Electrolyte solution and method for producing sulfate salt

Patent metadata

Field	Value
Publication number	US-10374257-B2
Application number	US-201515324958-A
Country	US
Kind code	B2
Filing date	Jul 8, 2015
Priority date	Jul 16, 2014
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

An electrolyte solution capable of providing electrochemical devices whose internal resistance is less likely to increase even after repeated charge and discharge and whose cycle capacity retention ratio is high. The electrolyte solution contains a solvent, an electrolyte salt, and at least one selected from the group consisting of compounds represented by R11X11—SO3M11 and compounds represented by R21R22N—SO3M21 in an amount of 0.001 to 10 mass % relative to the solvent.

First claim

The invention claimed is:

1. An electrolyte solution comprising:
a solvent;
an electrolyte salt; and
at least one selected from the group consisting of compounds represented by the following formula (1) and compounds represented by the following formula (2) in an amount of 0.001 to 10 mass% relative to the solvent,
the solvent containing a fluorinated acyclic carbonate,
the formula (1) being R 11 X 11 —SO 3 M 11

wherein R 11 is a C1-C6 linear or branched alkyl group, a C2-C6 linear or branched alkenyl group, a C2-C6 linear or branched alkynyl group, a C3-C6 cycloalkyl group, a C3-C6 cycloalkenyl group, or a C3-C6 alkylsilyl group, the alkyl group, the cycloalkyl group, and the alkylsilyl group may have a halogen atom which substitutes for a hydrogen atom bonding to a carbon atom, may have a cyclic structure, and may have an ether bond or a thioether bond; X 11 is O or S; and M 11 is at least one selected from the group consisting of Li, Na, K, and Cs, and
the formula (2) being R 21 R 22 N—SO 3 M 21

wherein R 21 and R 22 may be the same as or different from each other, and are individually a C1-C6 linear or branched alkyl group, a C2-C6 linear or branched alkenyl group, a C2-C6 linear or branched alkynyl group, a C3-C6 cycloalkyl group, a C3-C6 cycloalkenyl group, or a C3-C6 alkylsilyl group, the alkyl group, the cycloalkyl group, and the alkylsilyl group may have a halogen atom which substitutes for a hydrogen atom bonding to a carbon atom, may have a cyclic structure, and R 21 and R 22 may bond to each other to form a cyclic structure; and M 21 is at least one selected from the group consisting of Li, Na, K, and Cs.

2. The electrolyte solution according to claim 1 ,
wherein, in the formula (1), R 11 is a C1-C6 linear or branched alkyl group or a C3-C6 cycloalkyl group; X 11 is O; and M 11 is Li.

3. The electrolyte solution according to claim 1 ,
wherein, in the formula (2), R 21 and R 22 may be the same as or different from each other, and are individually a C1-C6 linear or branched alkyl group or a C3-C6 cycloalkyl group; and M 21 is Li.

4. The electrolyte solution according to claim 1 ,
wherein the electrolyte salt is at least one lithium salt selected from the group consisting of LiPF 6 , LiBF 4 , LiSO 3 CF 3 , LiN(SO 2 CF 3 ) 2 , LiN(SO 2 C 2 F 5 ) 2 , lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, and salts represented by LiPF a (C n F 2n+1 ) 6−a , where a is an integer of 0 to 5; and n is an integer of 1 to 6.

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

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

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

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

Assignees

• Daikin Ind Ltd

Inventors

• Maruo Atsushi
• Sakata Hideo
• Kinoshita Shinichi

Classifications

• H01M10/0525

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

• H01G11/64

  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

• H01M2300/0034

  Fluorinated solvents · CPC title