Binder-free V2O5/CNT paper electrode for high rate performance zinc ion battery. Issue 42 (16th October 2019)

• Record Type: Journal Article
• Authors: Yin, Bosi; Zhang, Siwen; Ke, Ke; Xiong, Ting; Wang, Yinming; Lim, Boon Kiang David; Lee, Wee Siang Vincent; Wang, Zhenbo; Xue, Junmin
• Is Part Of: Nanoscale. Volume 11:Issue 42(2019)
• Page Start: 19723
• Page End: 19728
• Publication Date: 2019-10-16
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr07458a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : This work reports a significant electrochemical performance enhancement (especially the rate performance and cycling stability) by adopting a freestanding V2 O5 /CNT composite paper (VCP) as the ZIB cathode. 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 Zn 2+ ) 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 Zn 2+, 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 V2 O5 /CNT paper electrode delivers a specific capacity of 312 mA h g −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 g −1 . Thus, this work clearly demonstrated that the freestanding electrode is a promising approach for high valence ion batteries.