Improved Lithium Ion Behavior Properties of TiO2@Graphitic-like Carbon Core@Shell Nanostructure

Abstract

We demonstrate TiO2@graphitic-like carbon core@shell (TiO2@C) nanostructures using chemical vapor deposition as the heating process under a CH4 atmosphere at 700°C (TiO2@C-700). The TiO2@C-700 nanostructure consists of a TiO2 core coated by a carbon shell. The carbon shells on TiO2 nanostructures generally have 2∼3 layers exhibiting graphitic-like properties. The TiO2@C-700 nanostructure is homogeneously covered with a graphite-like carbon layer, resulting in excellent contact between the TiO2 and carbon and improving the electrical conductivity. The improved specific capacity and electrochemical properties of the TiO2@C-700 nanostructure are attributed to the graphitic-like carbon acting as a conductive region, resulting in improved electron transport properties on the electrode surface and enhanced lithium ion intercalation, leading to lower charge transfer resistance and high diffusion coefficient. The combination of electrochemical data and structural properties of the TiO2@C-700 nanostructure makes it a promising candidate for the anode in lithium ion batteries.