Journal
ACS NANO
Volume 11, Issue 3, Pages 2952-2960Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b08332
Keywords
sodium-ion capacitor; TiO2; nanocomposite; pseudocapacitive; energy storage
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Funding
- UCLA Dynavolt Research Center [442531-LY-57914]
- Center of HK Graphene Technology and Energy Storage [442531-LY-57759]
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Sodium-ion capacitors can potentially combine the virtues of high power capability of conventional electrochemical capacitors and high energy density of batteries. However, the lack of high-performance electrode materials has been the major challenge of sodium-based energy storage devices. In this work, we report a microwave-assisted synthesis of single-crystal-like anatase TiO2 mesocages anchored on graphene as a sodium storage material. The architecture of the nanocomposite results in pseudocapacitive charge storage behavior with fast kinetics, high reversibility, and negligible degradation to the micro/nanostructure. The nanocomposite delivers a high capacity of 268 mAh g(-1) at 0.2 degrees C, which remains 126 mAh g(-1) at 10 C for over 18 000 cycles. Coupling with a carbon-based cathode, a full cell of sodium-ion capacitor successfully demonstrates a high energy density of 64.2 Wh kg(-1) at 56.3 W kg(-1) and 25.8 Wh kg(-1) at 1357 W kg(-1), as well as an ultralong lifespan of 10 000 cycles with over 90% of capacity retention.
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