Secondary battery having non-aqueous electrolyte

Details Secondary battery having non-aqueous electrolyte Secondary battery having non-aqueous electrolyte

Filed on

1993-10-08

Date issued

1995-08-01

Examiner

Kalafut, Stephen

Patent Class

Chemistry: electrical current producing apparatus, product, and

SubClass

Current producing cell, elements, subcombinations and...

SubSubClass

Include electrolyte chemically specified and method

Other Related Categories

429223, 429224, H01M 1040

Type

Patent

Status

active

Patent number

054379458

Description

ABSTRACT:
A secondary battery which employs a non-aqueous solvent for the electrolyte and which includes a positive electrode formed of a compound oxide of lithium and a negative electrode of a carbonaceous material is disclosed. The non-aqueous electrolyte, comprised of an electrolyte dissolved in the non-aqueous solvent, is employed in such secondary battery. According to the present invention, a mixed solvent composed of propylene carbonate and methyl ethyl carbonate is employed. The volume ratio of propylene carbonate to methyl ethyl carbonate is 6:4 to 3:7 and preferably 4.5:5.5 to 3:7. As the electrolyte, LiPF.sub.6 is dissolved at a concentration of 0.6 to 1.8 mol/lit. The battery is not increased in its internal pressure even when employed under a high temperature environment, while its electrolyte is not solidified when the battery is employed under a low temperature environment, such that a high energy density, a long service life and high operating reliability may be achieved over a broad range of the working temperature.

REFERENCES:
patent: 3544385 (1970-12-01), Newman
patent: 5192629 (1993-03-01), Guyomard et al.
patent: 5264201 (1993-11-01), Dahn et al.
patent: 5292601 (1994-03-01), Sugeno et al.

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