Bio‐Inspired Polyanionic Electrolytes for Highly Stable Zinc‐Ion Batteries

• DOI: 10.1002/ange.202311268
• Publication Date: 2023-08-24T13:29:16Z
• Authors: Haobo Dong; Xueying Hu; Ruirui Liu; Mengzheng Ouyang; Hongzhen He; Tianlei Wang; Xuan Gao; Yuhang Dai; Wei Zhang; Yiyang Liu; Yongquan Zhou; Dan J. L. Brett; Ivan P. Parkin; Paul R. Shearing; Guanjie He
• Keywords: Stripping (fiber); Plating (geology)

Abstract For zinc‐ion batteries (ZIBs), the non‐uniform Zn plating/stripping results in a high polarization and low Coulombic efficiency (CE), hindering large‐scale application of ZIBs. Here, inspired by biomass seaweed plants, an anionic polyelectrolyte alginate acid (SA) was used to initiate situ formation high‐performance solid electrolyte interphase (SEI) layer on anode. Attribute groups −COO − , affinity 2+ ions induces well‐aligned accelerating channel for uniform plating. This SEI regulates desolvation structure facilitates compact (002) crystal planes. Even under depth discharge conditions (DOD), SA‐coated anode still maintains stable stripping/plating behavior with potential difference (0.114 V). According classical nucleation theory, energy is 97 % less than that bare Zn, resulting faster rate. The Zn||Cu cell assembled electrode exhibits outstanding average CE 99.8 over 1,400 cycles. design successfully demonstrated pouch cells, where capacity retention 96.9 compared 59.1 anode, even cathode mass loading (>10 mg/cm 2 ).