Journal
NANO LETTERS
Volume 14, Issue 7, Pages 4119-4124Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl501692p
Keywords
Orthorhombic V2O5; sodium-ion batteries; pseudocapacitance; ambient hydrolysis deposition
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Funding
- Oregon State University
- National Science Foundation [DMR 08-05148]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0805148] Funding Source: National Science Foundation
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For the first time, we demonstrate that orthorhombic V2O5 can exhibit superior electrochemical performance in sodium ion batteries when uniformly coated inside nanoporous carbon. The encapsulated V2O5 shows a specific capacity as high as 276 mAh/g, while the whole nanocomposite exhibits a capacity of 170 mAh/g. The V2O5/C composite was fabricated by a novel ambient hydrolysis deposition that features sequential water vapor adsorption in nanoporous carbon, followed by a hydrolysis reaction, exclusively inside the nanopores. The unique structure of the nanocomposite significantly enhances the capacity as well as the rate performance of orthorhombic V2O5 where the composite retains a capacity of over 90 mAh/g at a current rate of 640 mA/g. Furthermore, by calculating, we also revealed that a large portion of the sodium-ion storage, particularly at high current rates, is due to the V2O5 pseudocapacitance.
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