Wei Guan, Lijun Wang, Jiguo Tu
May 18, 2020
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Influential Citations
4
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Journal
Journal of The Electrochemical Society
Abstract
Rechargeable aluminum batteries are potentially the next generation energy storage systems, while they still suffer from unexpected positive electrodes for high-capacity aluminum batteries. For alleviating the specific capacity, in this study, antimony (Sb) is selected as the positive electrode for aluminum battery for its high theoretical capacity of 660 mAh g-1. For addressing dissolution issues of active Sb species into the electrolyte during the charge-discharge process, a special electrode design coupled with modified separators is applied. At a current density of 300 mA g-1, the specific discharge capacity can still reach 100 mAh g-1 after 1000 cycles, indicating the good long-term stability performance. More importantly, a systematical characterization is conducted to acquire a deep understanding of the energy storage mechanism of the Sb positive electrode. The characterization results from in-situ Raman reveal that energy storage process involves the incorporation of AlCl4- into Sb to generate SbCl3/SbCl5. The results apparently highlight the strategies for designing high-performance Al-Sb batteries in a rational route.