Issue 30, 2023

δ-VOPO4 as a high-voltage cathode material for aqueous zinc-ion batteries

Abstract

Aqueous zinc-ion batteries (AZIBs) with excellent safety, low-cost and environmental friendliness have great application potential in large-scale energy storage systems and thus have received extensive research interest. Layered oxovanadium phosphate dihydrate (VOPO4·2H2O) is an appealing cathode for AZIBs due to the unique layered framework and desirable discharge plateau, but bottlenecked by low operation voltage and unstable cycling. Herein, we propose delta-oxovanadium phosphate (δ-VOPO4) without conventional pre-embedding of metal elements or organics into the structure and paired it into AZIBs for the first time. Consequently, superior to the layered counterpart, δ-VOPO4 exhibits better performance with a prominent discharge voltage of 1.46 V and a higher specific capacity of 122.6 mA h g−1 at 1C (1C = 330 mA g−1), as well as an impressive capacity retention of 90.88 mA h g−1 after 1000 cycles under 10C. By investigation of structure resolution and theoretical calculation, this work well elucidates the structure–function relationship in vanadyl phosphates, offering more chances for exploration of new cathode materials to construct high performance AZIBs.

Graphical abstract: δ-VOPO4 as a high-voltage cathode material for aqueous zinc-ion batteries

Supplementary files

Article information

Article type
Edge Article
Submitted
10 may 2023
Accepted
07 iyl 2023
First published
07 iyl 2023
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2023,14, 8206-8213

δ-VOPO4 as a high-voltage cathode material for aqueous zinc-ion batteries

D. Zhao, X. Pu, S. Tang, M. Ding, Y. Zeng, Y. Cao and Z. Chen, Chem. Sci., 2023, 14, 8206 DOI: 10.1039/D3SC02382F

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