A Nanostructured Mo2C-rGO** Heterostructure as a stable Anode with ultra-high capacity for Lithium-Ion Battery

摘要

In the present work,we have demonstrated the synthesis of Molybdenum Carbide-reduced graphene oxide(Mo2C-rGO)heterostructure.Uniquely,the in-situ formation of rGO using Dglucose in the heterostructure and its battery performance has been discussed.The High Resolution Transmission Electron Microscopy(HR-TEM)study clearly shows the growth of Mo2C nanoparticles along with rGO confers a unique integrated layered heterostructure.X-ray diffraction(XRD)and Raman study exhibits the formation of graphene oxide(GO)followed by multi-layers of rGO along with hexagonal Mo2C.The electrochemical study of Mo2C-rGO heterostructure demonstrates stable cycling performance and excellent rate capabilities.The heterostructure showed the initial capacity(1st discharge)around 632.23 mAh/g and specific capacity i.e.,537.91 mAh/g@0.5 A/g with 99-100% columbic efficiency.The reversible capacities of 521.56 mAh/g,and 400.76 mAh/g were observed at current densities of 1 A/g and 2 A/g for 300 cycles,respectively,which justifies the stability of heterostructure.The cycled cell was investigated by using Electrochemical Imepedance Spectroscopy(EIS),ex-situ XRD,and Field Emmision Scanning Electron microscopy(FESEM),which shows the negligible change in the ionic conductivity,structure,and morphology after 300 cycles.It shows the excellent stability of Mo2C-rGO heterostructure.