NEGATIVE-ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION CAPACITOR

摘要

This invention provides a negative electrode active material for lithium ion capacitor, which reduces the thickness of a negative-electrode active material layer while maintaining the conventional level of energy density.;The negative-electrode active material for a lithium ion capacitor is a composite carbon material manufactured by kneading a carbon black having an average particle diameter of 12 to 300 nm measured by the electron microscopy method with a carbon precursor such as pitch, the resulting mixture is baked or graphitized baking between 800° C. to 3200° C., and then pulverized such that the average particle diameter (D50) thereof is 1 to 20 μm and the BET specific surface area is between 100-350 m2/g. An initial charging capacity is at least 700 mAh/g, and the cell volume is reduced as the thickness of the negative electrode active material layer becomes thinner than the conventional one.

主权项

1. A negative electrode active material for lithium ion capacitor of a composite porous carboneous material manufactured by kneading a carbon black having an average diameter of 12-300 nm measured by the electron microscope method with a carbon precursor and baking or graphitizing the kneaded mixture at a temperature of 800° C.-3200° C., followed by pulverizing to an average diameter (D50) of 1-20 μm, wherein BET specific surface area is above 100 m2/g and less than 350 m2/g.