Electrolytic solution, electrochemical device, secondary cell, and module

Patent metadata

Field	Value
Publication number	US-11631894-B2
Application number	US-201816626755-A
Country	US
Kind code	B2
Filing date	May 30, 2018
Priority date	Jun 30, 2017
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

An electrolyte solution containing at least one selected from a compound (I) represented by the following formula (I) and specific compounds (II). The formula (I) is as follows:wherein R11 is a C2-C6 alkyl group. Also disclosed are a secondary battery containing the electrolyte solution and a module including the electrochemical device or the secondary battery.

First claim

The invention claimed is:

1. An electrolyte solution comprising a solvent and further comprising additives, the additives comprising:
a compound (I) in an amount of 0.001 to 10% by mass relative to the solvent represented by the following formula (I); and
at least one compound (II) in an amount of 0.001 to 10% by mass relative to the solvent selected from the group consisting of a compound (a) represented by the following formula (a), a compound (b) represented by the following formula (b), a compound (c) represented by the following formula (c), and a compound (d) represented by the following formula (d),
the formula (I) being:

wherein R 11 is a C2-C6 alkyl group,
the formula (a) being:

wherein R 12 and R 13 are each individually a fluorine atom, or a C1-C3 alkyl group where one or more carbon atoms constituting the C1-C3 alkyl group is optionally substituted with a fluorine atom, or a C1-C3 alkyl group containing a hetero atom comprising oxygen, nitrogen, sulfur, or a phosphorous atom, or they are C1-C3 alkylene groups which bind to each other to form a ring together with a boron atom, where one or more carbon atoms constituting one or both of the C1-C3 alkylene groups is optionally substituted with a fluorine atom, or where one or both of the C1-C3 alkylene groups optionally contains a substituent comprising a methylidene group or an ethylidene group, or where one or both of the C1-C3 alkylene groups optionally contains a hetero atom comprising oxygen, nitrogen, sulfur, or a phosphorous atom,
the formula (b) being:

wherein Rf 11 is a C2-C6 alkyl group where one or more of carbon atoms constituting the C2-C6 alkyl group is optionally substituted with a fluorine atom,
the formula (c) being:

wherein Rf 12 is a fluorine atom or a C1-C6 alkyl group where one or more of the carbon atoms constituting the C1-C6 alkyl group is optionally substituted with a fluorine atom,
the formula (d) being:

wherein R 14 is a fluorine atom, or a C1-C3 alkyl group where one or more of the carbon atoms constituting the C1-C3 alkyl group is substituted with a fluorine atom, and
wherein the solvent contains at least one selected from the group consisting of a non-fluorinated saturated cyclic carbonate other than the compound (b), a fluorinated saturated cyclic carbonate other than the compound (b), a non-fluorinated acyclic carbonate, a fluorinated acyclic carbonate, a non-fluorinated acyclic ester, and a fluorinated acyclic ester.

2. The electrolyte solution according to claim 1 ,
wherein the compound (I) is represented by the following formula:

3. The electrolyte solution according to claim 1 , further comprising an electrolyte salt other than the compound (a).

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

5. A module comprising the electrochemical device according to claim 4 or the secondary battery.

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

7. A module comprising the secondary battery according to claim 6 .

Assignees

• Daikin Ind Ltd

Inventors

• Hidaka Tomoya
• Takahashi Kenzou
• Kinoshita Masakazu
• Yamazaki Shigeaki

Classifications

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0525 Primary

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

• H01G9/035

  Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence) · CPC title

• H01G11/60

  characterised by the solvent · CPC title

• H01G11/64

  characterised by additives · CPC title