Electrolyte solution, electrochemical device, lithium ion secondary battery, and module

Patent metadata

Field	Value
Publication number	US-11201353-B2
Application number	US-201716470608-A
Country	US
Kind code	B2
Filing date	Nov 21, 2017
Priority date	Dec 20, 2016
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

An electrolyte solution applicable to high-voltage electrochemical devices and capable of improving the cycle characteristics of electrochemical devices even at high voltage, and an electrochemical device. The electrolyte solution contains a fluorinated diether and a metal salt having a specific structure. The fluorinated diether is represented by CFR 11 R 12 —O—CH 2 CH 2 —O—R 13 , wherein R 11 and R 12 are each individually H, CH 3 , F, CH 2 F, CHF 2 , or CF 3 ; and R 13 is a C1 or C2 non-fluorinated alkyl group or a C1 or C2 fluorinated alkyl group.

First claim

The invention claimed is:

1. An electrolyte solution comprising:
a solvent; and
a compound (2),
the solvent containing a fluorinated diether (1) represented by the following (1):

wherein R 11 and R 12 are each individually H or F; and R 13 is CH 3 , CH 2 F, CHF 2 , or CF 3 ,
the compound (2) being represented by the following formula (2):

wherein
A a+ is a lithium ion;
a is 1;
b is 1;
p is b/a;
n 23 is 1 or 2;
n 21 is 0, 2, or 4;
Z 21 is B or P;
L 21 is a fluorine atom;
Y 21 and Y 22 are O.

2. The electrolyte solution according to claim 1 ,
wherein the solvent contains 5% by volume or more of the fluorinated diether (1).

3. The electrolyte solution according to claim 1 ,
wherein the solvent further contains at least one compound (3) selected from the group consisting of a fluorinated carbonate and a fluorinated acyclic ester.

4. The electrolyte solution according to claim 3 ,
wherein the solvent contains 6 to 80% by volume of the fluorinated diether (1) and 20 to 94% by volume of the compound (3), and the electrolyte solution contains 0.01 to 10% by mass of the compound (2) relative to the solvent.

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

6. A lithium-ion secondary battery comprising the electrolyte solution according to claim 1 .

7. A module comprising the electrochemical device according to claim 5 .

8. A module comprising the lithium ion secondary battery according to claim 6 .

Assignees

• Daikin Ind Ltd

Inventors

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

Classifications

• H01M10/0569

  characterised by the solvents · CPC title

• H01G11/60

  characterised by the solvent · CPC title

• H01M10/0525 Primary

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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title