RAPID MACRO-SCALE SYNTHESIS OF FREE-STANDING GRAPHENE, HIGH PERFORMANCE, BINDER-FREE GRAPHENE ANODE MATERIAL, AND METHODS OF SYNTHESIZING THE ANODE MATERIAL
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United States of America Patent
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Feb 20, 2014
app pub date -
Aug 14, 2013
filing date -
Aug 15, 2012
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Abstract
A method of synthesizing a sheet of graphene oxide paper includes combining graphite oxide with water to form a colloidal suspension of graphene oxide; providing a working electrode and a counter electrode such that the working electrode and the counter electrode are inserted in the colloidal suspension; applying a potentiostatic field until a film of graphene oxide having a predetermined thickness forms on the working electrode; and drying the film to form a graphene oxide paper. The method may also include reducing the graphene oxide to graphene by either photo-thermal reduction or thermal exfoliation. The reduced graphene material exhibits high energy density as well as high power density making it useful as anode material for rechargeable batteries.
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