SnO_2 nanorods grown on MCMB as the anode material for lithium ion battery

摘要

Chemical precipitation and hydrothermal reaction were adopted to prepare the SnO_2 nanorods/MCMB composite. Firstly Mesophase carbon micro beads (MCMB) were treated by the mixture of concentrated sulphuric acid and nitric acid, and then deposited with a little amount of SnO_2 though chemical precipitation to form the primitive SnO_2/MCMB composite. In hydrothermal condition and at certain concentration of Na_2SnO_3, such primitive composite turned into the SnO_2 nanorods/MCMB composite eventually. SEM figures showed that SnO_2 nanorods grow on the surface of MCMB extensively; TEM and XRD characterization indicated SnO_2 nanorods presenting good single crystalline structure with 50 nm in diameter and 400-500 nm in length. The following electrochemical performance showed that the final composite exhibited initial discharge capacity of 1321.25 mA h g~(-1). Reversible capacity of 505.8 mA h g~(-1) was observed after 50 discharge/charge cycles at the constant current density of 100 mA g~(-1) etc.