Facilitating Charge Reactions in Al-S Batteries with Redox Mediators.

ABSTRACT: The Al-S battery is a promising next-generation battery candidate due to high abundance of both aluminium and sulfur. However, the sluggish kinetics of the Al-S battery reactions produces very high overpotentials. Here, for the first time, it was demonstrated that the incorporation of redox mediators could dramatically improve the kinetics of Al-S batteries. On the example of iodide redox mediators, it was shown that the charging voltage of Al-S batteries could be decreased by about 0.23 V with as little as 2.3 wt% of redox mediator added as electrolyte additive. Control electrochemical measurements, without prior discharge of the battery, demonstrated that >97 % of the charge capacity was due to the desired oxidation of Al₂ S₃ and polysulfides, and X-ray diffraction

SUBMITTER: Li H 

PROVIDER: S-EPMC8453840 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature