期刊
ACS NANO
卷 13, 期 9, 页码 10776-10786出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b05605
关键词
battery-supercapacitor hybrids; rGO@VO2 sheet-on-sheet heterostructure; working potential; energy density; fast charging; self-discharge
类别
资金
- Institute for Basic Science of Korea [IBS-R011-D1]
- Department of Science and Technology [DST/INSPIRE/04/2018/001825]
The battery-supercapacitor hybrid (BSH) device has potential applications in energy storage and can be a remedy for low-power batteries and low-energy supercapacitors. Although several studies have investigated electrode materials (particularly for a battery-type anode material) and design for BSHs, the energy density and power density are insufficient (far from the levels required for practical applications). Herein, a hierarchical vanadium(IV) oxide on reduced graphene oxide (rGO@VO2) heterostructure as an anode and activated carbon on carbon cloth (AC@CC) as a cathode are proposed for fabricating an advanced BSH. The mixed valency of V ions inside the as-prepared VO2 matrix (V3+ and V4+) facilitates redox reactions at a low potential, giving rise to rGO@VO2 as a typical anode with a working potential of 0.01-3 V (vs Li/Li+). The sheet-on-sheet heterostructured rGO@VO2 yields a high specific capacity of 1214 mAh g(-1) at 0.1 A g(-1) after 120 cycles, with a high rate capability and stability. The rGO@VO2//AC@CC BSH device exhibits a maximum gravimetric energy density of 126.7 Wh kg(-1) and a maximum gravimetric power density of similar to 10 000 W kg(-1) within a working voltage range of 1-4 V. Moreover, it exhibits fast charging times of 5 and 834 s with energy densities of 15.6 and 82 Wh kg(-1), respectively.
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