Abstract
AbstractRechargeable aluminum‐sulfur (Al−S) batteries are regarded as the potential choice for next‐generation energy storage system with advantages of high theoretical energy density (1340 Wh kg−1), the earth abundance of the constituent electrode materials, and safe operation. Whereas the electrochemical performance of Al−S batteries is beset by its poor reversibility. In this article, we demonstrate a highly reversible Al−S battery with Al2S3 as the cathode. Mechanistic studies with electrochemical and spectroscopic methodologies identified that the enhancement in reversibility by Al2S3 cathode is attributed to the circumvention of the sluggish conversion of polysulfides to sulfur. Al2S3 cathode undergoes a faster solid to liquid conversion reaction (Al2S3↔polysulfide) than that of the sulfur cathode that suffers from slow kinetic process of solid‐to‐solid conversion (S↔Al2S3). Thus, Al−S battery composed of Al2S3 cathode delivers a highly reversible electrochemical reaction with the average Coulombic efficiency >95 % for 100 cycles.
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