Secondary battery

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.

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.