Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 4, Pages 4208-4216Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00573
Keywords
V2O5; conductive polymer; enlarged interlayer spacing; three-dimensional structure; superior zinc-ion storage
Funding
- National Natural Science Foundation of China [51874104]
- Key Technology and Supporting Platform of Genetic Engineering of Materials under States Key Project of Research and Development Plan of China [2016YFB0700600]
- Start-up Research Grant of Guangdong University of Technology, China [220413729]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515110402]
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By inserting conductive polymer into vanadium oxide, the designed PEDOT-VO material enhances the structure stability, Zn2+ intercalation/deintercalation, and electron transfer kinetics of V2O5, showing excellent electrochemical properties as cathode materials in rechargeable aqueous zinc-ion batteries.
Rechargeable aqueous zinc-ion batteries (ZIBs) are recognized as potential alternative devices for economical energy storage applications. However, the instable structure of cathodes and sluggish Zn2+ diffusion kinetics are the major challenges facing ZIBs. Here, intercalating conductive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) into vanadium oxide (named as PEDOT-VO) is designed to enhance the structure stability, Zn2+ intercalation/deintercalation, and electron transfer kinetics of V2O5. The larger interlayer spacing of 13.95 angstrom (compared to 4.38 angstrom for bare V2O5) and the three-dimensional structure are constructed by conductive polymer intercalation. As ZIB cathode materials, the asprepared PEDOT-VO cathodes deliver a high specific capacity of 370.5 mA h g(-1) at 0.5 A g(-1) and 175 mA h g(-1) even at 50 A g(-1). Moreover, the long-life cycling of over 1000 cycles with a specific capacity of 310.1 mA h g(-1) is also achieved. The superior electrochemical properties are ascribed to enlarged interlayer spacing and improved reaction kinetics. Quantification calculation results reveal that pseudocapacitance mainly contributes to the zinc-ion storage, leading to an ultrahigh rate capability.
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