Berlin 2024 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 24: Focus Session: Battery Materials – Ion Transport, Impurity Effects and Modelling (joint session KFM/MM)
KFM 24.11: Talk
Thursday, March 21, 2024, 13:15–13:35, EMH 225
Impurity Effects of AlCl3 on the Performance of Polyamide-Ionic-Liquid-based Polymer Electrolytes for Aluminium Batteries — •Mohammad Mostafizar Rahman, Amir Mohammad, Shuvrodev Biswas, Hartmut Stöcker, and Dirk C. Meyer — Institute of Experimental Physics, TU Bergakademie Freiberg
The AlCl3-Et3NHCl ionic liquid (IL) has emerged as a promising and cost-effective option for the rechargeable Al-ion battery system. The polyamide-based solid polymer electrolyte (SPE) derived from this IL was utilized for the present investigation. Six different purities of AlCl3 salts (ranging from 98 % to 99.999 %) with variable prices were used to prepare the SPEs and their performance was evaluated using various electrochemical characterization techniques. The results indicate good reversibility and Al stripping/plating behavior without impurity effects. Conductivities range from 0.19 mS/cm to 0.21 mS/cm, while stability windows span 2.70 V to 2.83 V. In addition, specific capacities range from 28 mAh/g to 39 mAh/g with no systematic effect of impurities. Overall, the electrochemical analysis shows that impurities in AlCl3 salts have minimal impact on the SPE electrochemical properties. A cost-benefit analysis indicates that utilizing a low-cost AlCl3 salt (0.027 /g) yields comparable electrolyte performance as a higher-priced (6.198 /g) high-purity salt. This discovery enables a reduction in electrolyte cost by approximately a factor of 17, consequently leading to a decrease in the overall cost of Al batteries.
Keywords: Impurity effect; Aluminium battery; Aluminium chloride; Polymer electrolyte