| 摘要 |
PURPOSE: To improve load performance by using two kinds of specific non-cyclic carbonates as a solvent and specifying the volume percent of them. CONSTITUTION: A positive electrode 1 and a negative electrode 2 are spirally wound through a separator 3 in which a nonaqueous electrolyte is impregnated, and they are housed in a negative can 7. The positive electrode 1 is connected to a positive outer terminal 6 through a positive lead 4, and the negative electrode 2 is connected to the negative can 2 through a negative lead 5, and electric energy is taken out from the terminal 6 and the can 7 to the outside. The negative electrode 2 is made of a carbon material having a spacing of (002) planes (d) of 3.35-3.37Åand a crystallite size in the direction of (c) axis of 400Åor more. Solvents of a nonaqueous electrolyte are formed by 10-50vol.% non-cyclic carbonate containing a specified phenyl group and 90-50vol.% specified non-cyclic carbonate. High load performance can be obtained. |
