Preparation,Characterization And Lithium-ion Battery Performance Of Tin Dioxide And Carbon Composites

Lithium ion battery anode materials are divided into carbon anode materials, tinbased anode materials and transition metal nitrides anode materials, etc. As a kind ofgreen nontoxic semiconductor material, tin oxide is green, non-toxic, abundant, and hashigh theoretical specific capacity. Its preparation method is simple with low oxidationpotential which has been widely applied in gas sensors and lithium ion battery cathodematerials research in recent years. As a kind of carbon material, graphene has highconductivity and excellent mechanical properties which have caused significant researchefforts around the world. In this paper, tin oxide/carbon nanostructures has been carriedon the preparation, characterization and lithium electricity performance research andexplore its potential application in energy storage. The working mechanism of thiscomposite material is analyzed. The main contents are as follows:1. We succeeded in preparation of SnO2/graphene paper hybrid material by vacuumfiltration and chemical reduction method. We have studied the morphology, the structureand the composition of this composite nanomaterial by SEM, XRD and Ramanspectroscopy. As a high power and high energy battery anode material, the mixture ofnanostructures can be directly used in rechargeable lithium ion batteries without binder,conductive agent and collector. Due to the advanced structure features, this kind ofcompounds show very strong synergistic effect which makes the lithium ion battery havehigh energy storage stability. It can still achieve specific capacity of550mAh g-1after100cycles.2. We succeeded in preparation of SnO2/C nanotubes by single nozzle electrostaticspinning method. The SEM and TEM images can clearly show the hollow structure insidethe tubes and nozzle shape. Our method uses the principle of phase separation effectwhich makes spinning nanofibers with clear separation of cores and shells. At the sametime, the method also solves the disadvantage of low yield in previous experiments. Wemake this kind of compounds into lithium ion battery and test its electrochemicalperformance. The result shows that its reversible capacity can still remain about600mAhg-1under the current density of200mA g-1, and its specific capacity remains about300mAh g-1under the current density of4000mA g-1, which shows excellent rate dischargeperformance.