Issue 48, 2021

VO2(B)@carbon fiber sheet as a binder-free flexible cathode for aqueous Zn-ion batteries

Abstract

With the increase in the demand for future deformable and wearable devices, flexible aqueous zinc-ion batteries are deemed to show promise as a flexible electronic power supply. In this study, a type of a binder-less cathode material with a mass loading of 4.5 mg cm−2 is successfully synthesized by a one-pot solvothermal method. By using a VO2(B)@CFS (carbon fiber sheet) nanoflake array as the cathode material in zinc-ion batteries, the specific discharge capacity of the VO2(B)@CFS nanoparticle array reaches up to 386.2 mA h g−1 at 0.2 A g−1, with an 88.6% capacity retention after 100 cycles; the excellent electrochemical performance is mainly attributed to the rapid ion or electron transfer rendered by the CFS-supported nano-chip array structure. Moreover, the electrochemical performance of VO2(B)@CFS using the cost-effective ZnSO4 electrolyte is compared with that using the Zn(CF3SO3)2 electrolyte. In addition, two assembled 3 cm × 1 cm Zn/VO2(B)@CFS flexible batteries connected in series can power a small light-emitting diode (LED) for up to 150 h without going out, providing a suitable design for a flexible cathode in aqueous zinc-ion batteries. This excellent cathode material is an ideal material for high-power flexible water-borne zinc-ion batteries.

Graphical abstract: VO2(B)@carbon fiber sheet as a binder-free flexible cathode for aqueous Zn-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
02 Sept. 2021
Accepted
12 Nov. 2021
First published
12 Nov. 2021

CrystEngComm, 2021,23, 8650-8659

VO2(B)@carbon fiber sheet as a binder-free flexible cathode for aqueous Zn-ion batteries

X. Li, L. Yang, H. Mi, H. Li, M. Zhang, A. Abliz, F. Zhao, S. Wang and H. Li, CrystEngComm, 2021, 23, 8650 DOI: 10.1039/D1CE01188J

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