| 摘要 |
A lithium secondary battery comprising a negative electrode using as an active material at least one kind selected from the group of metallic lithium, lithium alloys or materials which are capable of electrochemically occluding and releasing lithium ions, a positive electrode using as an active material at least one kind of compounds which are capable of electrochemically occluding and releasing lithium ions, and an organic electrolyte. It is characterized in that a solvent for the organic electrolyte is composed mainly of a mixture solvent prepared by mixing an organic solvent indicated by structure expression I, i.e. 4-trifluoromethyl-1,3-dioxolane-2-one, with one kind selected from the group of organic solvent indicated by structure expression II, e.i. 1-trifluoroethylmethyl carbonate, and/or an organic solvent indicated by structure expression III, i.e. di-1-trifluoroethyl carbonate, as mentioned below. As a result of using the solvent which contains the above-mentioned mixture solvent as a main component for the electrolyte, a lithium secondary battery with improved high-rate discharge characteristics, cycle characteristics and safety characteristics is obtained. <CHEM> |
