Patent ID: 7990680

Claim:
A method of manufacturing a porous coke suitable as a charge-storing material in electrochemical capacitors, which comprises the steps of: performing one of manufacturing and providing a non-calcined isotropic coke with one of spherical and onion-shaped morphology and low graphitizability as a starting material and with an interlayer distance d 002 determined by an X-ray diffraction method above 0.35 nm and an apparent stacking height L c below 6.5 nm; commingling with caustic alkali to obtain a homogenous mixture; heat-treating the homogenous mixture at a temperature in a range between 650 and 950° C. to obtain the porous coke, a specific surface area of the porous coke being at least 2,000 g/m 2 determined with the BET method, a maximum of a pore size distribution of the porous coke being in a transition region between micropores and mesopores; and washing and neutralization of the porous coke.