Engineering crystal water in potassium ammonium vanadate for fast Zn-ion storage

The effect of different annealing temperatures on the electrochemical performance of potassium ammonium vanadate (KNVO) was investigated, and the annealed KNVO regained H 2 O from the aqueous electrolyte to achieve an optimal structural water content during activation. In addition, the accompanying...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2023-01, Vol.59 (3), p.342-345
Main Authors: Xue, Rui, Jiang, Guoquan, Yang, Zhaoming, Yang, Hengming, Chen, Qingchun, Feng, Wen, Qiu, Nan, Wang, Yuan
Format: Article
Language:English
Subjects:
Annealing
Aqueous electrolytes
Diffusion rate
Electrochemical analysis
Ion storage
Moisture content
Potassium
Vanadates
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Summary:The effect of different annealing temperatures on the electrochemical performance of potassium ammonium vanadate (KNVO) was investigated, and the annealed KNVO regained H 2 O from the aqueous electrolyte to achieve an optimal structural water content during activation. In addition, the accompanying oxygen vacancies further promoted Zn 2+ diffusion kinetics of the KNVO cathode in AZIBs and achieved excellent rate performance (344 mA h g −1 at 10 A g −1 ). A facile approach for high power density zinc ion battery cathodes was demonstrated. This crystalline-water controlled cathode shows excellent rate performance (344 mA h g −1 at 10 A g −1 ) and a high power density of 6460 W kg −1 for zinc ion storage.
ISSN:1359-7345
1364-548X
DOI:10.1039/d2cc06344a