# US 12,015,121 B2 · Electrolyte, electrochemical device, lithium ion secondary battery, and module

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- Number: US 12,015,121 B2
- Document ID: US12015121B2
- Status: Granted
- Kind: B2
- Application number: 17/050,517
- Filed: 2019-04-11
- Published: 2021-04-22
- Granted: 2024-06-18
- Earliest claimed: 2018-04-27
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Tomoya Hidaka; Masakazu Kinoshita; Yoshiko Kuwajima; Takaya Yamada; Shigeaki Yamazaki; Kenzou Takahashi; Yuuki Suzuki
- Web page: https://patentgrep.com/patent/US12015121B2

## CPC

- H01M 10/0567: characterised by the additives
- H01G 11/64: characterised by additives
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01G 11/06: with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2300/0025: Organic electrolyte
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An electrolyte solution containing at least one compound (1) selected from the group consisting of a compound represented by the following formula (1-1) (wherein R111 to R113 are each individually a C1-C4 linear or branched alkyl group, and at least one selected from R111 to R113 is a C1-C4 branched alkyl group) and a compound represented by the following formula (1-2) (wherein R121 to R123 are each individually a C1-C4 linear or branched alkyl group, and at least one selected from R121 to R123 is a C1-C4 branched alkyl group). Also disclosed is an electrochemical device including the electrolyte solution, a lithium ion secondary battery including the electrolyte solution and a module including the electrochemical device or lithium ion secondary battery:

## Claims

### Claim 1

An electrolyte solution comprising a compound (1-2) represented by the following formula (1-2),
the formula (1-2) being
wherein R121 to R123 are each individually a C1-C4 linear or branched alkyl group, and at least one selected from R121 to R123 is a C3-C4 branched alkyl group.

### Claim 2 (depends on 1)

The electrolyte solution according to claim 1,
wherein the compound (1-2) is present in an amount of 0.01 ppm by mass or more relative to the electrolyte solution.

### Claim 3 (depends on 1)

The electrolyte solution according to claim 1,
wherein at least one selected from R121 to R123 is a tert-butyl group in the formula (1-2).

### Claim 4 (depends on 1)

An electrochemical device comprising the electrolyte solution according to claim 1.

### Claim 5 (depends on 1)

A lithium ion secondary battery comprising the electrolyte solution according to claim 1.

### Claim 6 (depends on 4)

A module comprising the electrochemical device according to claim 4.

### Claim 7 (depends on 5)

A module comprising the lithium ion secondary battery according to claim 5.

### Claim 8

An electrolyte solution comprising a compound (1-1) represented by the following formula (1-1),
the formula (1-1) being
wherein R111 to R113 are each individually a C1-C4 linear or branched alkyl group, and at least one selected from R111 to R113 is a C3-C4 branched alkyl group,
wherein the compound (1-1) is present in an amount of 0.01-1000 ppm by mass relative to the electrolyte solution.