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

Patent metadata

Field	Value
Publication number	US-11611106-B2
Application number	US-201816636700-A
Country	US
Kind code	B2
Filing date	Jul 31, 2018
Priority date	Aug 7, 2017
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

The invention provides an electrolyte solution capable of providing an electrochemical device having low resistance and excellent high-temperature storage characteristics and cycle characteristics. The electrolyte solution contains lithium fluorosulfonate and a solvent containing a compound (1) represented by the following formula (1): CF2HCOOCH3.

First claim

The invention claimed is:

1. An electrolyte solution comprising lithium fluorosulfonate and a solvent comprising a compound (1) represented by the following formula (1):
CF 2 HCOOCH 3 ,
wherein the compound (1) is included in an amount of 30-100% by volume of solvent.

2. The electrolyte solution according to claim 1 ,
wherein the solvent further comprises a fluorinated cyclic carbonate.

3. The electrolyte solution according to claim 1 ,
wherein the solvent further comprises a fluorinated acyclic carbonate.

4. The electrolyte solution according to claim 1 , further comprising a compound (2) represented by the following formula (2):

wherein X 21 is a group containing at least H or C; n 21 is an integer of 1 to 3; Y 21 and Z 21 are the same as or different from each other, and are each a group containing at least H, C, O, or F; n 22 is 0 or 1; and Y 21 and Z 21 optionally bind to each other to form a ring.

5. The electrolyte solution according to claim 4 ,
wherein the compound (2) includes at least one selected from the group consisting of:
a compound (3) represented by the following formula (3):

wherein X 31 to X 34 are the same as or different from each other, and are each a group containing at least H, C, O, or F;
a compound (4) represented by the following formula (4):

wherein X 41 and X 42 are the same as or different from each other, and are each a group containing at least H, C, O, or F; and
phthalic anhydride.

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

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

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

9. A module comprising the lithium ion secondary battery according to claim 7 .

Assignees

• Daikin Ind Ltd

Inventors

• Kuwajima Yoshiko
• Takahashi Kenzou
• Yamazaki Shigeaki
• Arima Hiroyuki
• Hidaka Tomoya
• Kinoshita Masakazu
• Nakamura Hisako
• Yamada Takaya
• Shimooka Toshiharu
• Suzuki Yuuki
• Ohtsuka Tatsuya

Classifications

• H01G11/64

  characterised by additives · CPC title

• H01G11/62

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

• H01G11/60

  characterised by the solvent · CPC title

• H01M10/0525

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

• H01M10/0567

  characterised by the additives · CPC title