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

Patent metadata

Field	Value
Publication number	US-2020243911-A1
Application number	US-201816636700-A
Country	US
Kind code	A1
Filing date	Jul 31, 2018
Priority date	Aug 7, 2017
Publication date	Jul 30, 2020
Grant date	—

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

1 . An electrolyte solution comprising lithium fluorosulfonate and a solvent comprising a compound (1) represented by the following formula (1):
CF 2 HCOOCH 3 .

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 1 ,
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