyl, or substituted or unsubstituted C1-8 alkoxy;
R10, R11 and R12 are each independently selected from a covalent bond, substituted or unsubstituted C1-8 alkylene, or —O—R′—, wherein R′ is substituted or unsubstituted C1-8 alkylene,
wherein when substituted, the substituent is selected from cyano or halo,
wherein the compound of Formula II is 0.05% to 10% based on the total weight of the electrolyte.

### Claim 6 (depends on 5)

The electrolyte according to claim 5, wherein the compound of Formula II comprises at least one of:

### Claim 7 (depends on 1)

The electrolyte according to claim 1, further comprising a compound of Formula IV:
wherein R41 and R42 are each independently selected from substituted or unsubstituted C1-10 alkyl, wherein when substituted, they are substituted with one or more substituents selected from F, Cl or Br, wherein the compound of Formula IV is 5% to 50% based on the total weight of the electrolyte.

### Claim 8 (depends on 7)

The electrolyte according to claim 7, wherein the compound of Formula IV comprises at least one of

### Claim 9 (depends on 5)

The electrolyte according to claim 5, further comprising a compound of Formula IV:
wherein R41 and R42 are each independently selected from substituted or unsubstituted C1-10 alkyl, wherein when substituted, they are substituted with one or more substituents selected from F, Cl or Br, wherein the compound of Formula IV is 5% to 50% based on the total weight of the electrolyte.

### Claim 10 (depends on 1)

The electrolyte according to claim 1, further comprising a compound of Formula IV:
wherein R41 and R42 are each independently selected from substituted or unsubstituted C1-10 alkyl, wherein when substituted, they are substituted with one or more substituents selected from F, Cl or Br, wherein the compound of Formula IV is 5% to 50% based on the total weight of the electrolyte.

### Claim 11 (depends on 1)

The electrolyte according to claim 1, further comprising a compound of Formula II:
wherein:
R9 is selected from hydrogen, cyano, halo, substituted or unsubstituted C1-8 alkyl, or substituted or unsubstituted C1-8 alkoxy;
R10, R11 and R12 are each independently selected from a covalent bond, substituted or unsubstituted C1-8 alkylene, or —O—R′—, wherein R′ is substituted or unsubstituted C1-8 alkylene,
wherein when substituted, the substituent is selected from cyano or halo,
wherein the compound of Formula II is 0.05% to 10% based on the total weight of the electrolyte.

### Claim 12

An electrochemical device, comprising a positive electrode, a negative electrode, and an electrolyte, wherein
the electrolyte comprises a compound of Formula I and an additive A,
wherein:
R1, R2, R3, R4, R5, R6, R7 and R8 are each independently selected from: hydrogen, halo, —COOX, substituted or unsubstituted C1-8alkyl, substituted or unsubstituted C2-10alkenyl, substituted or unsubstituted C2-10alkynyl, substituted or unsubstituted C1-8alkoxy, or —Ra—S(═O)2—Rb, wherein Ra is selected from substituted or unsubstituted C1-8 alkylene, Rb is selected from halo or substituted or unsubstituted C1-8alkyl, and at least one of R1, R2, R3, R4, R5, R6, R7 and R8 is —COOX,
wherein when substituted, the substituent is selected from cyano or halo; and
X is selected from Li+, Na+, K+ or Rb+,
wherein the additive A is at least one selected from fluoroethylene carbonate, LiPO2F2, or vinylene carbonate,
wherein the electrolyte further comprises a compound of Formula III,
the compound of Formula III is 0.1% to 20% based on a total weight of the electrolyte, and
the compound of Formula III comprises at least one of:

### Claim 13 (depends on 12)

The electrochemical device according to claim 12, wherein the electrolyte further comprises a compound of Formula II:
wherein:
R9 is selected from hydrogen, cyano, halo, substituted or unsubstituted C1-8 alkyl, or substituted or unsubstituted C1-8 alkoxy;
R10, R11 and R12 are each independently selected from a covalent bond, substituted or unsubstituted C1-8 alkylene, or —O—R′—, wherein R′ is substituted or unsubstituted C1-8 alkylene,
wherein when substituted, the substituent is selected from cyano or halo,
wherein the compound of Formula II is 0.05% to 10% based on the total weight of the electrolyte.

### Claim 14 (depends on 12)

The electrochemical device according to claim 12, wherein the electrolyte further comprises a compound of Formula IV:
wherein R41 and R42 are each independently selected from substituted or unsubstituted C1-10 alkyl, wherein when substituted, they are substituted with one or more substituents selected from F, Cl or Br, wherein the compound of Formula IV is 5% to 50% based on the total weight of the electrolyte.

### Claim 15 (depends on 12)

The electrochemical device according to claim 12, wherein the weight ratio of the compound of Formula I to the additive A is 30:1 to 1:200.

### Claim 16

An electronic device, comprising an electrochemical device, wherein the electrochemical device comprises a positive electrode, a negative electrode, and an electrolyte, wherein
the electrolyte comprises a compound of Formula I and an additive A,
wherein:
R1, R2, R3, R4, R5, R6, R7 and R8 are each independently selected from: hydrogen, halo, —COOX, substituted or unsubstituted C1-8alkyl, substituted or unsubstituted C2-10alkenyl, substituted or unsubstituted C2-10alkynyl, substituted or unsubstituted C1-8alkoxy, or —Ra—S(═O)2—Rb, wherein Ra is selected from substituted or unsubstituted C1-8 alkylene, Rb is selected from halo or substituted or unsubstituted C1-8alkyl, and at least one of R1, R2, R3, R4, R5, R6, R7 and R8 is —COOX,
wherein when substituted, the substituent is selected from cyano or halo; and
X is selected from Li+, Na+, K+ or Rb+,
wherein the additive A is at least one selected from fluoroethylene carbonate, LiPO2F2, or vinylene carbonate,
wherein the electrolyte further comprises a compound of Formula III,
the compound of Formula III is 0.1% to 20% based on a total weight of the electrolyte, and
the compound of Formula III comprises at least one of:

### Claim 17 (depends on 13)

The electrochemical device according to claim 13, wherein the compound of Formula II comprises at least one of:

### Claim 18 (depends on 14)

The electrochemical device according to claim 14, wherein the compound of Formula IV comprises at least one of