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Pseudocapacitive Sodium Storage in Mesoporous Single-Crystal-like TiO2–Graphene Nanocomposite Enables High-Performance Sodium-Ion Capacitors
Abstract
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 TiO 2 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 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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Metadata
- Authors
- Le, Z., Liu, F., Nie, P., Li, X., Liu, X., Bian, Z., Chen, G., Wu, H. B., & Lu, Y.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2017-03-15
- Volume
- 11
- Issue
- 3
- Pages
- 2952-2960
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2594463021
- Cited by
- 614
- References
- 40
- FWCI
- 31.11
- Type
- journal article
- Language
- en
- Open access
- closed
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