| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rechargeable lithium-ion battery which has efficient charging and discharging properties at low temperatures. <P>SOLUTION: A cathode which uses amorphous carbon as a cathode active material, and an anode which uses lithium manganate as an anode active material are steeped in a non-aqueous electrolyte to fabricate the rechargeable lithium-ion battery. For the non-aqueous electrolyte, 1 mol/liter of lithium phosphate hexafluoride is dissolved into a mixed solvent wherein ethylene carbonate (EC), dimethyl carbonate (DMC), and diethyl carbonate (DEC) are mixed at a prescribed volume ratio. The mixed solvent satisfies y=z, 20<x<30, and x≤2y/3+10, where mixing ratios of EC, DMC, and DEC to the non-aqueous electrolyte are x, y, and z vol.% respectively. Due to this composition, the ion solubility of the non-aqueous electrolyte is increased, and the viscosity is reduced even at low temperatures. <P>COPYRIGHT: (C)2004,JPO |
