Defect engineering on V2O3 cathode for long-cycling aqueous zinc metal batteries

Kefu Zhu, Shiqiang Wei, Hongwei Shou, Feiran Shen, Shuangming Chen (), Pengjun Zhang, Changda Wang, Yuyang Cao, Xin Guo, Mi Luo, Hongjun Zhang, Bangjiao Ye, Xiaojun Wu, Lunhua He () and Li Song ()
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Kefu Zhu: University of Science and Technology of China
Shiqiang Wei: University of Science and Technology of China
Hongwei Shou: University of Science and Technology of China
Feiran Shen: Spallation Neutron Source Science Center
Shuangming Chen: University of Science and Technology of China
Pengjun Zhang: University of Science and Technology of China
Changda Wang: University of Science and Technology of China
Yuyang Cao: University of Science and Technology of China
Xin Guo: University of Science and Technology of China
Mi Luo: University of Science and Technology of China
Hongjun Zhang: University of Science and Technology of China
Bangjiao Ye: University of Science and Technology of China
Xiaojun Wu: University of Science and Technology of China
Lunhua He: Spallation Neutron Source Science Center
Li Song: University of Science and Technology of China

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Defect engineering is a strategy that is attracting widespread attention for the possibility of modifying battery active materials in order to improve the cycling stability of the electrodes. However, accurate investigation and quantification of the effect of the defects on the electrochemical energy storage performance of the cell are not trivial tasks. Herein, we report the quantification of vanadium-defective clusters (i.e., up to 5.7%) in the V2O3 lattice via neutron and X-ray powder diffraction measurements, positron annihilation lifetime spectroscopy, and synchrotron-based X-ray analysis. When the vanadium-defective V2O3 is employed as cathode active material in an aqueous Zn coin cell configuration, capacity retention of about 81% after 30,000 cycles at 5 A g−1 is achieved. Density functional theory calculations indicate that the vanadium-defective clusters can provide favorable sites for reversible Zn-ion storage. Moreover, the vanadium-defective clusters allow the storage of Zn ions in V2O3, which reduces the electrostatic interaction between the host material and the multivalent ions.

Date: 2021
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DOI: 10.1038/s41467-021-27203-w

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