Hydrofluoroether compound, nonaqueous electrolyte solution and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-10374259-B2
Application number	US-201615560807-A
Country	US
Kind code	B2
Filing date	Mar 2, 2016
Priority date	Mar 25, 2015
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

A nonaqueous electrolyte solution including a hydrofluoroether compound represented by the following formula (1):

[Formula 1]

CF 3 CF 2 CF 2 OCHFCF 2 OR 1   (1)

wherein R 1 represents a difluoromethyl group, a 2,2-difluoroethyl group, a 2,2,2-trifluoroethyl group, a 2,2,3,3,3-pentafluoropropyl group, a 2,2,3,3-tetrafluoropropyl group, a 1,1,1,3,3,3-hexafluoroisopropyl group, a 2,2,3,3,4,4,4-heptafluorobutyl group, a 2,2,3,3,4,4-hexafluorobutyl group, or a 2,2,3,3,4,4,5,5-octafluoropentyl group.

First claim

The invention claimed is:

1. A nonaqueous electrolyte solution for a lithium ion secondary battery, comprising:
an electrolytic salt; and
a hydrofluoroether compound represented by the following formula (1):
[Formula 1]
CF 3 CF 2 CF 2 OCHFCF 2 OR 1   (1)

wherein R 1 represents a difluoromethyl group, a 2,2-difluoroethyl group, a 2,2,2-trifluoroethyl group, a 2,2,3,3,3-pentafluoropropyl group, a 2,2,3,3-tetrafluoropropyl group, a 1,1,1,3,3,3-hexafluoroisopropyl group, a 2,2,3,3,4,4,4-heptafluorobutyl group, a 2,2,3,3,4,4-hexafluorobutyl group, or a 2,2,3,3,4,4,5,5-octafluoropentyl group.

2. The nonaqueous electrolyte solution according to claim 1 , further comprising at least one of a chain carbonate and a cyclic carbonate.

3. The nonaqueous electrolyte solution according to claim 2 , wherein the chain carbonate is at least one compound selected from the group consisting of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate, dibutyl carbonate, methyl propyl carbonate, methyl isopropyl carbonate, methyl butyl carbonate, fluoromethyl methyl carbonate, 2-fluoroethyl methyl carbonate, ethyl-(2-fluoroethyl) carbonate, ethyl-(2,2-difluoroethyl) carbonate, bis(2-fluoroethyl) carbonate and ethyl-(2,2,2-trifluoroethyl) carbonate; and
the cyclic carbonate is at least one compound selected from the group consisting of ethylene carbonate, propylene carbonate, fluoroethylene carbonate, butyl ene carbonate, vinylene carbonate and vinyl ethylene carbonate.

4. The nonaqueous electrolyte solution according to claim 1 , comprising a cyclic carbonate.

5. The nonaqueous electrolyte solution according to claim 1 , further comprising at least one of a fluorine-containing ether represented by the following formula (2) and a fluorine-containing phosphate ester represented by the following formula (3):
[Formula 2]
R 2 —O—R 3   (2)

wherein R 2 and R 3 are each independently an alkyl group or a fluorine-containing alkyl group, and at least one of R 2 and R 3 is a fluorine-containing alkyl group, and

wherein R 4 , R 5 and R 6 are each independently an alkyl group or a fluorine-containing alkyl group, and at least one of R 4 , R 5 and R 6 is a fluorine-containing alkyl group.

6. The nonaqueous electrolyte solution according to claim 1 , wherein a content of the hydrofluoroether compound represented by the formula (1) is 1% by volume to 60% by volume with respect to the whole of nonaqueous solvents in the nonaqueous electrolyte solution.

7. A lithium ion secondary battery, comprising a positive electrode containing a positive electrode active substance material capable of occluding and releasing lithium ions, a negative electrode containing a negative electrode active substance material capable of occluding and releasing lithium ions, and a nonaqueous electrolyte solution, wherein the nonaqueous electrolyte solution is the nonaqueous electrolyte solution according to claim 1 .

8. The lithium ion secondary battery according to claim 7 , wherein the positive electrode active substance material comprises a lithium metal composite oxide.

9. The lithium ion secondary battery according to claim 7 , wherein the negative electrode active substance material comprises at least one of elemental silicon, silicon oxides and a carbonaceous material.

10. The nonaqueous electrolyte solution according to claim 1 , wherein the electrolytic salt comprises a lithium salt.

11. The nonaqueous electrolyte solution according to claim 1 , wherein the electrolytic salt comprises at least one selected from the group consisting of LiPF 6 , LiBF 4 , LiN(SO 2 F) 2 , LiN(SO 2 CF 3 ) 2 and LiN(SO 2 C 2 F 5 ) 2 .

12. A hydrofluoroether compound, represented by the following formula (1):
[Formula 4]
CF 3 CF 2 CF 2 OCHFCF 2 OR 1   (1)

wherein R 1 represents a difluoromethyl group, a 2,2-difluoroethyl group, a 2,2,3,3,3-pentafluoropropyl group, a 2,2,3,3-tetrafluoropropyl group, a 1,1,1,3,3,3-hexafluoroisopropyl group, a 2,2,3,3,4,4,4-heptafluorobutyl group, a 2,2,3,3,4,4-hexafluorobutyl group, or a 2,2,3,3,4,4,5,5-octafluoropentyl group.

Assignees

• Nec Corp

Inventors

• Maeda Katsumi

Classifications

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01M10/0567

  characterised by the additives · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title