LITHIUM ION CAPACITOR

摘要

Provided is a lithium-ion capacitor having increased capacity, while also having suppression of the falling away of an active material from a current collector. The lithium-ion capacitor includes: a positive electrode and a negative electrode, both including the active material and the current collector holding the active material; and a non-aqueous electrolyte having lithium ion conductivity. At least one of the current collectors is a porous body having interconnected pores and a porosity of over 30% and 98% or less, the pores filled with either one of the active materials that can reversibly carry lithium. At least one of the active materials is pre-doped with lithium. The lithium pre-doped into the negative electrode active material is, in part or in whole, pre-doped from lithium electrochemically connected to the negative electrode, directly or after passing through at least one or more of the positive electrodes.

主权项

1. A lithium-ion capacitor comprising:
a positive electrode having a positive electrode active material and a positive electrode current collector holding the positive electrode active material; a negative electrode having a negative electrode active material and a negative electrode current collector holding the negative electrode active material; and a non-aqueous electrolyte having lithium ion conductivity, at least one selected from the positive electrode current collector and the negative electrode current collector being a porous body having interconnected pores, a porosity of the porous body being over 30% and 98% or less, the interconnected pores being filled with the positive electrode active material or the negative electrode active material, the positive electrode active material or the negative electrode active material being configured to reversibly carry lithium, at least one selected from the positive electrode active material and the negative electrode active material being pre-doped with lithium, and the lithium pre-doped into the negative electrode active material being, in whole or in part, pre-doped from lithium electrochemically connected to the negative electrode, directly or after passing through at least one or more of the positive electrodes.