Stable interphase chemistry of textured Zn anode for rechargeable aqueous batteries

• Published in: Science bulletin (Beijing) Vol. 67; no. 7; pp. 716 - 724
• Main Authors: Wang, Jindi, Zhang, Bao, Cai, Zhao, Zhan, Renming, Wang, Wenyu, Fu, Lin, Wan, Mintao, Xiao, Run, Ou, Yangtao, Wang, Li, Jiang, Jianjun, Seh, Zhi Wei, Li, Hong, Sun, Yongming
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-04-2022
• Subjects: Electrochemical performance; Interfacial chemistry; Rechargeable aqueous batteries; Zinc hydroxide sulfate; Zn metal anode; Zn metal anode; Electrochemical performance; Zinc hydroxide sulfate; Rechargeable aqueous batteries; Interfacial chemistry
• ISSN: 2095-9273
• DOI: 10.1016/j.scib.2022.01.010

Conformal growth of homogeneous and dense (0 0 1) plane-dominated zinc hydroxide sulfate layer was realized on (0 0 2)-textured Zn metal foil electrode, which achieved stable interface chemistry by hindering further corrosion reaction and promoting horizontal electrochemical plating of metallic Zn, thus improving the electrochemical reversibility of (0 0 2)-textured Zn electrode and aqueous Zn batteries.
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Despite the advances of aqueous zinc (Zn) batteries as sustainable energy storage systems, their practical application remains challenging due to the issues of spontaneous corrosion and dendritic deposits at the Zn metal anode. In this work, conformal growth of zinc hydroxide sulfate (ZHS) with dominating (001) facet was realized on (002) plane-dominated Zn metal foil fabricated through a facile thermal annealing process. The ZHS possessed high Zn2+ conductivity (16.9 mS cm−1) and low electronic conductivity (1.28 × 104 Ω cm), and acted as a heterogeneous and robust solid electrolyte interface (SEI) layer on metallic Zn electrode, which regulated the electrochemical Zn plating behavior and suppressed side reactions simultaneously. Moreover, low self-diffusion barrier along the (002) plane promoted the 2D diffusion and horizontal electrochemical plating of metallic Zn for (002)-textured Zn electrode. Consequently, the as-achieved Zn electrode exhibited remarkable cycling stability over 7000 cycles at 2 mA cm−2 and 0.5 mAh cm−2 with a low overpotential of 25 mV in symmetric cells. Pairing with a MnO2 cathode, the as-achieved Zn electrode achieved stable cell cycling with 92.7% capacity retention after 1000 cycles at 10 C with a remarkable average Coulombic efficiency of 99.9%.