# US 8,771,882 B2 · Method for producing electrolyte solution for lithium ion battery and lithium ion battery using same

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- Number: US 8,771,882 B2
- Document ID: US8771882B2
- Status: Granted
- Kind: B2
- Application number: 12/096,147
- Filed: 2006-11-07
- Published: 2009-12-17
- Granted: 2014-07-08
- Earliest claimed: 2005-12-06
- Assignees: Central Glass Company, Limited
- Applicants: Keiji Sato; Meguru Oe
- Inventors: Keiji Sato; Meguru Oe
- Web page: https://patentgrep.com/patent/US8771882B2

## CPC

- C01D 15/005: {Lithium hexafluorophosphate}
- H01M 10/0568: characterised by the solutes
- Y02E 60/10: Energy storage using batteries
- C01D: COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides C01B17/22; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia and cyanogen, containing nitrogen and other non-metals C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; phosphides C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

There is provided a method for producing an electrolyte solution for lithium ion batteries, in which lithium hexafluorophosphate is used as an electrolyte, comprising the steps of (a) reacting phosphorus trichloride, chlorine and lithium chloride in a nonaqueous organic solvent; and (b) reacting a reaction product of the step (a) formed in the solvent, with hydrogen fluoride.

## Claims

### Claim 1

A method for producing an electrolyte solution for lithium ion batteries, in which lithium hexafluorophosphate is used as an electrolyte, comprising the steps of:
(a) reacting phosphorus trichloride, chlorine and lithium chloride in a nonaqueous organic solvent, thereby producing lithium hexachlorophosphate in the solvent; and
(b) reacting the lithium hexachlorophosphate in the solvent with hydrogen fluoride, thereby producing a lithium hexafluorophosphate-containing solution.

### Claim 2 (depends on 1)

A method for producing an electrolyte solution for lithium ion batteries according to claim 1, wherein the nonaqueous organic solvent is a chain or cyclic carbonate or an ether compound having at least two oxygen atoms.

### Claim 3 (depends on 2)

A method for producing an electrolyte solution for lithium ion batteries according to claim 2, wherein the carbonate is at least one selected from the group consisting of dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, ethylene carbonate, and propylene carbonate.

### Claim 4 (depends on 2)

A method for producing an electrolyte solution for lithium ion batteries according to claim 2, wherein the ether compound is 1,2-dimethoxyethane.

### Claim 5

A method for producing an electrolyte solution for lithium ion batteries, in which lithium hexafluorophosphate is used as an electrolyte, comprising the steps of:
(a) reacting phosphorus trichloride, chlorine and lithium chloride in a nonaqueous organic solvent, thereby producing lithium hexachlorophosphate in the solvent;
(b) reacting the lithium hexachlorophosphate in the solvent with hydrogen fluoride, thereby producing a lithium hexafluorophosphate-containing solution; and
(c) adding further lithium chloride to the solution produced in step (b) to convert excess hydrogen fluoride to hydrogen chloride and lithium fluoride.

### Claim 6 (depends on 5)

A method for producing an electrolyte solution for lithium ion batteries according to claim 5, wherein the nonaqueous organic solvent is a chain or cyclic carbonate or an ether compound having at least two oxygen atoms.

### Claim 7 (depends on 6)

A method for producing an electrolyte solution for lithium ion batteries according to claim 6, wherein the carbonate is at least one selected from the group consisting of dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, ethylene carbonate, and propylene carbonate.

### Claim 8 (depends on 6)

A method for producing an electrolyte solution for lithium ion batteries according to claim 6, wherein the ether compound is 1,2-dimethoxyethane.