Expansion graphite anode material for lithium capacitors impregnated with lithium expansion graphite

摘要

The present invention relates to a cathode material for a lithium-ion capacitor using expanded graphite impregnated with lithium in a vacuum and a water-based polyacrylate binder and, more specifically, to a cathode material doped with a lithium source by impregnating a lithium compound between layers of expanded graphite while expanding and using the graphite, and a manufacturing process comprising the steps of: expanding the graphite; atomizing the expanded graphite; impregnating the atomized expanded graphite with lithium hydroxide and lithium cobalt oxide (Li_6CoO_4), as a lithium source, in a vacuum; dissolving the vacuum-impregnated expanded graphite and polyacrylate as the water-based binder in distilled water as a solvent; and producing slurry using the liquefied binder to form a sheet, and manufacturing a cathode for a lithium-ion capacitor. Therefore, in the lithium-ion capacitor according to the present invention, a low cost raw material is used for the cathode material to simultaneously satisfy high power and long life characteristics of a supercapacitor and high energy density characteristics of a lithium ion battery, a simplified and uniform doping of a lithium source is used, and an environmentally friendly water-based binder is used.