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Phys Chem Chem Phys. 2012 Mar 14;14(10):3388-91. doi: 10.1039/c2cp00017b. Epub 2012 Feb 1.

Activated graphene as a cathode material for Li-ion hybrid supercapacitors.

Author information

1
Department of Mechanical Engineering and the Materials Science and Engineering Program, The University of Texas at Austin, 1 University Station, C2200, Austin, TX 78712-0292, USA.

Abstract

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 Li(4)Ti(5)O(12) (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).

PMID:
22298158
DOI:
10.1039/c2cp00017b

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