Journal
NANO ENERGY
Volume 74, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104851
Keywords
High-nuclearity polyoxometalate; Mixed-valence polyoxovanadate; Zn2+ migration channel; Energy storage mechanism; Aqueous zinc ion battery
Categories
Funding
- National Natural Science Foundation of China [21871077, 21571048, 21671054, 21771052, 21902044]
- Program for Innovation Teams in Science and Technology in Universities of Henan Province [20IRTSTHN004]
- China Postdoctoral Science Foundation [2019M652517]
- Major Project of Science and Technology, Education Department of Henan Province [202102310224]
- Program of First-Class Discipline Cultivation Project of Henan University [2019YLZDYJ02]
- 2019 Students Innovative Pilot Plan of Henan University [201910475033, 201910475034]
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To date, the research on Zn2+ storage properties of nanosized high-nuclearity polyoxometalate clusters (HNPCs) in aqueous zinc-ion batteries is still unexplored. Herein, we for the first time utilized the nanosized mixedvalence K-10[(V16V18O82)-V-IV-O-V] (KVO) cluster as a Zn2+ storage material to exploit novel Zn/HNPC battery with eminent charge-discharge properties because the 3-D orderly packing of nanosized KVO clusters in the microstructure can engineer and construct multidimensional interconnected Zn2+ migration channels, which can endow the KVO host with high electron and Zn2+ conductivities and high-efficiency Zn2+ migration behavior. As expected, the as-fabricated Zn/K-10[(V16V18O82)-V-IV-O-V] battery exhibits a high reversible capacity of 401 mAh g(-1) good cyclic stability with capacity retention of 93% over 4000 cycles at 3 A g(-1), and favorable energy (285 Wh kg(-1)) and power density (4.5 kW kg(-1)). A quantitative Zn2+ storage mechanism has been proposed based on indepth insight on Zn2+ intercalation/deintercalation behavior and redox reaction process during cycling. This work not only provides a new zinc-ion battery research platform of HNPCs and opens up a new understanding of the Zn2+ storage mechanism in the POM host, but also demonstrates a tremendous and promising application potential of HNPCs in aqueous batteries.
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