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Molecular Interfacial Chelation Enables Wide-Temperature Aqueous Zinc-Ion Batteries
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DOI：10.1002/eem2.70384.png)
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Abstract
En 中文
In the past few years, aqueous zinc-ion batteries (AZIBs) have attracted considerable interest as a grid-scale energy storage technology. Nonetheless, the wide-temperature performance of AZIBs remains greatly restricted, mainly as a result of side reactions, dendrite growth, and sluggish kinetics. Here, a trace amount of amino acid-chelated zinc additive (zinc methionine sulfate) effectively enhances the wide-temperature adaptability of AZIBs from -20 to 60 degrees C through a unique ion-buffering reservoir mechanism. The additive release Zn2+ in the microenvironment of the electrode/electrolyte interface, forming a zinc-rich ion buffer reservoir. The high Zn2+ concentrations at anode surface provide adequate Zn2+ even at high current densities, suppressing dendrite growth and side reactions caused by rapid depletion of Zn2+. Moreover, the additive also induces preferential deposition on the Zn(002) crystallographic plane and participates in forming a uniform and zincophilic solid electrolyte interphase. Thereby, Zn||Zn cells with designed electrolyte exhibit cycle lifetimes of 3772 h (-20 degrees C), 1980 h (25 degrees C), and 410 h (60 degrees C). The Zn||ZnxV2O5 & centerdot;nH2O full cell with designed electrolyte demonstrates an initial discharge capacity of 180.8 mA h g-1 and a capacity retention of 82.0% after 3000 cycles at -20 degrees C.
Keywords:
chelate additive
interface regulation
ion-buffering reservoir
wide-temperature aqueous zinc-ion batteries
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Journal
E
IF:
14.1
Papers:
294
Citations:
0