Breakthroughs in designing commercial-level mass-loading graphene electrodes for electrochemical double-layer capacitors

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Department of Materials Science and Engineering


Electrochemical double-layer capacitors (EDLCs), a type of energy-storage device with second-level energy storage and delivery rate, are widely applied in the field of consumer electronics, electric vehicles, industrial power quality, and new-grid field. EDLCs are experiencing a 20% annual growth, which will reach a market of $2.18 billion in 2020. Currently the EDLC research and industrial efforts focus on development of highly efficient graphene electrodes. To reduce the gap between the research results and the commercial requirements, excellent performance of graphene-based EDLCs must be obtained with a commercial-level mass loading (10 mg/cm2) of graphene. Over the past 5 years, breakthroughs have been reported for graphene-based EDLCs, achieving ultrahigh areal capacitances (>2 F/cm2) at a large graphene mass loading (>10 mg/cm2) without sacrificing gravimetric and volumetric capacitances. These findings are heralding a bright future for EDLCs.

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