LITHIUM ION CAPACITOR

摘要

Disclosed is a lithium ion capacitor comprising a positive electrode which is composed of a material capable of being reversibly doped/dedoped with lithium ions and/or anions, a negative electrode which is composed of a material capable of being reversibly doped/dedoped with lithium ions, and an electrolyte solution which is composed of an aprotic organic solvent electrolyte solution of a lithium salt. The negative electrode and/or the positive electrode is doped with lithium ions by an electrochemical contact between the negative electrode and/or the positive electrode and a lithium ion supply source. The potential of the positive electrode after short-circuiting the positive electrode with the negative electrode is not more than 2.0 V (against Li/Li⁺). The positive electrode and/or the negative electrode has a collector which is composed of a metal foil having many through holes penetrating therethrough from the front surface to the rear surface. The circles inscribed within the through holes have an average diameter of not more than 100 µm.