Journal
ACS NANO
Volume 6, Issue 1, Pages 530-538Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn203869a
Keywords
nanostructured electrodes; electrochemical deposition; bilayered V2O5; sodium-ion battery
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Funding
- U.S. Department of Energy
- U.S. DOE-BES [DE-AC02-06CH11357]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- NSERC (Canada)
- National Science Foundation-Earth Sciences [EAR-0622171]
- Department of Energy-Geosciences [DE-FG02-94ER14466]
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Tailoring nanoarchitecture of materials offers unprecedented opportunities In utilization of their functional properties. Nanostructures of vanadium oxide, synthesized by electrochemical deposition, are studied as a cathode material for rechargeable Na-ion batteries. Ex situ and in situ synchrotron characterizations revealed the presence of an electrochemically responsive bilayered structure with adjustable intralayer spacing that accommodates intercalation of Na+ ions. Sodium intake induces organization of overall structure with appearance of both long- and short-range order, while deintercalation is accompanied with the loss of long-range order, whereas short-range order is preserved. Nanostructured electrodes achieve theoretical reversible capacity for Na2V2O5 stochiometry of 250 mAh/g. The stability evaluation during charge discharge cycles at room temperature revealed an efficient 3 V cathode material with superb performance: energy density of similar to 760 Wh/kg and power density of 1200 W/kg. These results demonstrate feasibility of development of the ambient temperature Na-ion rechargeable batteries by employment of electrodes with tailored nanoarchitectures.
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