Electrolyte, and electrochemical device and secondary battery which use same

Patent metadata

Field	Value
Publication number	US-2025343268-A1
Application number	US-202519268150-A
Country	US
Kind code	A1
Filing date	Jul 14, 2025
Priority date	Jan 25, 2023
Publication date	Nov 6, 2025
Grant date	—

Abstract

Provided are an electrolytic solution that enables improvement in durability of an electrochemical device and reduction of a resistance increase ratio thereof, and an electrochemical device and a secondary battery using the same. An electrolytic solution comprising at least one compound represented by the following general formula (1):

wherein Rf 1 is a fluorinated alkyl group having 1 to 5 carbon atoms.

First claim

1 . An electrolytic solution comprising at least one compound represented by the following general formula (1):

wherein Rf 1 is any of the following formulas (1b) to (1d):

2 . The electrolytic solution according to claim 1 , wherein a content of the compound represented by the general formula (1) is 0.0001 ppm to 500 ppm with respect to the whole electrolytic solution.

3 . An electrolytic solution comprising at least one compound represented by the following general formula (1):

wherein Rf 1 is a fluorinated alkyl group having 1 to 5 carbon atoms,
wherein a content of the compound represented by the general formula (1) is 0.0001 ppm to 500 ppm with respect to the whole electrolytic solution.

4 . The electrolytic solution according to claim 3 , wherein Rf 1 of the compound represented by the general formula (1) is the following formulas (1a) or (1e):

5 . The electrolytic solution according to claim 1 , further comprising a compound represented by the following general formula (2):

wherein Rf 2 and Rf 3 are each independently a fluorinated alkyl group having 1 to 8 carbon atoms.

6 . The electrolytic solution according to claim 5 , wherein the compound represented by the general formula (2) is at least one selected from the group consisting of CF 2 HCF 2 CH 2 OCF 2 CF 2 H, CF 2 HCF 2 CH 2 OCF 2 CHFCF 3 , and CF 3 CF 2 CH 2 OCF 2 CF 2 H.

7 . The electrolytic solution according to claim 5 , wherein a content of the compound represented by the general formula (2) is 0.01 to 80% by mass with respect to the whole electrolytic solution.

8 . The electrolytic solution according to claim 5 , wherein the content of the compound represented by the general formula (1) is 0.00000001 to 11% by mass with respect to the compound represented by the general formula (2).

9 . The electrolytic solution according to claim 5 , wherein the content of the compound represented by the general formula (2) is 0.1 to 75% by mass with respect to the whole electrolytic solution, and the content of the compound represented by the general formula (1) is 0.000025 to 0.35% by mass with respect to the compound represented by the general formula (2).

10 . The electrolytic solution according to claim 1 , wherein the compound represented by the general formula (1) is CF 2 HCF 2 CH 2 OLi.

11 . The electrolytic solution according to claim 5 , wherein the compound represented by the general formula (2) is CF 2 HCF 2 CH 2 OCF 2 CF 2 H.

12 . An electrochemical device comprising the electrolytic solution according to claim 1 .

13 . A secondary battery comprising the electrolytic solution according to claim 1 .

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

Assignees

• Daikin Ind Ltd

Inventors

• Hidaka Tomoya
• Shimooka Toshiharu
• Kobayashi Nao
• Yamazaki Shigeaki

Classifications

• H01M2300/0028

  characterised by the solvent · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title