PURPOSE: To provide a non-aqueous electrolyte secondary battery with excellent low temperature properties and an excellent shelf life at high temperature by improving the solvent of an electrolytic solution.
CONSTITUTION: A non-aqueous electrolyte secondary battery is provided with an anode 3 made of a carbonaceous material which can absorb and desorb lithium ion, a non-aqueous electrolytic solution, and a cathode 1 made of a lithium-containing oxide and the solvent of the non-aqueous electrolytic solution is prepared by mixing ethylene carbonate, ethyl methyl carbonate, and methyl propionate. The mixing ratio of ethylene carbonate is adjusted to not less than 20% and not more than 30% of the total solvent and the mixing ratio of methyl propionate is adjusted not less than 1% and not more than 10% of the total solvent.
YONEHARA TOMOKICHI
MINAFUJI TAKESHI
KOSHINA HIDE
