Large-scale energy storage applications, such as renewable energy storage and smart-grid, drive the development of more sustainable and affordable organic electrodes. Recently, it has been shown that oxygen functional groups on the surface of nano-carbon materials can react with Li-ions reversibly at ~3 V vs Li, proposing these organic materials new rising positive electrodes for the Li-ion batteries. As the redox reactions primarily take place on the surface of the nano-carbons, with no intercalation reactions involved, these electrodes generally show both high power and high energy density, and good cycling stability. In this work, we demonstrate self-assembled 3D graphene electrodes by a controllable hydrothermal reduction process of graphene oxide. The synthesized 3D graphene electrodes showed high gravimetric capacity of ~140 mAh/g in two electrode lithium-cell by utilizing the surface redox reaction between oxygen functional groups and lithium ions.We further demonstrate these self-assembled graphene electrodes are promising substrates for nano-scale coatings of various oxides, molecules, and polymers to design high-performance energy storage devices.

Self-assembled 3D graphene oxide electrodes for lithium-ion batteries

248th National Meeting (2014)

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