Molybdenum dichalcogenide cathodes for aluminium-ion batteries
Abstract
Many successful battery electrodes are based on 2D-layered materials. We have studied aluminium-ion batteries using molybdenum dichalcogenides: MoS2, MoSe2 and MoSSe as active cathode materials. The batteries showed clear discharge voltage plateaus in the ranges 1.6 - 1.4 V for MoS2 and MoSe2, and 0.6 - 0.5 V for MoSSe. MoS2 and MoSe2 have similar crystal structures, interestingly we found that MoSe2 performed better than MoS2. MoSSe exhibited a higher specific capacity over MoS2 and MoSe2, but the energy density was lower than MoSe2 at a current rate of 40 mA g-1. MoSe2 cells recorded 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 were stable at 100 mA g-1 for over 200 cycles with 90\% coulombic efficiency.
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