| 摘要 |
PROBLEM TO BE SOLVED: To provide a power source capable of quickly charging and discharging and having high breakdown voltage, high capacity, high energy density and high charge and discharge cycle reliability by having a positive electrode including the activated carbon and the lithium contained transition metal oxide, a negative electrode including a carbon material for storing and releasing the lithium ion, and the organic electrolyte containing the lithium salt and a specified compound. SOLUTION: A compound expressed with the formula is used in this secondary power source. (In the formula, R1, R2 are each hydrogen atom or straight chain or branch alkyl group having 1-10 carbons). Desirably, concentration of the compound expressed with the formula is set at 0.1-15 wt.%, and the solvent of the organic electrolyte contains propylene carbonate at 70 wt.% or more, and as the carbon material, a graphite carbon material having 0.335-0.338 nm of spacing of a [002] plane is used, and as the lithium transition metal oxide, a composite oxide of one kind or more to be selected from among a group of V, Mn, Fe, Co, Ni, Zn, W and lithium is used. |
