| 简介 |
PROBLEM TO BE SOLVED : To obtain a carbonaceous substance stable in air and exhibiting a low natural electric potential in an electrolyte solution, and to obtain an electric double layer capacitor using the carbonaceous substance as the electrode material of the capacitor and having improved electric voltage resistance, cycle durability, durability on the application of electric voltages, and energy density. SOLUTION : This carbonaceous substance contains elements comprising alkali metals, alkaline earth metals and rare earth metals in a total amount of 100-2, 000 ppm, and has a natural electric potential of 1.50-2.85 V, when Li/Li is used as a counter electrode in a nonaqueous electrolyte solution. The electric double layer capacitor using the nonaqueous electrolyte solution uses the carbonaceous substance as the main material of the electrodes. |
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