Boosting the zinc ion storage capacity and cycling stability of interlayer-expanded vanadium disulfide through in-situ electrochemical oxidation strategy

Mingyang Yang; Zhifeng Wang; Hanyu Ben; Mengxuan Zhao; Junxuan Luo; Dazhu Chen; Zhouguang Lu; Lei Wang; Chen Liu

doi:10.1016/j.jcis.2021.08.194

Boosting the zinc ion storage capacity and cycling stability of interlayer-expanded vanadium disulfide through in-situ electrochemical oxidation strategy

J Colloid Interface Sci. 2022 Feb;607(Pt 1):68-75. doi: 10.1016/j.jcis.2021.08.194. Epub 2021 Sep 1.

Authors

Mingyang Yang¹, Zhifeng Wang², Hanyu Ben², Mengxuan Zhao², Junxuan Luo², Dazhu Chen², Zhouguang Lu³, Lei Wang², Chen Liu⁴

Affiliations

¹ Guangdong Research Center for Interfacial Engineering of Functional Materials, Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, PR China; Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, PR China.
² Guangdong Research Center for Interfacial Engineering of Functional Materials, Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, PR China.
³ Guangdong Provincial Key Laboratory of Energy Materials for Electric Power, Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China.
⁴ Guangdong Research Center for Interfacial Engineering of Functional Materials, Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, PR China. Electronic address: liuchen@szu.edu.cn.

PMID: 34492355
DOI: 10.1016/j.jcis.2021.08.194

Abstract

Metallic vanadium dichalcogenides with high conductivity and large layer spacing are fantastically potential to be cathode candidates for aqueous zinc ion batteries. However, simply reliance on the reversible Zn²⁺ intercalation/deintercalation process in the layer structure of vanadium dichalcogenides makes it suffer from low specific capacity and limited cycling number. Here we report a facile in-situ electrochemical oxidation strategy to boost the zinc ion storage capacity of interlayer-expanded vanadium disulfide (VS₂·NH₃) hollow spheres with satisfying cyclic stability. The hydrated vanadium oxide (V₂O₅·nH₂O) generated from oxidized VS₂·NH₃, are endowed with reduced nanosheet size and subordinated porous structure, which provides abundant accessible sites and accelerates the zinc ion diffusion process. As a result, the VS₂·NH₃ derived cathode after the electrochemical oxidation process delivers a high reversible capacity of 392 mA h g^-1 at 0.1 A g^-1 and long cyclic stability (110% capacity retention at 3 A g^-1 after 2000 cycles). The efficient oxidation process of VS₂·NH₃ cathode and the storage mechanism in the subsequent cycles are schematically investigated. This work not only reveals the zinc ion storage mechanism of the oxidized VS₂·NH₃ but also sheds light on advanced design for high-performance Zn ion cathode materials.

Keywords: Conversion mechanism; Expanded interlayer spacing; In-situ electrochemical oxidation; Vanadium disulfide; Zinc ion batteries.