Journal
ACS NANO
Volume 6, Issue 5, Pages 4319-4327Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn300920e
Keywords
nanocomposites; pseudocapacitors; V2O5 nanowires; sodium-ion electrodes; high-rate
Categories
Funding
- Molecularly Engineered Energy Materials, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC001342]
- Office of Naval Research
- General Motor Inc.
- IMRA America Inc.
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Electrical energy storage plays an increasingly important role in modern society. Current energy storage methods are highly dependent on lithium-ion energy storage devices, and the expanded use of these technologies is likely to affect existing lithium reserves. The abundance of sodium makes Na-ion-based devices very attractive as an alternative, sustainable energy storage system. However, electrodes based on transition-metal oxides often show slow kinetics and poor cycling stability, limiting their use as Na-ion-based energy storage devices. The present paper details a new direction for electrode architectures for Na-ion storage. Using a simple hydrothermal process, we synthesized interpenetrating porous networks consisting of layer-structured V2O5 nanowires and carbon nanotubes (CNTs). This type of architecture provides facile sodium insertion/extraction and fast electron transfer, enabling the fabrication of high-performance Na-ion pseudocapadtors with an organic electrolyte. Hybrid asymmetric capacitors incorporating the V2O5/CNT nanowire composites as the anode operated at a maximum voltage of 2.8 V and delivered a maximum energy of similar to 40 Wh kg(-1), which is comparable to U-Ion-based asymmetric capacitors. The availability of capacitive storage based on Na-ion systems Is an attractive, cost-effective alternative to Li-ion systems.
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