An Aluminum-Sulfur Battery with a Fast Kinetic Response



Publication Details

Yang, H., Yin, L., Liang, J., Sun, Z., Wang, Y., Li, H., He, K., Ma, L., Peng, Z., Qiu, S., Sun, C., Cheng, H. & Li, F. (2018). An Aluminum-Sulfur Battery with a Fast Kinetic Response. Angewandte Chemie - International Edition, 57 (7), 1898-1902.


The electrochemical performance of the aluminum-sulfur (Al-S) battery has very poor reversibility and a low charge/discharge current density owing to slow kinetic processes determined by an inevitable dissociation reaction from Al 2 Cl 7 - to free Al 3+ . Al 2 Cl 6 Br - was used instead of Al 2 Cl 7 - as the dissociation reaction reagent. A 15-fold faster reaction rate of Al 2 Cl 6 Br - dissociation than that of Al 2 Cl 7 - was confirmed by density function theory calculations and the Arrhenius equation. This accelerated dissociation reaction was experimentally verified by the increase of exchange current density during Al electro-deposition. Using Al 2 Cl 6 Br - instead of Al 2 Cl 7 - , a kinetically accelerated Al-S battery has a sulfur utilization of more than 80%, with at least four times the sulfur content and five times the current density than that of previous work.

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