Three-electron reversible redox for a high-energy fluorophosphate cathode: Na3V2O2(PO4)2F

Manhua Peng; Dongtang Zhang; Xiayan Wang; Dingguo Xia; Yugang Sun; Guangsheng Guo

doi:10.1039/C9CC00504H

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Three-electron reversible redox for a high-energy fluorophosphate cathode: Na₃V₂O₂(PO₄)₂F†

Manhua Peng,^a Dongtang Zhang,^a Xiayan Wang,

*^a Dingguo Xia,^b Yugang Sun

^c and Guangsheng Guo^a

Author affiliations

* Corresponding authors

^a Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing 100124, P. R. China
E-mail: xiayanwang@bjut.edu.cn

^b Key Lab of Theory and Technology for Advanced Batteries Materials, College of Engineering, Peking University, Beijing 100871, P. R. China

^c Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, USA

Abstract

A three-electron structural reaction for Na₃V₂O₂(PO₄)₂F (Na₃VOPF) in space group I4/mmm shows a priori stabilisation in terms of long-life in the voltage range of 2.0–4.5 V, with embedding of more than one sodium ion to generate Na₅VOPF upon discharge to 1.0 V in the first cycle, thereby increasing the specific capacity from ∼170 mA h g⁻¹. The capacity of the crystals was 180 mA h g⁻¹ after 20 cycles. The results provide a probable route to improve fluorophosphate cathode performance.

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Article information

DOI: https://doi.org/10.1039/C9CC00504H
Article type: Communication
Submitted: 20 jan 2019
Accepted: 28 feb 2019
First published: 01 mar 2019

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Chem. Commun., 2019,55, 3979-3982

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Three-electron reversible redox for a high-energy fluorophosphate cathode: Na₃V₂O₂(PO₄)₂F

M. Peng, D. Zhang, X. Wang, D. Xia, Y. Sun and G. Guo, Chem. Commun., 2019, 55, 3979 DOI: 10.1039/C9CC00504H

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