Juchen Guo, University of California-Riverside
Reversible Electrochemical Aluminum Intercalation in Metal Sulfides
Written by Armin VahidMohammadi
Aluminum-ion batteries are considered one of the potential candidates to substitute lithium-ion batteries due to their high volumetric capacity, abundant amount of aluminum in earth, and also higher safety compared to flammable lithium-based batteries. Juchen Guo from the University of California-Riverside in the last session of this symposium (Friday), went over their interesting research on utilizing metal sulfides as potential cathodes for aluminum-ion batteries. Chevrel phase (Mo6S8) was the cathode material that was used in this research for reversible aluminum intercalation using aluminum metal as the anode. An ionic liquid was used to enable the intercalation of aluminum inside the system, and different ratios of salt to the ionic liquid were investigated to find the optimum electrolyte composition and exact mechanism of charge storage inside the system. The talk summarizes different capacitances of Chevrel phase material as well as other metal sulfides that were tested in Guo’s group for aluminum batteries and discusses the intercalation sites for the ions species inside the structure of the cathodes. The future direction for these types of cathode materials, such as making their particle size smaller to overcome the diffusion limitations, were discussed. To conclude and by considering the different talks given in this year’s MRS Fall Meeting, we can say that the future of energy storage devices lies in different battery systems beyond lithium-ion batteries due to the many advantages they can provide but there is still a long way left to make them actually market-ready.