| 摘要 |
<p>Provided is a lithium ion capacitor which is increased in the capacity, while suppressing falling-off of an active material from a collector. A lithium ion capacitor which is provided with: a positive electrode which comprises a positive electrode active material and a positive electrode collector that holds the positive electrode active material; a negative electrode which comprises a negative electrode active material and a negative electrode collector that holds the negative electrode active material; and a nonaqueous electrolyte solution having lithium ion conductivity. The positive electrode collector and/or the negative electrode collector is a porous body having communicating pores, and the porosity of the porous body is more than 30% but 98% or less. The communicating pores are filled with the positive electrode active material or the negative electrode active material, and the positive electrode active material or the negative electrode active material is capable of reversibly supporting lithium. The positive electrode active material and/or the negative electrode active material is predoped with lithium, and all or some of the lithium predoped into the negative electrode active material is predoped thereinto directly or through at least one positive electrode layer from lithium that is electrochemically connected to the negative electrode.</p> |
