Korea Electrotechnology Research Institute

Ick Jun Kim

Sun Hye Yang

Jong Hwan Park

Geon Woong Lee

Hee Jin Jeong

Joong Tark Han

Seung Yol Jeong

Seon Hee Seo

Soo Yeon Jeong

Hyun Soo Kim

Hye Jung Lee

Seong In Moon

Min Jae Jeon

The present invention relates to a reduced-graphene-oxide/silicon-metal-particle composite, a method of manufacturing the composite and an electrode for a secondary battery including the composite. The method of manufacturing the reduced-graphene-oxide/silicon-metal-particle composite includes preparing a reduced-graphene-oxide dispersion solution by reducing graphene oxide formed through cation-pi interaction, preparing a reduced-graphene-oxide/silicon-metal-particle dispersion solution by mixing the reduced-graphene-oxide dispersion solution with silicon metal particles, and manufacturing a composite powder having a core-shell structure by drying the reduced-graphene-oxide/silicon-metal-particle dispersion solution. Thereby, reduced graphene oxide can be formed using the graphene oxide dispersion solution having few defects and high purity obtained through cation-pi interaction, and dried to afford a composite powder having a core-shell structure, which is applicable to an electrode for a secondary battery.

Reduced graphene oxide-silicon metal particle complex, complex manufacturing method, and secondary battery electrode comprising complex

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.

Electrode active material having high capacitance, method for producing the same, and electrode and energy storage device comprising the same

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Busan, South Korea

Ick Jun Kim