A two-dimensional conductive polymer/V2O5 composite with rapid zinc-ion storage kinetics for high-power aqueous zinc-ion batteries. Issue 33 (9th August 2022)

• Record Type: Journal Article
• Authors: Wang, Bo; Dai, Simin; Zhu, Zehao; Hu, Lin; Su, Zhen; Jin, Yingzhi; Xiong, Liukang; Gao, Jiasong; Wan, Jun; Li, Zaifang; Huang, Liang
• Is Part Of: Nanoscale. Volume 14:Issue 33(2022)
• Page Start: 12013
• Page End: 12021
• Publication Date: 2022-08-09
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr03147g
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A unique conducting polymer intercalation strategy is developed to optimize the ion/electron transport of V2 O5 based aqueous zinc-ion batteries (ZIBs). It presents a new tactic to construct a high-performance and durable ZIB cathode. Abstract : Vanadium oxides represent a promising cathode material for aqueous zinc ion batteries (ZIBs) owing to their abundant valences and versatile cation-storage capacities. However, the sluggish Zn 2+ diffusion kinetics in the V2 O5 framework and poor intrinsic conductivity result in inferior rate capability and unsatisfactory cycling performance of the V2 O5 cathode, and thus limits its commercial-scale deployment. Herein, a unique conducting polymer intercalation strategy is developed to optimize the ion/electron transport simultaneously based on the rational design of the composite structure and morphology. The poly(3, 4-ethylenedioxythiophene) (PEDOT) intercalated V2 O5 not only remarkably enlarges the interlayer distance for facile Zn 2+ diffusion, but also diminishes the electron transport resistance by the π-conjugated structure of PEDOT. Additionally, the two-dimensional (2D) morphology enables shorter ion diffusion paths as well as a larger number of exposed sites for Zn 2+ insertion. As a result, the PEDOT-intercalated V2 O5 (PEDOT/V2 O5 ) exhibits a good high-rate performance (154 mA h g −1 at an ultrahigh current density of 50 A g −1 ) and a long-term cycling life (maintains 170 mA h g −1 even after 2500 cycles at 30 A g −1 ). This universal strategy provides a design principle for constructing efficient Zn 2+ and electron transport pathways within cathode materials, holding great potential for the development of high-performance and durable ZIB cathodes.