Electrolytic solution, and electrochemical device and secondary battery using same

Patent metadata

Field	Value
Publication number	US-2025349897-A1
Application number	US-202519276748-A
Country	US
Kind code	A1
Filing date	Jul 22, 2025
Priority date	Jan 25, 2023
Publication date	Nov 13, 2025
Grant date	—

Abstract

An electrolytic solution that enables improvement in durability of an electrochemical device, reduction of the amount of gas generated therein, and reduction of the amount of metal precipitated therein, and an electrochemical device and a secondary battery using the electrolytic solution. An electrolytic solution including at least one compound represented by the formula (1) of the disclosure (i.e., Rf1OR, wherein Rf1 is a fluorinated alkyl group having 1 to 5 carbon atoms, and R is K or Na).

First claim

1 . 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, and R is K or Na.

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

3 . The electrolytic solution according to claim 1 , wherein a content of the compound represented by the general formula (1) is 0.01 ppm to 10,000 ppm with respect to the whole electrolytic solution.

4 . 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.

5 . The electrolytic solution according to claim 4 , 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.

6 . The electrolytic solution according to claim 4 , wherein a content of the compound represented by the general formula (2) is 0.1 to 90% by mass with respect to the whole electrolytic solution.

7 . The electrolytic solution according to claim 4 , wherein the content of the compound represented by the general formula (1) is 0.0000001 to 10% by mass with respect to the compound represented by the general formula (2).

8 . The electrolytic solution according to claim 4 , 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 0.001 to 5% by mass with respect to the compound represented by the general formula (2).

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

10 . The electrolytic solution according to claim 4 , wherein the compound represented by the general formula (2) is CF 2 HCF 2 CH 2 OCF 2 CF 2 H.

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

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

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

Assignees

• Daikin Ind Ltd

Inventors

• Hidaka Tomoya
• Terada Junpei
• Fujiwara Kae
• Yamazaki Shigeaki

Classifications

• H01M2300/004

  Three solvents · CPC title

• H01M2300/0034

  Fluorinated solvents · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/054 Primary

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title