Electrolyte, electrochemical device, secondary cell, and module

Patent metadata

Field	Value
Publication number	US-10256506-B2
Application number	US-201515117509-A
Country	US
Kind code	B2
Filing date	Mar 16, 2015
Priority date	Mar 28, 2014
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

Provided is an electrolyte solution for secondary batteries that are less likely to generate gas and excellent in high-temperature storage characteristics; an electrochemical device using the electrolyte solution; and a module using the electrochemical device. The electrolyte solution contains a solvent and an electrolyte salt, the solvent containing a fluorine-containing acyclic carbonate represented by the formula (1) and a fluorine-containing maleic anhydride represented by the formula (2). The electrolyte solution contains not less than 0.001 mass % but less than 90 vol % of the fluorine-containing acyclic carbonate, and the electrolyte solution contains 0.001 to 20 mass % of the fluorine-containing maleic anhydride.

First claim

The invention claimed is:

1. An electrolyte solution comprising a fluorine-containing acyclic carbonate represented by the formula (1), a fluorine-containing maleic anhydride represented by the formula (2), and an electrolyte salt,
the electrolyte solution containing not less than 0.001 mass % but less than 90 vol % of the fluorine-containing acyclic carbonate,
the electrolyte solution containing 0.001 to 20 mass % of the fluorine-containing maleic anhydride, the formula (1) being:
Rf 1 OCOORf 2   (1)

wherein Rf 1 and Rf 2 are the same as or different from each other and individually represent a C1-C4 alkyl group or a C1-C4 fluorine-containing alkyl group, but at least one of Rf 1 and Rf 2 is C1-C4 fluorine-containing alkyl group, the formula (2) being:

wherein Rf 3 and Rf 4 are the same as or different from each other and individually represent a hydrogen atom, a fluorine atom, or a C1-C10 fluorine-containing alkyl group, but both of Rf 3 and Rf 4 are not hydrogen atoms.

2. The electrolyte solution according to claim 1 ,
wherein the fluorine-containing acyclic carbonate is at least one selected from the group consisting of CF 3 CH 2 OCOOCH 2 CF 3 , CF 3 CH 2 OCOOCH 3 , and CF 3 CF 2 CH 2 OCOOCH 2 CF 2 CF 3 .

3. The electrolyte solution according to claim 1 ,
wherein the fluorine-containing maleic anhydride is a compound represented by the following formula (3) or (4):

4. The electrolyte solution according to claim 1 ,
further comprising at least one selected from the group consisting of a non-fluorinated saturated cyclic carbonate, a fluorinated saturated cyclic carbonate, and a non-fluorinated acyclic carbonate.

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

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

7. A module comprising the electrochemical device according to claim 6 .

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

9. A module comprising the electrochemical device according to claim 8 .

Assignees

• Daikin Ind Ltd

Inventors

• Taeda Mayuko
• Yamazaki Shigeaki
• Arima Hiroyuki
• Miura Toshirou
• SHIMADA Tomo
• Kinoshita Shinichi

Classifications

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M10/0565

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

• H01M2300/0034

  Fluorinated solvents · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M10/0568

  characterised by the solutes · CPC title