Employing “one for two” strategy to design polyaniline-intercalated hydrated vanadium oxide with expanded interlayer spacing for high-performance aqueous zinc-ion batteries

By Yanyan Liu, Zhenghui Pan, Dan Tian, T. Hu, Hanmei Jiang, Jie Yang, Jingjing Sun, Jiqi Zheng, C. Meng, Yifu Zhang. 2020

178 citations recorded by the source corpus.

Abstract Several layer-structured hydrated vanadium oxides have been investigated for aqueous zinc-ion batteries (AZIBs), where one of the challenging issues is the relatively narrow interlayer spacing (~4.4 A for (0 0 1) plane) and the poor electronic conductivity which usually lead to the sluggish Zn2+ ions/electrons transport kinetic and the instability of structure, thus resulting in low capacity, insufficient rate capability and shortened cycling life. Herein, we have successfully employed a “one for two” strategy to design a polyaniline-intercalated hydrated V2O5 composite (PANI/V2O5) through a mild, low consumptive molecule-exchange reaction at room temperature, in which the PANI can not only expand the interlayer spacing of V2O5 which is beneficial to the fast and reversible Zn2+ ions (de)intercalation, but also further improve the specific capacity of the cathode materials. Indeed, the 3D sponge-like architectured PANI/V2O5 composite possesses an expanded interlayer spacing as large as ~14 A, which offers large space and abundant channels for efficient Zn2+ ions (de)intercalation. As a result, the as-assembled Zn//PANI/V2O5 battery exhibits a high specific capacity up to 353.6 mAh·g−1 at 0.1 A·g−1, and a stable cycling performance. Furthermore, a detailed electrochemical reaction mechanism of such a PANI/V2O5 composite cathode is investigated systematically through a series of in-depth analyses including ex-situ X-ray diffraction, and ex-situ X-ray photoelectron spectroscopy. Our finding provides an effective “one for two” strategy, introducing polyaniline macromolecules to tune the interlayer spacing and structure stability, to design high-performance cathodes for AZIBs and even other multivalent ions storages.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/ec1093806167095f9b1f8e5137599458e6a6c891