Electrolyte solution, electrochemical device, secondary battery, and module

Patent metadata

Field	Value
Publication number	US-11322780-B2
Application number	US-201716319135-A
Country	US
Kind code	B2
Filing date	Jun 16, 2017
Priority date	Jul 22, 2016
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

An electrolyte solution for an electrochemical device, such as a lithium secondary battery, or module. The electrolyte solution contains: a solvent that contains a fluorinated acyclic carbonate having a fluorine content of 33 to 70 mass %; at least one organosilicon compound selected from a compound represented by the formula (1): (R11)n11—M11—O—SiR12R13R14 and a compound represented by the formula (2): R21R22R23—Si—F; a lithium salt (3) that contains an oxalato-complex as an anion; and a lithium salt (4) represented by the formula (4): LizM31FxOy, where R11, M11, R12, R13, R14, R21, R22, R23 and M31 are as defined herein.

First claim

The invention claimed is:

1. An electrolyte solution comprising:
a solvent that contains a fluorinated acyclic carbonate having a fluorine content of 36.1 to 50.4 mass %;
an organosilicon compound selected from the group consisting tris(trimethylsilyl) phosphate, tris(trimethylsilyl) phosphite, tris(trimethylsilyl) borate, trimethylsilyl fluoride, and triethylsilyl fluoride;
a lithium salt (3) selected from the group consisting of lithium bis(oxalato)borate, lithium difluoro(oxalato)borate, and lithium tetrafluoro(oxalato)phosphate, and
a lithium salt (4) selected from the group consisting of LiPO 2 F 2 , LiAsO 2 F 2 , and LiSbO 2 F 2 ,
wherein the electrolyte solution contains 0.001 to 3 mass % of the organosilicon compound, 0.001 to 1 mass % of the lithium salt (3) and 0.001 to 1 mass % of the lithium salt (4), relative to the solvent.

2. The electrolyte solution according to claim 1 ,
wherein the electrolyte solution contains 5 to 85 vol % of the fluorinated acyclic carbonate relative to the solvent.

3. The electrolyte solution according to claim 1 ,
wherein the solvent further contains a fluorinated saturated cyclic carbonate.

4. The electrolyte solution according to claim 3 ,
wherein the electrolyte solution contains 15 to 95 vol % of the fluorinated saturated cyclic carbonate relative to the solvent.

5. The electrolyte solution according to claim 3 ,
wherein the electrolyte solution contains 40 to 100 vol % in total of the fluorinated saturated cyclic carbonate and the fluorinated acyclic carbonate relative to the solvent.

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 secondary battery according to claim 8 .

Assignees

• Daikin Ind Ltd

Inventors

• Sakata Hideo
• Takahashi Kenzou
• Arima Hiroyuki
• Yamazaki Shigeaki
• Kinoshita Shinichi

Classifications

• H01G9/20

  Light-sensitive devices · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01G11/62

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

• H01M10/0567

  characterised by the additives · CPC title

• H01G11/64

  characterised by additives · CPC title