| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved lithium ion capacitor capable of achieving high energy density and high output density. SOLUTION: The lithium ion capacitor has a positive electrode, a negative electrode, and an aprotic organic solvent electrolytic solution of lithium salt as an electrolyte. A positive electrode active substance can reversibly carry lithium ions and/or anions; a negative electrode active substance can reversibly carry lithium ions; the lithium ion is doped to the negative electrode and/or the positive electrode, so that the potential of the positive electrode becomes 2.0V or smaller after short-circuiting the positive and negative electrodes; and the positive electrode active substance is an active carbon particle having a lactone-like carboxyl functional group of 0.07 mmol/g or higher. COPYRIGHT: (C)2007,JPO&INPIT
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