Gel electrolyte and polymer secondary battery using same

Patent metadata

Field	Value
Publication number	US-9899703-B2
Application number	US-201414771684-A
Country	US
Kind code	B2
Filing date	Feb 28, 2014
Priority date	Mar 1, 2013
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

The present invention relates to a gel electrolyte comprising a cyclic sulfonic acid ester represented by formula (1). According to the present invention, it is possible to provide a gel electrolyte capable of suppressing the self-discharge of a polymer secondary battery, and a polymer secondary battery using the gel electrolyte.

wherein R 1 and R 2 are each independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, a halogen group or an amino group with the proviso that R 1 and R 2 are not hydrogen atoms at the same time; R 3 represents a linkage group selected from the group consisting of an alkylene group having 1 to 5 carbon atoms, a carbonyl group, a sulfonyl group, a fluoroalkylene group having 1 to 6 carbon atoms, and a divalent group having 2 to 6 carbon atoms in which alkylene units or fluoroalkylene units are bonded through an ether group.

First claim

The invention claimed is:

1. A gel electrolyte comprising a cyclic sulfonic acid ester represented by the general formula (1):

wherein in the general formula (1), R 1 is a hydrogen atom, R 2 is —C m H 2m+1 (m=1, 2 or 3) and R 3 is —CH 2 .

2. The gel electrolyte according to claim 1 , further comprising a compound having one or more sulfonyl groups in addition to the cyclic sulfonic acid ester represented by the general formula (1).

3. The gel electrolyte according to claim 2 , comprising, as the compound having a sulfonyl group, a sultone compound represented by the following general formula (2):

wherein in the general formula (2), n is an integer of 0 or more and 2 or less; and R 1 to R 6 are each independently selected from the group consisting of a hydrogen atom, an alkyl group having 1 or more and 12 or less carbon atoms, a cycloalkyl group having 3 or more and 6 or less carbon atoms and an aryl group having 6 or more and 12 or less carbon atoms.

4. The gel electrolyte according to claim 1 , wherein the cyclic sulfonic acid ester represented by the general formula (1) is included in a content of 0.005% by mass or more and 10% by mass or less in relation to the total mass of the gel electrolyte.

5. The gel electrolyte according to claim 1 , further comprising a vinylene carbonate or a derivative thereof.

6. The gel electrolyte according to claim 1 , comprising one or two or more polymers selected from the group consisting of poly(meth)acrylate, polyvinylidene fluoride, polyacrylonitrile and polyethylene oxide.

7. The gel electrolyte according to claim 1 , comprising, as a nonaqueous solvent, one or more solvents selected from the group consisting of cyclic carbonates, linear carbonates, aliphatic carboxylic acid esters, γ-lactones, cyclic ethers, linear ethers and the fluorine derivatives of these compounds.

8. The gel electrolyte according to claim 1 , comprising, as a lithium salt, one or more materials selected from the group consisting of LiPF 6 , LiBF 4 , LiAsF 6 , LiSbF 6 , LiClO 4 , LiAlCl 4 , and LiN(C n F 2n+1 SO 2 )(C m F 2m+1 SO 2 ) (n and m are each independently a natural number).

9. A polymer secondary battery comprising the gel electrolyte according to claim 1 in a secondary battery comprising at least a positive electrode and a negative electrode.

10. The polymer secondary battery according to claim 9 , comprising, as a positive electrode active material, a lithium-containing composite oxide.

11. The polymer secondary battery according to claim 9 , comprising, as a negative electrode active material, one or more materials selected from the group consisting of a material capable of occluding and releasing lithium, lithium metal, a metal material capable of forming an alloy with lithium and an oxide material.

12. The polymer secondary battery according to claim 11 , comprising, as the negative electrode active material, a carbon material.

13. The polymer secondary battery according to claim 12 , wherein the carbon material is graphite.

14. The polymer secondary battery according to claim 12 , wherein the carbon material is amorphous carbon.

15. The polymer secondary battery according to claim 9 , comprising a film outer package.

16. A battery for a vehicle comprising the secondary battery according to claim 9 .

17. A vehicle using the battery for a vehicle according to claim 16 .

Assignees

• Nec Corp
• Nec Energy Devices Ltd

Inventors

• Yoshida Noboru
• Shimanuki Ikiko
• Kaneko Shinako
• Ishikawa Hitoshi

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• H01M10/0565 Primary

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title