Electrolytic solution, electrochemical device, lithium-ion secondary cell, and module

Patent metadata

Field	Value
Publication number	US-11605509-B2
Application number	US-201816500499-A
Country	US
Kind code	B2
Filing date	Mar 1, 2018
Priority date	Apr 4, 2017
Publication date	Mar 14, 2023
Grant date	Mar 14, 2023

Abstract

An electrolyte solution containing a solvent and a compound represented by the following formula (1), wherein R 1 is a C1-C5 linear or branched non-fluorinated alkyl group optionally containing an ether bond. Also disclosed is an electrochemical device including the electrolyte solution, a lithium ion secondary battery including the electrolyte solution and a module including the electrochemical device or lithium ion secondary battery.

First claim

The invention claimed is:

1. An electrolyte solution comprising:
a solvent;
a compound (1) represented by the following formula (1):

wherein R 1 is a C1-C5 linear or branched non-fluorinated alkyl group optionally containing an ether bond; and
hydrogen fluoride,
wherein the hydrogen fluoride is present in an amount of 5 to 200 ppm relative to the electrolyte solution,
wherein the solvent contains a non-fluorinated saturated cyclic carbonate and a non-fluorinated acyclic carbonate in a total amount of 20 to 100% by volume of the solvent; or the solvent contains a fluorinated saturated cyclic carbonate and a fluorinated acyclic carbonate in a total amount of 10 to 100% by volume of the solvent,
wherein the compound (1) is present in an amount of 0.001 to 1% by mass relative to the electrolyte solution,
wherein the non-fluorinated saturated cyclic carbonate includes non-fluorinated saturated cyclic carbonates containing a C2-C4 alkylene group,
wherein the non-fluorinated acyclic carbonate includes at least one selected from the group consisting of CH 3 OCOOCH 3 , CH 3 CH 2 OCOOCH 2 CH 3 , CH 3 CH 2 OCOOCH 3 , CH 3 OCOOCH 2 CH 2 CH 3 , methyl butyl carbonate, ethyl propyl carbonate, and ethyl butyl carbonate,
wherein when the solvent contains both the non-fluorinated acyclic carbonate and the non-fluorinated cyclic carbonate, the non-fluorinated cyclic carbonate and the non-fluorinated acyclic carbonate have a volume ratio of 5/95 to 95/5,
wherein the fluorinated saturated cyclic carbonate includes a compound represented by the following formula (A):

wherein X 1 to X 4 are the same as or different from each other, and are each —H, —CH 3 , —C 2 H 5 , —F, a fluorinated alkyl group optionally containing an ether bond, or a fluorinated alkoxy group optionally containing an ether bond; at least one of X 1 to X 4 is —F, a fluorinated alkyl group optionally containing an ether bond, or a fluorinated alkoxy group optionally containing an ether bond,
wherein the fluorinated acyclic carbonate includes a compound represented by the following formula (B):
Rf 2 OCOOR 6   (B)

wherein Rf 2 is a C1-C7 fluorinated alkyl group; and R 6 is a C1-C7 alkyl group optionally containing a fluorine atom, and
wherein when the solvent contains both the fluorinated acyclic carbonate and the fluorinated cyclic carbonate, the fluorinated cyclic carbonate and the fluorinated acyclic carbonate have a volume ratio of 5/95 to 95/5.

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

wherein R 2 and R 3 are the same as or different from each other, and are each a C1-C5 linear or branched non-fluorinated alkyl group optionally containing an ether bond.

3. The electrolyte solution according to claim 2 ,
wherein the compound (2) is present in an amount of 0.1 to 5% by mass relative to the electrolyte solution.

4. The electrolyte solution according to claim 1 , further comprising an electrolyte salt.

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
• Yamazaki Shigeaki
• Arima Hiroyuki

Classifications

• H01G11/64 Primary

  characterised by additives · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01G11/06

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title