Lithium-ion Capacitor

摘要

The invention provides a negative electrode material for use with a lithium-ion capacitor (10), which is high in energy density, output density and excellent in durability. When graphite of which an average distance between 002 lattice planes thereof is within a range from 0.335 nm to 0.337 nm is used for an active material of a negative electrode (12) of a lithium-ion capacitor (10), the energy density of the capacitor is increased. The output characteristic and the cycle durability can be improved when D 10 , D 50 and D 90 are set within predetermined ranges.