In Situ Construction of Fe2moc Nanostructures on Vnbc Mxene Carbon Nanofibers for Enhanced Lithium-Ion Battery Performance

Abstract

In order to overcome the limitations of the rate capability and cycling of electrodes in lithium-ion batteries, coaxial electrospinning, and hydrothermal processing are used to construct uniform Fe2MoC nanostructures on double transition metal VNbC MXene hollow multichannel carbon fibers. Interfacial self-assembly produces a stable Fe2MoC layer, which enhances the electron and ion conductivity, and the hollow structure mitigates the volume change. Through in situ XRD testing, further investigation of the lithium storage mechanism in the hollow carbon nanofibers (Fe2MoC@VNbC/HMCFs) electrode composed of Fe2MoC composite double transition metal carbides VNbC MXenes is conducted. Electrochemical tests show that the average discharge capacity (800.8 mAh g-1) of the Fe2MoC@VNbC/HMCF electrode is 41% higher than that of the VNbC/HMCF electrode. More importantly, the composite electrode delivers excellent cycling and rate performance in both the symmetrical and full cells. The excellent results reveal that the one-dimensional nanostructured electrode has immense potential in high-performance lithium-ion batteries.

Keywords: VNbC MXene, Fe2MoC, Electrospinning, Lithium-ion Battery, Carbon nanofiber