An Aluminum-Sulfur Battery with a Fast Kinetic Response
RIS ID
119057
Abstract
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.
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.