Orientation Effect of Zinc Vanadate Cathode on Zinc Ion Storage Performance

Huili Cao*, Chao Peng, Zhiyong Zheng, Zhenyun Lan, Qinying Pan, Ulla Gro Nielsen, Poul Norby, Xinxin Xiao*, Susanne Mossin*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Rechargeable aqueous zinc-ion battery (ZIB) is considered as a promising energy storage device due to the low cost, high obtainable output voltage, non-toxicity, and environmental friendliness. To achieve an excellent energy storage performance, morphology engineering of cathode materials for aqueous ZIBs is regarded as an important strategy. The impact of dimension and orientation of the cathode material on the electrochemical performance are, however, less studied. Herein, we compare two types of zinc pyrovanadate (Zn3V2O7(OH)2•2H2O, ZnVO) in nanowires and nanoflakes with the same crystal type but different orientations. ZnVO nanowires expose mostly the (001) plane lattice, in contrast to (020) and (110) lattice for ZnVO flakes. Interestingly, nanowires exhibit an excellent specific discharge capacity of 108 mAh g−1 after 700 cycles at 2 A g−1, contributed from Faradic and diffusion-controlled capacity. In contrast, nanoflakes deliver a very poor capacity of 1.5 mAh g−1 after 700 cycles at 0.1 A g−1 with only diffusion-controlled capacity. Density functional theory (DFT) reveals significantly different Zn2+ ion diffusion rates in ZnVO along different orientations.
Original languageEnglish
Article number138646
JournalElectrochimica Acta
ISSN0013-4686
DOIs
Publication statusAccepted/In press - 2021

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