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Boehmite-functionalized glass-fiber separators for selective ion transport and stable zinc deposition
Yang Wei#, Ziheng Zhong#, Enqi Lin, Yusheng Lu, Zhuangyan Li, Yu Chao, Yan Yu*, Shenghong Zhong*
https://doi.org/10.1016/j.cjsc.2026.101094
Aqueous zinc-ion batteries; Separator; Boehmite; Selective ion transport; (002) crystal planes
ABSTRACT
Aqueous zinc-ion batteries (AZIBs) are limited by heterogeneous Zn2+ transport, water-induced parasitic reactions, and sulfate-derived passivation. Here, we develop a boehmite-functionalized glass-fiber separator (BM-GF) with a hydroxyl-rich interface for coordinated ion regulation. The BM surface regulates Zn2+ distribution and weakens the interfacial H2O–H2O hydrogen-bond network through competitive hydrogen bonding. Preadsorbed water mediates BM–SO42- interactions, promoting sulfate retention and retarding crossover, while the PVDF-containing coating retards proton transport. These effects, together with mechanical reinforcement, increase the apparent Zn2+ transference number from 0.212 to 0.695, lower interfacial kinetic barriers, and suppress corrosion, hydrogen evolution, and sulfate-derived passivation. The resulting homogeneous Zn2+ supply regulates deposition kinetics and stabilizes the Zn(002) texture, promoting compact Zn deposition. Consequently, Zn||Zn cells cycle for over 4500 h at 1 mA cm-2 and 1 mAh cm-2 and for 1200 h at 15 mA cm-2 and 1 mAh cm-2, while Zn||Cu cells maintain a Coulombic efficiency of 99.79% over 1000 cycles. Zn||VO2 full cells further exhibit improved rate recovery, suppressed self-discharge, and stable long-term cycling. This work highlights separator-mediated ion regulation as an effective strategy to coordinate interfacial chemistry and Zn crystallographic growth in aqueous Zn metal batteries.
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CN 35–1112/TQ, ISSN 0254–5861, Online ISSN: 2949-768X Copyright @ 2022 Chinese Journal of Structural Chemistry-www.Chinese Journal of Structural Chemistry.net. All Rights Reserved 闽ICP备2022002645号-1