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Article Abstract
As an alternative to pure lithium-ion, Li, systems, a hybrid magnesium, Mg, and Li battery can potentially combine the high capacity, high voltage, and fast Li intercalation of Li-ion battery cathodes and the high capacity, low cost, and dendrite-free Mg metal anodes. Herein, we report on the use of two-dimensional titanium carbide, TiCT (MXene), as a cathode in hybrid Mg/Li batteries, coupled with a Mg metal anode. Free-standing and flexible TiCT/carbon nanotube composite "paper" delivered ∼100 mAh g at 0.1 C and ∼50 mAh g at 10 C. At 1 C the capacity was maintained for >500 cycles at 80 mAh g. The MoCT MXene also demonstrated good performance as a cathode material in this hybrid battery. Considering the variety of available MXenes, this work opens the door for exploring a new large family of 2D materials with high electrical conductivity and large intercalation capacity as cathodes for hybrid Mg/Li batteries.
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