Electrolyte Design for In Situ Construction of Highly Zn2+‐Conductive Solid Electrolyte Interphase to Enable High‐Performance Aqueous Zn‐Ion Batteries under Practical Conditions

• DOI: 10.1002/adma.202007416
• Publication Date: 2021-02-14T04:56:07Z
• Authors: Xiaohui Zeng; Jianfeng Mao; Junnan Hao; Jiatu Liu; Sailin Liu; Zhijie Wang; Yanyan Wang; Shilin Zhang; Tian Zheng; Jianwen Liu; Pinhua Rao; Zaiping Guo
• Keywords: Interphase; Fast ion conductor

Abstract Rechargeable aqueous Zn‐ion batteries promise high capacity, low cost, safety, and sustainability for large‐scale energy storage. The Zn metal anode, however, suffers from the dendrite growth side reactions that are mainly due to absence of an appropriate solid electrolyte interphase (SEI) layer. Herein, in situ formation a dense, stable, highly 2+ ‐conductive SEI layer (hopeite) chemistry is demonstrated, by introducing Zn(H 2 PO 4 ) salt into electrolyte. hopeite (≈140 nm thickness) enables uniform rapid transport kinetics dendrite‐free deposition, restrains via isolating active bulk Under practical testing conditions with ultrathin anode (10 µm), negative/positive capacity ratio (≈2.3), lean (9 µL mAh −1 ), Zn/V O 5 full cell retains 94.4% its original after 500 cycles. This work provides simple yet solution high‐performance battery technology building layers.