Cobalt oxide based inorganic-organic hybrid composite as novel anodic material for ultra-stable Li-ion battery

Abstract

Energy demands for modern society with improved life quality are totally based on materials, which are fossils free to overcome the challenges affecting the health and climate. In the present work, a 3D hierarchical composite of Cobalt oxide@Copper Acetate@Benzenetricarboxylate (Co@CuAc@BTC) is prepared by using Cobalt oxide nanoparticles as a base material to act as an efficient anode material for LIBs. The coating of metallic organic frame work (MOF) of BTC and Cu(II)Ac alternatively, was applied through versatile layer-by-layer (LBL) assembly method. Presence of π-conjugated benzene rings in the composite was identified by analysis of FTIR. Face centered cubic crystal structure aligned with crystallographic pattern was confirmed by pXRD analysis. The surface morphology and elemental composition was predicted by SEM-EDS, Specific surface area through BET and the thermal stability through TGA analysis. Nyquist plots show that the charge transfer resistance Rct for composite is lower (377.2 Ω) comparative to Co-oxide Nps (590.2 Ω). Electrochemical studies showed that Co@CuAc@BTC composite, as an active anodic material for LIBs, exhibited a higher discharge capacity of 1380 mA h/g and remarkably good rate performance with a charge capacity of 1060 mA h/g at 100 mA/g with 78% (10% increase comparative to that of Co-oxide Nps) initial columbic efficiency. At 100th cycle material show 97% columbic efficiency with reversible capacity of 1064 mA h/g. outstanding electrochemical performance of Co@CuAc@BTC composite offers an easy, large-scale and low cost route to produce anode materials for LIBs.