Korea Electrotechnology Research Institute

Seong In Moon

Ick Jun Kim

Sun Hye Yang

Min Jae Jeon

Hyun Soo Kim

An active material of the present invention has fine pores formed in the interlayer of a carbon material capable of exhibiting electrochemical double layer capacitance. The fine pores are formed by forming an oxidized graphite structure combined with oxygen in the interlayer of a part or whole of the carbon material containing soft carbon and then removing a part or whole of oxygen in the interlayer. A method for producing an energy storage active material for use in an electrochemical double layer capacitor comprises pre-treating a carbon material through heat treatment and oxidizing the pre-treated carbon material using an oxidant. The method further comprises reducing the oxidized carbon material through heat treatment. The interlayer distances of an active material for respective steps, measured by a powder X-ray diffraction method, are 0.33&#x2dc;0.36 nm in the pre-treatment step, 0.5&#x2dc;2.1 nm in the oxidation step, and 0.34&#x2dc;0.5 nm in the reduction step.

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Gyeongsangnam-do, South Korea

Seong In Moon