An Intrinsically Self‐Healing NiCo||Zn Rechargeable Battery with a Self‐Healable Ferric‐Ion‐Crosslinking Sodium Polyacrylate Hydrogel Electrolyte |
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| Authors: | Prof. Dr. Yan Huang Jie Liu Jiaqi Wang Mengmeng Hu Funian Mo Guojin Liang Prof. Dr. Chunyi Zhi |
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| Affiliation: | 1. Centre of Flexible and Printable Electronics, Harbin Institute of Technology, Shenzhen, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, China;3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, China;4. Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, China |
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| Abstract: | Self‐healing solid‐state aqueous rechargeable NiCo||Zn batteries are inherently safe and have a high energy density and mechanical robustness. However, the self‐healability of solid‐state batteries has only been realized by a few studies in which electron/ion‐inactive self‐healable substrates are utilized. This arises from the lack of self‐healable electrolytes. Now an intrinsically self‐healing battery has been designed that utilizes a new electrolyte that is intrinsically self‐healable. Sodium polyacrylate hydrogel chains are crosslinked by ferric ions to promote dynamic reconstruction of an integral network. These non‐covalent crosslinkers can form ionic bonds to reconnect damaged surfaces when the hydrogel is cut off, providing an ultimate solution to the intrinsic self‐healability problem of batteries. As a result, this NiCo||Zn battery with this hydrogel electrolyte can be autonomically self‐healed with over 87 % of capacity retained after 4 cycles of breaking/healing. |
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| Keywords: | batteries electrolytes ferric ions hydrogels sodium polyacrylate |
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