Simultaneously constructing solid cathode/anode-electrolyte interphase by anions decomposition in aqueous Zn battery

•Regulating the HOMO-LUMO of solvation complexes promotes the decomposition of anions.•Simultaneously constructing flexible and robust CEI/SEI in aqueous Zn battery.•SEI suppresses interface side reactions and stabilizes Zn plating/stripping.•CEI improves the lifespan of vanadium oxide cathode at lo...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2025-01, Vol.503, Article 158241
Main Authors: Zhu, Chaoqiong, Ruan, Hao, Zheng, Limin, Dong, Xiaodong, Pu, Zewei, Wan, Fang, Guo, Xiaodong
Format: Article
Language:English
Subjects:
Aqueous Zn batteries
Low current density
Solid electrode–electrolyte interphase
Solvation structure
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Summary:•Regulating the HOMO-LUMO of solvation complexes promotes the decomposition of anions.•Simultaneously constructing flexible and robust CEI/SEI in aqueous Zn battery.•SEI suppresses interface side reactions and stabilizes Zn plating/stripping.•CEI improves the lifespan of vanadium oxide cathode at low current density. Aqueous Zn batteries exhibit enormous potential in large-scale energy storage. However, complex interfacial side reactions between electrode and electrolyte fast deteriorate the electrochemical performance. Directly constructing solid electrode–electrolyte interphase is an effective strategy to enhance the interface stability, while it is difficult to form solid electrode–electrolyte interphase in conventional electrolytes. Herein, propylene carbonate was introduced into water-in-salts electrolytes to regulate Zn2+ solvation structure, which reduces the HOMO and LUMO energy gap of Zn2+ solvation complexes. As a result, anion-derived cathode-electrolyte interphase (CEI) and anode-electrolyte interphase (SEI) are formed simultaneously. Assembled Zn||Zn symmetrical cell achieves high cycling stability over 9000 h at 8 mA cm−2 with 8 mAh cm−2. Moreover, Zn||AlxV2O5·nH2O battery displays excellent cycling performance at low current density (capacity retention rate of 92 %/94 % after 400/1300 cycles of 0.2/0.5 A g−1). This work provides a simple and effective strategy to simultaneously construct CEI layer and SEI layer, achieving long life aqueous Zn batteries.
ISSN:1385-8947
DOI:10.1016/j.cej.2024.158241