Unraveling Paradoxical Effects of Large Current Density on Zn Deposition

• DOI: 10.1002/adma.202404140
• Publication Date: 2024-04-23T11:54:16Z
• Authors: Zhexuan Liu; Jiachang Liu; Xiao Xiao; Zhiyang Zheng; Xiongwei Zhong; Qingjin Fu; Shaogang Wang; Guangmin Zhou
• Keywords: Deposition

Abstract Aqueous zinc‐based batteries (ZBs) have been widely investigated owing to their intrinsic safety, low cost, and simple assembly. However, the actual behavior of Zn deposition under large current density is still a severe issue associated with obscure mechanism interpretation ZBs high loading. Here, differing from conventional understanding that short circuit induced by dendrite penetrating (10–100 mA cm −2 ), separator permeation effect unraveled illustrate paradox between smooth lifespan. Generally, dense plating morphology achieved because intensive nuclei boosted plane growth. Nevertheless, in scenes applying separators, multiplied local derived narrow channels leads rapid 2+ exhaustion, converting mode nucleation control concentration control, which eventually results circuit. This validated other aqueous metal anodes (Cu, Sn, Fe) receives similar results. Based on understanding, micro‐pore (150 µm) sponge foam proposed as separators for large‐current provide broader path mitigate effect. work provides unique perspectives coordinating fast‐charging ability anode stability ZBs.