| 摘要 |
PURPOSE:To extend a cycle life by using tungsten dioxide as a negative electrode active material holder, and using a mixed solvent as an electrolytic solvent, so as to provide high voltage, high energy density, large charge/discharge capacity and further high safety. CONSTITUTION:Tungsten dioxide (WO2) is used as a negative electrode active material holder, and further a mixed solvent, having ethylene carbonate (EC) as an inevitable component, is used as a nonaqueous electrolyte. Thus in electrode potential 0.0 to 1.0V relating to a lithium reference electrode conventionally called non-reversible in WO2, a large charge/discharge capacity and stable long cycle life are obtained. Consequently, even when the WO2 is used as the negative electrode active material holder, remarkably decreasing operating voltage of a battery is eliminated, and high voltage and high energy density can be attained. Further because of large specific gravity, in also a charge/ discharge capacity per negative electrode volume, a very large capacity can be obtained as compared with a graphite system negative electrode, and also a cycle life can be extended. |
