| 摘要 |
PURPOSE:To improve low temperature characteristics and restrict increase of an inner resistance after discharge by adding compound including phosphorus element to organic electrolyte consisting of organicsolvent including cyclic ether and lithium salt dissolved in it. CONSTITUTION:Ester is included in organic solvent by more than 1% by the volume ratio. Lithium salt shall be at least one of LiCO4 and LiCF3SO3. Compound including phosphorus element shall be that having a bond of P-F, and it shall be at least one of PF5, solvent of PF5 and double salt of PF5 with other salt. The double salt of PF5 with other salt shall be that including PF5<->. The compound including phosphorus element shall be added by more than 10<-3>mol/l to the whole electrolyte, and its addition quantity shall be less than 30% of dissolved lithium salt quantity, while it shall be more than 2X10<-3> by the mol ratio to cyclic ether. |
