Molybdenum oxide/carbon composites derived from the CO2 oxidation of Mo2CTx (MXene) for lithium ion battery anodes

Abstract Multilayer Mo 2 CT x MXene is used as a precursor to produce molybdenum oxide (MoO 2 )-disordered carbon hybrid materials using a one-step CO 2 oxidation. The composites show clear, short plateaus in the charge/discharge curves as well as reversible phase transition peaks in cyclic voltammetry for the resulting MoO 2 . The electrochemical measurements support the generation of the metal oxide in the resulting composite materials. The generation of molybdenum oxide from Mo 2 CT x is verified from the plateau in Li + charge-discharge profile as wells as various characterizations of XRD, XPS, etc. The resulting MoO 2 active material coated on a copper foil shows a Li-ion capacity of 323 mAh/g at 50 mA/g (0.1 C) and 180 mAh/g at 1 A/g (4.0 C) with 85% retention for approximately 300 cycles.