# US 12,597,641 B2 · Non-aqueous electrolyte, secondary battery, and electrical apparatus

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- Number: US 12,597,641 B2
- Document ID: US12597641B2
- Status: Granted
- Kind: B2
- Application number: 19/211,299
- Filed: 2025-05-19
- Published: 2025-09-04
- Granted: 2026-04-07
- Earliest claimed: 2023-03-09
- Assignees: Contemporary Amperex Technology (Hong Kong) Limited
- Applicants: Contemporary Amperex Technology (Hong Kong) Limited
- Inventors: Jiao Liu; Limei Zhang; Peipei Chen; Jiamo Ren
- Web page: https://patentgrep.com/patent/US12597641B2

## CPC

- H01M 10/0567: characterised by the additives
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/054: Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- C07D 327/10: two oxygen atoms and one sulfur atom, e.g. cyclic sulfates
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2300/0025: Organic electrolyte
- H01M 2300/0042: Four or more solvents
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided are a non-aqueous electrolyte, a secondary battery, and an electrical apparatus. The non-aqueous electrolyte comprises an additive, the additive comprising a cyclic sulfate ester compound having the structure shown in general formula (I), wherein R1, R2, R3, R4, R5, and R6 are each independently selected from any one of: a group having the structure shown in general formula (II), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, where n1, n2 and n3 are each independently any integer 0-2.

## Claims

### Claim 1

A non-aqueous electrolytic solution comprising a non-aqueous solvent, an electrolyte and an additive, wherein the non-aqueous solvent comprises a carbonate, the electrolyte comprises a lithium salt, the additive comprises a cyclic sulfate compound having a structure represented by formula (I),
wherein R1, R2, R3, and R4 are each independently selected from any one of a group having a structure represented by general formula (II), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and n1 and n2 are each independently any integer of 0-2;
formula (II) is
R5 and R6 are each independently selected from any one of a group having a structure represented by general formula (II), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and n3 is any integer of 0-2;
R1 and R2 are not hydrogen atoms at the same time, and R3 and R4 are not hydrogen atoms at the same time;
or R1, R2, R3, R4, R5, and Re satisfy the following:
R1 and R2 are hydrogen atoms at the same time, one of R3 and R4 is a hydrogen atom while the other is any one of a group having a structure represented by general formula (II), a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and R5 and R6 in the group having a structure represented by general formula (II) are not hydrogen atoms at the same time;
or R1, R2, R3, R4, R5, and R6 satisfy the following:
R3 and R4 are hydrogen atoms at the same time, one of R1 and R2 is a hydrogen atom while the other is any one of a group having a structure represented by general formula (II), a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and R5 and R6 in the group having a structure represented by general formula (II) are not hydrogen atoms at the same time,
a mass content of the cyclic sulfate compound in the non-aqueous electrolytic solution is 0.001%-20%.

### Claim 2 (depends on 1)

The non-aqueous electrolytic solution according to claim 1, wherein the cyclic sulfate compound is selected from the group consisting of:

### Claim 3 (depends on 1)

The non-aqueous electrolytic solution according to claim 1, wherein the cyclic sulfate compound has a structure represented by general formula (I-1),
wherein R1, R2, R3, and R4 are each independently selected from any one of a group having a structure represented by general formula (II-1), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group;
general formula (II-1) is
R5 and R6 are each independently selected from any one of a group having a structure represented by general formula (II-1), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group.

### Claim 4 (depends on 2)

The non-aqueous electrolytic solution according to claim 2, wherein
R1, R2, R3, R4, R5, and R6 are each independently selected from any one of a group having a structure represented by general formula (II-1), a hydrogen atom, a halogen atom, a C1-C3 alkyl group, a C1-C3 haloalkyl group, a C1-C3 alkoxy group, a C1-C3 haloalkoxy group, a C2-C3 alkenyl group, a C1-C3 ester group, a cyano group, and a sulfonic acid group.

### Claim 5 (depends on 1)

The non-aqueous electrolytic solution according to claim 1, wherein the carbonate of the non-aqueous solvent comprises one selected from the group consisting of a cyclic carbonate, a chain carbonate, and a mixture thereof, the cyclic carbonate is one selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, fluoroethylene carbonate, and any combination thereof, and the chain carbonate is one selected from the group consisting of ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, and any combination thereof.

### Claim 6 (depends on 1)

The non-aqueous electrolytic solution according to claim 1, wherein the lithium salt is one selected from the group consisting of lithium hexafluorophosphate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, and any combination thereof.

### Claim 7 (depends on 1)

The non-aqueous electrolytic solution according to claim 1, wherein the additive further comprises 1,3-propane sultone.

### Claim 8 (depends on 1)

A secondary battery, comprising a positive electrode plate, an electrolytic solution, a separation film, and a negative electrode plate, wherein the electrolytic solution is the non-aqueous electrolytic solution according to claim 1.

### Claim 9 (depends on 8)

An electric device, comprising a secondary battery, wherein the secondary battery comprises the secondary battery according to claim 8.