Metal‐Phosphonate‐Organic Network as Ion Enrichment Layer for Sustainable Zinc Metal Electrode with High Rate Capability

Zinc (Zn) metal batteries could be the technology of choice for sustainable battery chemistries owing to its better safety and cost advantage. However, their cycle life and Coulombic efficiency (CE) are strongly limited by the dendritic growth and side reactions of Zn anodes. Herein, we proposed an...

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Veröffentlicht in:Angewandte Chemie International Edition 2024-12, Vol.63 (50), p.e202411563-n/a
Hauptverfasser: He, Xiaofeng, Qian, Yongchao, Wu, Yadong, Yan, Zidi, Lin, Xiangbin, Kong, Xiang‐Yu, Zhao, Yong, Jiang, Lei, Wen, Liping
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Sprache:eng
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Zusammenfassung:Zinc (Zn) metal batteries could be the technology of choice for sustainable battery chemistries owing to its better safety and cost advantage. However, their cycle life and Coulombic efficiency (CE) are strongly limited by the dendritic growth and side reactions of Zn anodes. Herein, we proposed an in situ construction of a metal‐phosphonate‐organic network (MPON) with three‐dimensional interconnected networks on Zn metal, which can act as an ion enrichment layer for Zn anodes in Zn‐metal batteries. This MPON with abundant porous structure and phosphate sites possesses ion enriching properties and high Zn2+ transference number (0.83), which is beneficial for enhancing Zn2+ migration and self‐concentrating kinetics. Meanwhile, MPON offers hydrophobicity to effectively inhibit the water‐induced Zn anode corrosion. As a result, the Zn electrode exhibits superior Zn/Zn2+ reversibility of over 4 months at 3 mA cm−2 and a high CE of 99.6 %. Moreover, the Zn/NaV3O8 ⋅ 1.5H2O and Zn/MnO2 full cells using ultrathin Zn anodes (10 μm) exhibit high‐capacity retention of 81 % and 78 % after 1400 and 1000 cycles, respectively. This work provides a unique promise to design high‐performance anode for practical Zn‐metal‐based batteries. The ion enriching features of the spontaneously constructed metal‐phosphonate‐organic network (MPON) on Zn metal facilitates rapid and uniform transport of Zn‐ions as well as inhibit parasitic reactions of Zn electrode, which greatly improves the reversibility of Zn anode and Zn‐metal batteries under practical conditions.
ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.202411563