(193ax) Carbon-Molybdenum Oxide Composites Synthesized through CO2 Conversion from Mxene (Mo2CTx) As Anode of Lithium Ion Battery

The synthesis of high valuable materials through CO₂ conversion can contribute to mitigating global warming. As a typical example, a method of synthesizing porous carbon or graphite-based carbon under high pressure has been widely studied. However, in this paper, we synthesized composites of carbon and metal oxide by converting the MXene under CO₂ conditions. More specifically, a molybdenum oxide (MoO₂)-amorphous carbon composite was synthesized in a single step by heating Mo₂CT_x at 700℃ under CO₂ flow. The carbon of the synthesized composites retained the 2D structure observed in the MXene, and the molybdenum oxide (MoO₂) was synthesized between the carbon layers. The resultant material was tested for anode of lithium ion battery. In cyclic voltammetry, it has clear peaks due to the reversible lithiation/delithiation reaction of MoO₂. The accurate capacity value was confirmed by Galvanostatic test, and the capacity of resultant hybrid material was 323 mAh/g at 50 mA/g (0.1 C) and 180 mAh/g at 1 A/g (4.0 C). In addition, it maintains the capacity of 85% after 280 cycles at 300 mA/g (0.9 C) while its coulombic efficiency converges to 99%. This method using CO₂ as both mild oxidant and carbon source enabled the one-step synthesis of a carbon-metal oxide hybrid material maintaining 2D structure of MXene, and improve the overall performance for lithium-ion battery anode.