Novel structurally-stable Na-rich Na4V2O7 cathode material with high reversible capacity by utilization of anion redox activity

A sodium-rich vanadium compound, Na4V2O7, is investigated as a cathode material for sodium-ion batteries, which delivers a high reversible capacity of 194 mA h g−1 after activating to 4.7 V. By limiting the cut-off voltage to 4.4 V, a good capacity retention of 93% after 50 cycles is achieved. The m...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2020-07, Vol.56 (59), p.8245-8248
Main Authors: Su, Bizhe, Liang, Hanqin, Liu, Junnan, Wu, Jimmy, Sharma, Neeraj, Gu, Qinfen, Johannessen, Bernt, Yu, Denis Y W
Format: Article
Language:English
Subjects:
Cathodes
Electrode materials
Rechargeable batteries
Sodium-ion batteries
Vanadium compounds
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Summary:A sodium-rich vanadium compound, Na4V2O7, is investigated as a cathode material for sodium-ion batteries, which delivers a high reversible capacity of 194 mA h g−1 after activating to 4.7 V. By limiting the cut-off voltage to 4.4 V, a good capacity retention of 93% after 50 cycles is achieved. The material exhibits a negligible volume variation of 1.04% during Na+ (de-)intercalation, demonstrating that Na4V2O7 is structurally-stable.
ISSN:1359-7345
1364-548X
DOI:10.1039/d0cc02816a