# US 5,352,548 A · Secondary battery

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- Number: US 5,352,548 A
- Document ID: US5352548A
- Status: Granted
- Kind: A
- Application number: 08/085,631
- Filed: 1993-06-30
- Granted: 1994-10-04
- Earliest claimed: 1992-07-27
- Assignees: Sanyo Electric Co., Ltd.
- Inventors: Masahisa Fujimoto; Masatoshi Takahashi; Koji Nishio
- Web page: https://patentgrep.com/patent/US5352548A

## CPC

- H01M 10/0569: characterised by the solvents
- Y02E 60/10: Energy storage using batteries
- 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

A secondary battery is comprised of a positive electrode, a negative electrode formed from a carbon composition intercalating lithium reversibly and a non-aqueous electrolyte. The non-aqueous electrolyte includes a lithium salt and a mixture of a low boiling point solvent having the boiling point of 150.degree. C. or lower and an organic solvent of vinylene carbonate or its derivative. The negative electrode may comprise a graphite, and the positive electrode may comprise a material being selected from a group consisting of metal chalcogen and metal oxide, such as V.sub.2 O.sub.5, TiS.sub.2, MoS.sub.2, LiCoO.sub.2, LiMnO.sub.2, LiNiO.sub.2, LiCrO.sub.2, LiMn.sub.2 O.sub.4 and LiFeO.sub.2. The low boiling point solvent may be selected from a group consisting of dimethyl carbonate, diethyl carbonate, 1,2-dimethoxy ethane, 1,2-diethoxy ethane and ethoxymethoxy ethane. The derivative may be provided by replacing at least one of two hydrogen atoms of the vinylene carbonate with one selected from a group consisting of a methyl group, an ethyl group and one halogen atom.

## Claims

### Claim 1

A secondary battery, comprising:
a positive electrode;
a negative electrode having a carbon composition intercalating lithium reversibly, said negative electrode comprising a graphite; and
a non-aqueous electrolyte including a lithium salt and a mixture of at least a low boiling point solvent having a boiling point of 150.degree. C. or lower and an organic solvent defined by one of vinylene carbonate and a derivative provided by replacing at least one of two hydrogen atoms of said vinylene carbonate with one selected from a group consisting of a methyl group, an ethyl group and one halogen atom, wherein said low boiling point solvent is selected from a group consisting of dimethyl carbonate, diethyl carbonate, 1,2-dimethoxy ethane, 1,2-diethoxyethane and ethoxymethoxy ethane.

### Claim 2 (depends on 1)

A secondary battery according to claim 1, wherein said positive electrode comprises a material being selected from a group consisting of metal chalcogen and metal oxide.

### Claim 3 (depends on 2)

A secondary battery according to claim 2, wherein said material is selected from a group consisting of TiO.sub.2, V.sub.2 O.sub.5, TiS.sub.2, MoS.sub.2, LiCoO.sub.2, LiMnO.sub.2, LiNiO.sub.2, LiCrO.sub.2, LiMn.sub.2 O.sub.4 and LiFeO.sub.2.

### Claim 4

A secondary battery, comprising:
a positive electrode having one of metal chalcogen and metal oxide selected from a group consisting of TiO.sub.2, V.sub.2 O.sub.5, TiS.sub.2, MoS.sub.2, LiCoO.sub.2, LiMnO.sub.2, LiNiO.sub.2, LiCrO.sub.2, LiMn.sub.2 O.sub.4 and LiFeO.sub.2 ;
a negative electrode comprising a graphite intercalating lithium reversibly; and
a non-aqueous electrolyte including a lithium salt and a mixture of at least a low boiling point solvent having a boiling point of 150.degree. C. or lower and an organic solvent defined by one of vinylene carbonate and a derivative provided by replacing at least one of two hydrogen atoms of said vinylene carbonate with one selected from a group consisting of a methyl group, an ethyl group and one halogen atom of said vinylene carbonate, wherein said mixture includes 20 volume %-80 volume % of said vinylene carbonate or said derivative, and said low boiling point solvent is selected from a group consisting of dimethyl carbonate, diethyl carbonate, 1,2-dimethoxy ethane, 1,2-diethoxy ethane and ethoxymethoxy ethane.

### Claim 5

A secondary battery, comprising:
a positive electrode having one of metal chalcogen and metal oxide;
a negative electrode essentially consisting of a graphite intercalating lithium reversibly; and
a non-aqueous electrolyte including a lithium salt and a mixture of at least two organic solvents, wherein said mixture is composed of a low boiling point solvent having a boiling point of 150.degree. C. or lower and an organic solvent defined by one of vinylene carbonate and a derivative provided by replacing at least one of two hydrogen atoms of said vinylene carbonate with one selected from a group consisting of a methyl group, an ethyl group and one halogen atom, wherein said mixture includes 20 volume %-80 volume % of said vinylene carbonate or said derivative.

### Claim 6 (depends on 5)

A secondary battery, according to claim 5, wherein said positive electrode includes a material selected from a group consisting of TiO.sub.2, V.sub.2 O.sub.5, TiS.sub.2, MoS.sub.2, LiCoO.sub.2, LiMnO.sub.2, LiNiO.sub.2, LiCrO.sub.2, LiMn.sub.2 O.sub.4 and LiFeO.sub.2.

### Claim 7 (depends on 5)

A non-aqueous electrolyte according to claim 5, wherein said low boiling point solvent is a solvent selected from a group consisting of dimethyl carbonate, diethyl carbonate, 1,2-dimethoxy ethane, 1,2-diethoxy ethane and ethoxymethoxy ethane.