Nonaqueous electrolyte solution, and lithium ion secondary battery having the same

Patent metadata

Field	Value
Publication number	US-9312073-B2
Application number	US-201113578209-A
Country	US
Kind code	B2
Filing date	Feb 10, 2011
Priority date	Feb 10, 2010
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

The exemplary embodiment has an object to provide a nonaqueous electrolyte solution having a flame retardancy over a long period and having a good capacity maintenance rate. The exemplary embodiment is a nonaqueous electrolyte solution containing a lithium salt, at least one oxo-acid ester derivative of phosphorus selected from compounds represented by a predetermined formula, and at least one disulfonate ester selected from a cyclic disulfonate ester and a linear disulfonate ester represented by the predetermined formulae.

First claim

The invention claimed is:

1. A nonaqueous electrolyte solution, comprising:
a lithium salt;
at least one oxo-acid ester derivative of phosphorus represented by formula (1) present in an amount of 20% by mass or more and 60% by mass or less;
at least one disulfonate ester represented by formula (4) present in an amount of 0.05% by mass or more and 10% by mass or less;
at least one aprotic solvent selected from cyclic carbonates and linear carbonates present in a remaining amount; and
0.5% by mass or more and 20% by mass or less of a cyclic carbonate ester containing a halogen:

in formula (1), R 11 , R 12 , and R 13 each independently represent any group selected from a halogen-substituted alkyl group, a halogen-substituted aryl group, a halogen-substituted alkenyl group, a halogen-substituted phenyl group, a halogen-substituted amino group, a halogen-substituted alkoxy group and a halogen-substituted cycloalkyl group; and any two or all of R 11 , R 12 , and R 13 may be bonded to form a cyclic structure, and

in formula (4), Q represents an oxygen atom, a methylene group or a single bond; A 1 represents a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms which may be branched, a carbonyl group, a sulfinyl group, a substituted or unsubstituted perfluoroalkylene group having 1 to 5 carbon atoms which may be branched, a substituted or unsubstituted fluoroalkylene group having 2 to 6 carbon atoms which may be branched, a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms which contains an ether bond and may be branched, a substituted or unsubstituted perfluoroalkylene group having 1 to 6 carbon atoms which contains an ether bond and may be branched, or a substituted or unsubstituted fluoroalkylene group having 2 to 6 carbon atoms which contains an ether bond and may be branched; and A 2 represents a substituted or unsubstituted alkylene group, a substituted or unsubstituted fluoroalkylene group, or an oxygen atom.

2. The nonaqueous electrolyte solution according to claim 1 , wherein the nonaqueous electrolyte solution is gelated with a polymer component or a polymer.

3. A lithium ion secondary battery, comprising a nonaqueous electrolyte solution according to claim 1 .

4. A capacitor, comprising a nonaqueous electrolyte solution according to claim 1 .

5. The nonaqueous electrolyte solution according to claim 1 , wherein the nonaqueous electrolyte solution is gelated with a polymer component or a polymer.

6. The nonaqueous electrolyte solution according to claim 1 , wherein the cyclic carbonate ester containing a halogen is a fluorine-containing carbonate.

7. The nonaqueous electrolyte solution according to claim 1 , wherein the aprotic solvent is selected from propylene carbonate, ethylene carbonate, vinylene carbonate, dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate.

8. A nonaqueous electrolyte solution, comprising:
a lithium salt;
at least one oxo-acid ester derivative of phosphorus selected from compounds represented by formulae (2) and (3) present in an amount of 20% by mass or more and 60% by mass or less;
at least one disulfonate ester represented by formula (4); and
0.5% by mass or more and 20% by mass or less of a cyclic carbonate ester containing a halogen:

in formula (2), R 21 and R 22 each independently represent any group selected from an alkyl group, an aryl group, an alkenyl group, a cyano group, a phenyl group, an amino group, a nitro group, an alkoxy group and a cycloalkyl group, and a halogen-substituted group thereof; R 21 and R 22 may be bonded to form a cyclic structure; and X 21 represents a halogen atom,

in formula (3), R 31 represents any group selected from an alkyl group, an aryl group, an alkenyl group, a cyano group, a phenyl group, an amino group, a nitro group, an alkoxy group and a cycloalkyl group, and a halogen-substituted group thereof; and X 31 and X 32 each independently represent a halogen atom,

in formula (4), Q represents an oxygen atom, a methylene group or a single bond; A 1 represents a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms which may be branched, a carbonyl group, a sulfinyl group, a substituted or unsubstituted perfluoroalkylene group having 1 to 5 carbon atoms which may be branched, a substituted or unsubstituted fluoroalkylene group having 2 to 6 carbon atoms which may be branched, a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms which contains an ether bond and may be branched, a substituted or unsubstituted perfluoroalkylene group having 1 to 6 carbon atoms which contains an ether bond and may be branched, or a substituted or unsubstituted fluoroalkylene group having 2 to 6 carbon atoms which contains an ether bond and may be branched; and A 2 represents a substituted or unsubstituted alkylene group, a substituted or unsubstituted fluoroalkylene group, or an oxygen atom.

9. The nonaqueous electrolyte solution according to claim 8 ,
comprising 0.05% by mass or more and 10% by mass or less of the disulfonate ester.

10. A lithium ion secondary battery, comprising a nonaqueous electrolyte solution according to claim 8 .

11. A capacitor, comprising a nonaqueous electrolyte solution according to claim 8 .

12. A nonaqueous electrolyte solution, comprising:
a lithium salt;
tri(trifluoroethyl) phosphate present in an amount of 20% by mass or more and 60% by mass or less;
at least one disulfonate ester represented by formula (4) in an amount of 0.05% by mass or more and 10% by mass or less; and
at least one aprotic solvent selected from cyclic carbonates and linear carbonates in a remaining amount:

in the formula (4), Q represents an oxygen atom, a methylene group or a single bond; A 1 represents a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms which may be branched, a carbonyl group, a sulfinyl group, a substituted or unsubstituted perfluoroalkylene group having 1 to 5 carbon atoms which may be branched, a substituted or unsubstituted fluoroalkylene group having 2 to 6 carbon atoms which may be branched, a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms which contains an ether bond and may be branched, a substituted or unsubstituted perfluoroalkylene group having 1 to 6 carbon atoms which contains an ether bond and may be branched, or a substituted or unsubstituted fluoroalkylene group having 2 to 6 carbon atoms which contains an ether bond and may be branched; and A 2 represents a substituted or unsubstituted alkylene group, a substituted or unsubstituted fluoroalkylene group, or an oxygen atom.

Assignees

• Kaneko Shinako
• Ishikawa Hitoshi
• Hashizume Yoko
• Suzuki Eiji
• Nec Energy Devices Ltd

Inventors

• Kaneko Shinako
• Ishikawa Hitoshi
• Hashizume Yoko
• Suzuki Eiji

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title