Lithium ion battery

Patent metadata

Field	Value
Publication number	US-9620812-B2
Application number	US-201213977842-A
Country	US
Kind code	B2
Filing date	Mar 2, 2012
Priority date	Mar 3, 2011
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

There is provided a lithium ion battery having high flame retardancy and good cycle characteristics on a long-term basis. The lithium ion battery according to this exemplary embodiment is a lithium ion battery comprising a nonaqueous electrolytic solution or gel electrolyte containing a Li salt and an oxoacid ester derivative of phosphoric acid; a group of stacked electrode in which positive electrodes comprising a positive electrode layer comprising a positive electrode active material disposed on at least one surface of a positive electrode current collector, and negative electrodes comprising a negative electrode layer comprising a negative electrode active material disposed on at least one surface of a negative electrode current collector are alternately stacked via separators; and a package containing the nonaqueous electrolytic solution or gel electrolyte and the group of stacked electrode, wherein both of two electrodes A disposed on outermost sides of the group of stacked electrode, respectively, satisfy 0≦(Wc/Wb)≦0.55 when a mass of an electrode active material contained in an electrode active material-coated layer B disposed on a group-of-stacked-electrodes side of an electrode current collector is Wb, and a mass of an electrode active material contained in an electrode active material-coated layer C disposed on a package side of the electrode current collector is Wc.

First claim

The invention claimed is:

1. A lithium on battery comprising: a nonaqueous electrolytic solution or gel electrolyte comprising at least a Li salt and at least one oxoacid ester derivative of phosphoric acid selected from the following group (2)
a group of stacked electrode in which positive electrodes comprising a positive electrode layer comprising a positive electrode active material disposed on at least one surface of a positive electrode current collector, and negative electrodes comprising a negative electrode layer comprising a negative electrode active material disposed on at least one surface of a negative electrode current collector are alternately stacked via separators; and
a package comprising the nonaqueous electrolytic solution or the del electrolyte and the group of stacked electrode, wherein
both of two electrodes A disposed on outermost sides of the group of stacked electrode, respectively, satisfy 0<(Wc/Wb)≦0.55 when a mass of an electrode active material comprised in an electrode active material-coated layer B disposed on a group-of-stacked-electrodes side of the electrode current collector is Wb (g), and a mass of an electrode active material comprised in an electrode active material-coated layer C disposed on a package side of the electrode current collector is We (g), and
the oxoacid ester derivative of phosphoric acid selected from the group (2) is a compound selected from the group consisting of methyl ethyl fluorophosphonate, methyl propyl fluorophosphonate, methyl butyl fluorophosphonate, ethyl methyl fluorophosphonate, propyl methyl fluorophosphonate, butyl methyl fluorophosphonate, ethyl propyl fluorophosphonate, ethyl butyl fluorophosphonate, propyl butyl fluorophosphonate, methyl trifluoroethyl fluorophosphonate, ethyl trifluoroethyl fluorophosphonate, propyl trifluoroethyl fluorophosphonate, di(pentafluoropropyl) fluorophosphonate, methyl pentafluoropropyl fluorophosphonate, ethyl pentafluoropropyl fluorophosphonate; butyl pentafluoropropyl fluorophosphonate, ethyl fluorophenyl fluorophosphonate, methyl fluoroethylene fluorophosphonate, and fluoroethyl fluoropropyl fluorophosphonate.

2. The lithium on battery according to claim 1 , wherein both of the two electrodes A satisfy 0<(Wc/Wb)≦0.03.

3. The lithium ion battery according to claim 1 , wherein the nonaqueous electrolytic solution or the gel electrolyte comprises 5 to 60% by mass of the oxoacid ester derivative of phosphoric acid.

4. The lithium ion battery according to claim 1 , wherein the nonaqueous electrolytic solution or the gel electrolyte further comprises at least one of disulfonate esters represented by the following formulas (4) and (5):

wherein 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 comprises an ether bond and may be branched, a substituted or unsubstituted perfluoroalkylene group having 1 to 6 carbon atoms which comprises an ether bond and may be branched, or a substituted or unsubstituted fluoroalkylene group having 2 to 6 carbon atoms which comprises 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,

wherein R 6 and R 9 each independently represent an atom or group selected from the group consisting of a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms, a substituted or unsubstituted fluoroalkyl group having 1 to 5 carbon atoms, a polyfluoroalkyl group having 1 to 5 carbon atoms, —SO 2 X 3 , where X 3 is a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, —SY 1 , where Y 1 is a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, —COZ, where Z is a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, and a halogen atom; and R 7 and R 8 each independently represent an atom or group selected from the group consisting of a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms, a substituted or unsubstituted phenoxy group, a substituted or unsubstituted fluoroalkyl group having 1 to 5 carbon atoms, a polyfluoroalkyl group having 1 to 5 carbon atoms, a substituted or unsubstituted fluoroalkoxy group having 1 to 5 carbon atoms, a polyfluoroalkoxy group having 1 to 5 carbon atoms, a hydroxyl group, a halogen atom, —NX 4 X 5 , where X 4 and X 5 are each independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, and —NY 2 CONY 3 Y 4 , where Y 2 to Y 4 are each independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms.

5. The lithium ion battery according to claim 1 , wherein the package is a laminate package.

6. The lithium ion battery according to claim 2 , wherein the nonaqueous electrolytic solution or the gel electrolyte comprises 5 to 60% by mass of the oxoacid ester derivative of phosphoric acid.

7. The lithium ion battery according to claim 2 , wherein the nonaqueous electrolytic solution or the gel electrolyte further comprises at least one of disulfonate esters represented by the following formulas (4) and (5):

wherein 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 comprises an ether bond and may be branched, a substituted or unsubstituted perfluoroalkylene group having 1 to 6 carbon atoms which comprises an ether bond and may be branched, or a substituted or unsubstituted fluoroalkylene group having 2 to 6 carbon atoms which comprises 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,

wherein R 6 and R 9 each independently represent an atom or group selected from the group consisting of a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms, a substituted or unsubstituted fluoroalkyl group having 1 to 5 carbon atoms, a polyfluoroalkyl group having 1 to 5 carbon atoms, —SO 2 X 3 , where X 3 is a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, —SY 1 , where Y 1 is a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, —COZ, where Z is a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, and a

Assignees

• Kaneko Shinako
• Ishikawa Hitoshi
• Nec Energy Devices Ltd

Inventors

• Kaneko Shinako
• Ishikawa Hitoshi

Classifications

• H01M4/13 Primary

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M10/056 Primary

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M10/0565

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

• H01M10/0567

  characterised by the additives · CPC title