Molybdenum Dichalcogenide Cathodes for Aluminum‐Ion Batteries
Shalini Divya, James H. Johnston, Thomas Nann
Abstract
Many successful battery electrodes are based on 2D‐layered materials. Aluminum‐ion batteries are studied using molybdenum dichalcogenides: MoS 2 , MoSe 2 , and MoSSe as active cathode materials. The batteries show clear discharge voltage plateaus in the ranges 1.6–1.4 V for MoS 2 and MoSe 2 , and 0.6–0.5 V for MoSSe. MoS 2 and MoSe 2 have similar crystal structures; interestingly, it is found that MoSe 2 performed better than MoS 2 . MoSSe exhibits a higher specific capacity over MoS 2 and MoSe 2 , but the energy density is lower than MoSe 2 at a current rate of 40 mA g −1 . MoSe 2 cells record a discharge capacity of ≈110 mAh g −1 with an average potential in the range of 2.0–1.8 V and 1.5–0.8 V during discharge. The cells are stable at 100 mA g −1 for over 200 cycles with 90% coulombic efficiency.