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Sustainable Clay Electrolytes for Aqueous Batteries: All-Temperature Single-Ion Conductor with Nanoconfined Hydration Shell Reorganization Effect
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DOI：10.1002/adma.202510668.png)
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Abstract
En 中文
Ion transport property and water structure of electrolytes are two of the most important issues for aqueous batteries, especially when operated at extreme temperatures. To this end, a sepiolite-based clay electrolyte (SCYE) with nanoconfined channels as single-ion conductor is proposed. The inner Zn2+ and anions solvation shells exhibit fascinating hydration-shell reconfiguration behavior compared to the conventional Zn(ClO4)2 aqueous electrolytes. The bond-orientational order of the Zn2+ and anions is broken and highly developed, respectively, thus improving the Zn2+ transference number to 0.97. Moreover, free water molecules are dramatically reduced in the SCYE, contributing to improved anti-freezing ability and thermal stability. The single-ion transport property of the SCYE endows the PANI||Zn full cells with excellent rate performances, with an approximate to 84% capacity retention from 1 to 20 A g-1. Besides, full cells with the SCYE achieve 17,000 cycles under -40 degrees C with a specific capacity of 130 mAh g-1 at 1 A g-1 and considerable performances even at -60 degrees C, while they can operate over 3000 cycles at 60 degrees C with 87% capacity retention. This attracting effect can be expanded to several other clay materials, all presenting improved ion transport capability, which paves a road for future aqueous batteries across extreme temperatures.
Keywords:
aqueous batteries
clay electrolytes
nanoconfined hydration shell reorganization
single-ion conductor
Journal
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26.8
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3.4W
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