A recyclable biomass electrolyte towards green zinc-ion batteries

Hongyu Lu, Jisong Hu, Xijun Wei, Kaiqi Zhang, Xiao Xiao, Jingxin Zhao (), Qiang Hu, Jing Yu, Guangmin Zhou () and Bingang Xu ()
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Hongyu Lu: Tsinghua University
Jisong Hu: Huazhong University of Science and Technology
Xijun Wei: Tsinghua University
Kaiqi Zhang: Harbin Institute of Technology (Weihai)
Xiao Xiao: Tsinghua University
Jingxin Zhao: The Hong Kong Polytechnic University, Hung Hom
Qiang Hu: University of Electronic Science and Technology of China
Jing Yu: School of Physics, Harbin Institute of Technology
Guangmin Zhou: Tsinghua University
Bingang Xu: The Hong Kong Polytechnic University, Hung Hom

Nature Communications, 2023, vol. 14, issue 1, 1-14

Abstract: Abstract The operation of traditional aqueous-electrolyte zinc-ion batteries is adversely affected by the uncontrollable growth of zinc dendrites and the occurrence of side reactions. These problems can be avoided by the development of functional hydrogel electrolytes as replacements for aqueous electrolytes. However, the mechanism by which most hydrogel electrolytes inhibit the growth of zinc dendrites on a zinc anode has not been investigated in detail, and there is a lack of a large-scale recovery method for mainstream hydrogel electrolytes. In this paper, we describe the development of a recyclable and biodegradable hydrogel electrolyte based on natural biomaterials, namely chitosan and polyaspartic acid. The distinctive adsorptivity and inducibility of chitosan and polyaspartic acid in the hydrogel electrolyte triggers a double coupling network and an associated synergistic inhibition mechanism, thereby effectively inhibiting the side reactions on the zinc anode. In addition, this hydrogel electrolyte played a crucial role in an aqueous acid-based Zinc/MnO2 battery, by maintaining its interior two-electron redox reaction and inhibiting the formation of zinc dendrites. Furthermore, the sustainable biomass-based hydrogel electrolyte is biodegradable, and could be recovered from the Zinc/MnO2 battery for subsequent recycling.

Date: 2023
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DOI: 10.1038/s41467-023-40178-0

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