Non-aqueous electrolyte solution

Patent metadata

Field	Value
Publication number	US-9397368-B2
Application number	US-201113880233-A
Country	US
Kind code	B2
Filing date	Oct 11, 2011
Priority date	Oct 19, 2010
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

The present invention directs to a non-aqueous electrolyte solution, including (I) at least one compound selected from the group consisting of fluorinated linear sulfones and fluorinated linear sulfonic acid esters, and (II) an electrolyte salt. Such a non-aqueous electrolyte solution has high oxidation resistance, minimizes its decomposition even when hydrofluoric acid is produced. Also, the solution is less likely to cause, in the case of being used for a secondary cell, swelling of the cell and lowering of the battery performance.

First claim

The invention claimed is:

1. A non-aqueous electrolyte solution, comprising
(I) at least one compound selected from the group consisting of fluorinated linear sulfones and fluorinated linear sulfonic acid esters, and
(II) an electrolyte salt,
wherein the fluorinated linear sulfonic acid ester is at least one selected from the group consisting of HCF 2 CF 2 CH 2 OSO 2 CH 3 , HCF 2 CF 2 CH 2 OSO 2 CH 2 CH 3 , CF 3 CH 2 OSO 2 CH 2 CH 3 , CF 3 CF 2 CH 2 OSO 2 CH 3 , and CF 3 CF 2 CH 2 OSO 2 CH 2 CH 3 , and
the fluorinated linear sulfone is at least one selected from the group consisting of the following compounds:

2. The non-aqueous electrolyte solution according to claim 1 , further comprising
(III) a non-fluorinated cyclic carbonate, and
(IV) a non-fluorinated chain carbonate.

3. A solvent for non-aqueous electrolyte solutions, comprising:
(I) at least one compound selected from the group consisting of fluorinated linear sulfones and fluorinated linear sulfonic acid esters;
(III) a non-fluorinated cyclic carbonate; and
(IV) a non-fluorinated chain carbonate,
the solvent containing 5 to 50 vol % of the component (III), 44.9 to 94.9 vol % of the component (IV), and 0.1 to 20 vol % of the component (I), with the components (III), (IV), and (I) constituting 100 vol % of the solvent,
wherein the fluorinated linear sulfonic acid ester is at least one selected from the group consisting of HCF 2 CF 2 CH 2 OSO 2 CH 3 , HCF 2 CF 2 CH 2 OSO 2 CH 2 CH 3 , CF 3 CH 2 OSO 2 CH 2 CH 3 , CF 3 CF 2 CH 2 OSO 2 CH 3 , and CF 3 CF 2 CH 2 OSO 2 CH 2 CH 3 , and
the fluorinated linear sulfone is at least one selected from the group consisting of the following compounds:

4. A non-aqueous electrolyte solution, comprising
the solvent according to claim 3 , and
the electrolyte salt (II).

5. The non-aqueous electrolyte solution according to claim 2 ,
wherein the non-fluorinated cyclic carbonate (III) is at least one selected from the group consisting of ethylene carbonate, propylene carbonate, and butylene carbonate.

6. The non-aqueous electrolyte solution according to claim 3 ,
wherein the non-fluorinated chain carbonate (IV) is at least one selected from the group consisting of dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate.

7. The non-aqueous electrolyte solution according to claim 1 ,
wherein the electrolyte salt (II) is at least one selected from the group consisting of LiPF 6 , LiBF 4 , LiCF 3 SO 3 , LiN(CF 3 SO 2 ) 2 , LiN(C 2 F 5 SO 2 ) 2 , lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, and salts represented by a formula: LiPF a (C n F 2n+1 ) 6−a , wherein a is an integer of 0 to 5, and n is an integer of 1 to 6.

8. The non-aqueous electrolyte solution according to claim 1 , for lithium-ion secondary batteries.

9. A lithium-ion secondary battery comprising
the non-aqueous electrolyte solution according to claim 1 .

10. A module comprising
the lithium-ion secondary battery according to claim 9 .

11. An electric double layer capacitor comprising
the non-aqueous electrolyte solution according to claim 1 .

12. The non-aqueous electrolyte solution according to claim 1 , comprising at least one fluorinated linear sulfone selected from the group consisting of the following compounds:

13. The non-aqueous electrolyte solution according to claim 1 , comprising at least one fluorinated sulfonic acid ester selected from the group consisting of HCF 2 CF 2 CH 2 OSO 2 CH 3 , HCF 2 CF 2 CH 2 OSO 2 CH 2 CH 3 , CF 3 CH 2 OSO 2 CH 2 CH 3 , CF 3 CF 2 CH 2 OSO 2 CH 3 , and CF 3 CF 2 CH 2 OSO 2 CH 2 CH 3 .

14. The solvent for non-aqueous electrolyte solutions according to claim 3 , comprising at least one fluorinated linear sulfone selected from the group consisting of the following compounds:

15. The solvent for non-aqueous electrolyte solutions according to claim 3 , comprising at least one fluorinated sulfonic acid ester selected from the group consisting of fluorinated linear sulfonic acid esters HCF 2 CF 2 CH 2 OSO 2 CH 3 , HCF 2 CF 2 CH 2 OSO 2 CH 2 CH 3 , CF 3 CH 2 OSO 2 CH 2 CH 3 , CF 3 CF 2 CH 2 OSO 2 CH 3 , and CF 3 CF 2 CH 2 OSO 2 CH 2 CH 3 .

Assignees

• Koh Meiten
• Sakata Hideo
• Nakazawa Hitomi
• Sawaki Kyouhei
• Sanagi Tomoyo
• Yamauchi Akiyoshi
• Nakazono Aoi
• Tani Akinori
• Tomita Masahiro
• Adachi Yuki
• Daikin Ind Ltd

Inventors

• Koh Meiten
• Sakata Hideo
• Nakazawa Hitomi
• Sawaki Kyouhei
• Sanagi Tomoyo
• Yamauchi Akiyoshi
• Nakazono Aoi
• Tani Akinori
• Tomita Masahiro
• Adachi Yuki

Classifications

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/0525

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

• H01G11/62

  characterised by the solute, e.g. salts, anions or cations therein · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title