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Constructing oxygen deficiency-rich V2O3@PEDOT cathode for high-performance aqueous zinc-ion batteries

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Abstract

Aqueous zinc-ion batteries (AZIBs) have attracted widespread attention due to the advantages of high safety and environmental friendliness. Although V2O3 is a promising cathode, the strong electrostatic interaction between Zn2+ and V2O3 crystal, and the sluggish reaction kinetics still limit their application in AZIBs. Herein, the oxygen defects rich V2O3 with conducive poly (3,4-ethylenedioxythiophene) (PEDOT) shell (V2O3-Od@PEDOT) was fabricated for AZIBs by combining the sulfur-assisted thermal reduction and in-situ polymerization method. The introduced oxygen vacancies of V2O3–Od@PEDOT weaken the electrostatic interaction between Zn2+ and the host material, improving the interfacial electron transport, while the PEDOT coating enhances the structural stability and conductivity of V2O3, thus accelerating the reaction kinetics. Based on the advantages, V2O3–Od@PEDOT electrode delivers a reversible capacity of 495 mAh·g−1 at 0.1 A·g−1, good rate capability (189 mAh·g−1 at 8.0 A·g−1), and an impressive cycling stability with 90.1% capacity retention over 1000 cycles at 8.0 A·g−1. The strategy may provide a path for exploiting the other materials for high performance AZIBs.

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摘要

水系锌离子电池(AZIBs)因其安全性高、环境友好等优点而受到广泛关注。V2O3作为一种很有前途的正极材料, 由于Zn2+与V2O3之间的强静电相互作用, 导致离子反应动力学缓慢, 限制了其在锌离子电池中的应用。本研究通过硫辅助热还原和原位聚合相结合的方法, 制备了聚(3,4-乙烯二氧噻吩)包覆的富含氧缺陷的V2O3/PEDOT(V2O3-Od@PEDOT)复合材料。V2O3-Od@PEDOT中引入的氧缺陷有效削弱了Zn2+与宿主材料之间的静电相互作用, 改善了界面电子转移。同时, PEDOT包覆层有效地增强了V2O3的结构稳定性和导电性, 从而进一步加快了反应动力学。基于以上优点, V2O3-Od@PEDOT电极在0.1 A·g-1电流密度下具有495 mAh·g-1的高可逆容量, 良好的倍率性能(8.0 A·g-1条件下容量为189 mAh·g-1), 以及优异的循环稳定性能, 在8.0 A·g-1的电流密度下经过1000次循环后容量保留率为90.1%。该策略为开发高性能锌离子电池的电极材料提供了新的途径。

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (No. 22165028) and the Nature Science Foundation of Gansu Province (No. 20JR10RA108).

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  1. Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, School of College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China

    Dong-Fei Sun, Zi-Juan Wang, Tian Tian, Xin Yu, Dan-Dan Yu, Xiao-Zhong Zhou, Guo-Fu Ma & Zi-Qiang Lei

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Sun, DF., Wang, ZJ., Tian, T. et al. Constructing oxygen deficiency-rich V2O3@PEDOT cathode for high-performance aqueous zinc-ion batteries. Rare Met. 43, 635–646 (2024). https://doi.org/10.1007/s12598-023-02434-6

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