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R7.04 - Development of Graphene-Based Flexible Materials for Energy Storage Devices 
Date/Time:
April 24, 2014   9:00am - 9:30am
 
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Graphene materials have high specific surface area, good chemical stability, high electrical and thermal conductivity, and excellent flexibility. Therefore, graphene-based materials can be used as free-standing and binder-free electrodes for flexible energy storage devices.A high efficient chemical exfoliation approach was developed to synthesize large-quantity multilayer graphene materials. By using these graphene materials, a flexible graphene/polyaniline paper was prepared by in situ anodic electropolymerization of polyaniline on a graphene membrane, and it shows a stable large electrochemical capacitance and excellent cyclibility; graphene-cellulose paper membranes were fabricated as freestanding and binder-free electrodes for flexible supercapacitors with good performance; a graphene membrane was used as the current collector for Li-S batteries to trap polysulfides, which shows significant improvement in cyclability and capacity. We also developed template-directed CVD to synthesize a three-dimensional interconnected graphene framework (GF). By coating active materials on the GF, an anode and cathode were made to assemble a thin, lightweight and flexible lithium ion battery. The battery has high rate capability and capacity, and can be repeatedly bent down to <5 mm without failure and degradation of its electrochemical performance.
 


 
 
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