| 摘要 |
PURPOSE:To improve characteristics of recovery through charging after excessive discharge in high-temperature atmosphere by limiting the volume of lithium within negative electrode alloy and adding BL as solvent for electrolytic liquid. CONSTITUTION:The composition rate of BL as solvent in electrolytic solution is placed at 3-50vol% of total solvent, while the quantity of lithium in negative electrode alloy is limited to not more than 5wt% of total alloy. Through this arrangement, BL works on and thereby forms a protective film over an active lithium surface shaped on the surface of the activated carbon of a positive electrode 4 due to discharge reaction, thereby curbing reaction between lithium and DME or trace water content in high-temperature atmosphere. Since the volume of lithium in the alloy of a negative electrode 6 is limited, transfer of much lithium to the activated carbon of the positive electrode does not occur, so that it is possible to bring about maximum effect from BL. Therefore, characteristics of recovery through charging can be improved. |
