Activated graphene as a cathode material for Li-ion hybrid supercapacitors
文献情報
Meryl D. Stoller, Shanthi Murali, Neil Quarles, Yanwu Zhu, Jeffrey R. Potts, Xianjun Zhu, Hyung-Wook Ha, Rodney S. Ruoff
Chemically activated graphene (‘activated microwave expanded graphite oxide’, a-MEGO) was used as a cathode material for Li-ion hybrid supercapacitors. The performance of a-MEGO was first verified with Li-ion electrolyte in a symmetrical supercapacitor cell. Hybrid supercapacitors were then constructed with a-MEGO as the cathode and with either graphite or Li4Ti5O12 (LTO) for the anode materials. The results show that the activated graphene material works well in a symmetrical cell with the Li-ion electrolyte with specific capacitances as high as 182 F g−1. In a full a-MEGO/graphite hybrid cell, specific capacitances as high as 266 F g−1 for the active materials at operating potentials of 4 V yielded gravimetric energy densities for a packaged cell of 53.2 W h kg−1.
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