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A self-healing hydrogel electrolyte towards all-in-one flexible supercapacitors

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Abstract

The self-healing electrolytes play an essential role in self-healing supercapacitors. Herein, poly (vinyl alcohol)/sulphuric acid (PVA/H2SO4) hydrogel electrolytes with self-healing properties are prepared, which has been achieved by dynamic hydrogen bonds between PVA chains. The obtained PVA hydrogel displays fast self-healing capability, reliable mechanical performance (stress at 0.29 MPa after stretching to 238%) and high ionic conductivity (57.8 mS cm−1). Based on these excellent properties, an all-in-one self-healing supercapacitor is assembled by in situ polymerization of aniline on the surface of PVA/H2SO4 hydrogel electrolyte. The assembled all-in-one supercapacitor shows outstanding capacitance performance (specific capacitance 504 mF cm−2 at current density of 0.2 mA cm−2 and energy density 35 μWh cm−2 at power density 100 μW cm−2), good cycle stability (after 5000 cycles of charging and discharging, the capacitance retention rate is 77%), excellent flexibility and considerable self-healing performance (69% capacitance retention rate after the fifth self-healing cycle). This self-healing supercapacitor will promote the development of self-healing energy storage devices in wearable electronics.

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Acknowledgements

This research was supported by “the Fundamental Research Funds for the Central Universities” (Grant 2019XKQYMS03).

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Authors and Affiliations

  1. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Wen-Bin Ma, Ke-Hu Zhu, Shi-Fang Ye, Yao Wang, Lin Guo, Xue-Yu Tao, Li-Tong Guo, He-Liang Fan, Zhang-Sheng Liu & Ya-Bo Zhu

  2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Xian-Yong Wei

  3. Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Xian-Yong Wei

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  1. Wen-Bin Ma
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Ma, WB., Zhu, KH., Ye, SF. et al. A self-healing hydrogel electrolyte towards all-in-one flexible supercapacitors. J Mater Sci: Mater Electron 32, 20445–20460 (2021). https://doi.org/10.1007/s10854-021-06555-5

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