A non-topotactic redox reaction enabled K2V3O8 as a high voltage cathode material for potassium-ion batteries

Yusi Yang; Zhifeng Liu; Leqing Deng; Lulu Tan; Xiaogang Niu; Mustafa M. S. Sanad; Liang Zeng; Zhiping Zhu; Yujie Zhu

doi:10.1039/C9CC07996C

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A non-topotactic redox reaction enabled K₂V₃O₈ as a high voltage cathode material for potassium-ion batteries†

Yusi Yang,^a Zhifeng Liu,

^a Leqing Deng,^b Lulu Tan,^b Xiaogang Niu,^b Mustafa M. S. Sanad,^c Liang Zeng,^d Zhiping Zhu

*^a and Yujie Zhu

*^be

Author affiliations

* Corresponding authors

^a School of Chemical and Biological Engineering, Changsha University of Science & Technology, Hunan 410114, P. R. China
E-mail: zzp8389@163.com

^b School of Chemistry, Beihang University, Beijing 100191, P. R. China
E-mail: yujiezhu@buaa.edu.cn

^c Chemical & Electroprocessing Department, Central Metallurgical R & D Institute (CMRDI), Cairo, Egypt

^d Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, P. R. China

^e Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, P. R. China

Abstract

When tested as the cathode material for potassium-ion batteries, K₂V₃O₈ delivers a highly reversible capacity of over 100 mA h g⁻¹ in the voltage range of 1.5–4.5 V with 73% capacity retained after 50 cycles. Charge–discharge is achieved by a nontopotactic process between K₂V₃O₈ and KV₃O₈ (ΔV ∼ −23.4%), causing the slow capacity decay.

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Article information

DOI: https://doi.org/10.1039/C9CC07996C
Article type: Communication
Submitted: 12 Oct 2019
Accepted: 19 Nov 2019
First published: 20 Nov 2019

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Chem. Commun., 2019,55, 14988-14991

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A non-topotactic redox reaction enabled K₂V₃O₈ as a high voltage cathode material for potassium-ion batteries

Y. Yang, Z. Liu, L. Deng, L. Tan, X. Niu, M. M. S. Sanad, L. Zeng, Z. Zhu and Y. Zhu, Chem. Commun., 2019, 55, 14988 DOI: 10.1039/C9CC07996C

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