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Binder-free V2O5/CNT paper electrode for high rate performance zinc ion battery

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Abstract

Organic compounds, such as polyvinylidene fluoride (PVDF), have been widely used as a binder in battery electrode preparations. While such an approach does not have a significant impact on the performance of the batteries that utilize low valence ions, such as the Li ion battery (LIB), the diffusion of high valence ions (such as Zn2+) will be severely impaired. This will be especially pronounced if the polymeric binder contains highly electronegative atoms, such as fluorine. The high charge density ions, such as Zn2+, tend to adsorb onto these electronegative atoms, thus the mobility of these ions across the material is inevitably affected. As such, it becomes highly necessary to consider the binder-free electrode architecture when designing a high rate performing and cycling-stable zinc ion battery (ZIB) cathode. Herein, this work demonstrates an improved Zn ion battery by adopting a freestanding electrode. The obtained V2O5/CNT paper electrode delivers a specific capacity of 312 mA h gāˆ’1, while achieving a respectable 75% retention in capacity after increasing the current density by 10-fold. Furthermore, excellent cycling stability is recorded with 81% capacity retention after 2000 cycles at 1.0 A gāˆ’1. Thus, this work clearly demonstrated that the freestanding electrode is a promising approach for high valence ion batteries.

Graphical abstract: Binder-free V2O5/CNT paper electrode for high rate performance zinc ion battery

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Publication details

The article was received on 29 Aug 2019, accepted on 27 Sep 2019 and first published on 02 Oct 2019


Article type: Communication
DOI: 10.1039/C9NR07458A
Nanoscale, 2019, Advance Article

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    Binder-free V2O5/CNT paper electrode for high rate performance zinc ion battery

    B. Yin, S. Zhang, K. Ke, T. Xiong, Y. Wang, B. K. D. Lim, W. S. V. Lee, Z. Wang and J. Xue, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR07458A

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