Enhanced Battery Performance of Disordered Carbon and Graphene Double Coated SnO2 Hollow Spheres

Abstract

Innovative development of IT technology has resulted in an explosive usage of portable electronic devices and in modern life. Besides, obtaining green energy and storing it have emerged as an important issue due to environmental problems. To fulfill the crucial requirements of energy sources of these days, high-performance batteries, which are essential for the wide range of electro-technology, from the electronic devices to vehicles, have been researched. Li-ion batteries are currently the most used energy storage device. Many anode materials for Li-ion battery are actively studied to overcome the low capacity limit of carbon material. SnO2 is one of the most candidate anode materials with high capacity, but it has volume expansion problem inducing pulverization of electrode material during cycling. In this research, disordered carbon and reduced graphene oxide are doubly coated to SnO2 hollow spheres which consist of SnO2 nanoparticles. Conformal carbon and reduced graphene oxide coating provide SnO2 hollow spheres with electronic pathway and buffer effect to prevent electrical losses of electrode. SnO2 hollow spheres are simply synthesized by hydrothermal method and also carbon coting is also modified by hydrothermal method. And then APTES surface modification is applied on carbon coated SnO2 hollow spheres to coat tightly with graphene oxide through electrostatic interaction. Coated disordered carbon layer provide an electronic pathway to inner space of hollow sphere through porous hollow shell. Reduced graphene layer wrap several SnO2 hollow spheres which provides electronic path to the entire electrode. Each coating material effect enhances the battery performance of SnO2 hollow spheres.