| abstract |
(57) [Summary] [Constitution] In a non-aqueous solvent secondary battery comprising a positive electrode; a negative electrode made of a carbonaceous material capable of inserting and extracting lithium ions; and a non-aqueous electrolyte secondary battery, wherein the non-aqueous electrolyte is ethyl carbonate. A non-aqueous solvent secondary battery comprising a mixed solvent of methyl, diethyl carbonate, dimethyl carbonate and ethylene carbonate. [Effect] There is almost no decrease in the discharge capacity at low temperature and the discharge capacity after continuous charging at high temperature. |