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High‐Voltage and Super‐Stable Aqueous Sodium–Zinc Hybrid Ion Batteries Enabled by Double Solvation Structures in Concentrated Electrolyte
Author(s) -
Ao Huaisheng,
Zhu Weiduo,
Liu Mengke,
Zhang Wanqun,
Hou Zhiguo,
Wu Xiaojun,
Zhu Yongchun,
Qian Yitai
Publication year - 2021
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.202100418
Subject(s) - faraday efficiency , electrolyte , aqueous solution , anode , solvation , zinc , chemical engineering , plating (geology) , materials science , inorganic chemistry , chemistry , ion , electrode , metallurgy , organic chemistry , geophysics , engineering , geology
Aqueous sodium–zinc hybrid ion batteries are attracting extensive attention due to high energy density, low cost, and environmental friendliness. Unfortunately, there are still some drawbacks associated with the low voltage and cycle performance degradation that limit their practical application. Here, a concentrated aqueous electrolyte with solvation‐modulated Zn 2+ is reported that reduces the hydrogen evolution reaction on the surface of Zn metal, avoiding the generation of ZnO and uneven deposition. Accordingly, the Zn anode exhibits 1600 h Zn plating/stripping and ≈99.96% Coulombic efficiency after 700 cycles. In addition, solvation‐modulated Na + promotes the excellent structural stability of zinc hexacyanoferrate (ZnHCF) due to the rhombohedral–rhombohedral rather than rhombohedral–cubic phase transition. A ZnHCF//Zn full cell delivers an average voltage of 1.76 V and 98% capacity retention after 2000 cycles at 5 C rates.