Preparation Of Zinc/tin-based Oxide Materials And Their Lithium Storage Properties

In recent years, lithium ion battery (LIB) technology has been developed rapidly, considering its more and more important role, researchers are studying continually to improve its electrochemical properties. The work stated here is focused on complete research of the zinc/tin-based metal oxides and their composite, the structures and morphologies of the prepared samples were characterized and their electrochemical lithium storage properties were researched.Composite oxide nanomaterials show better performance in many fields. In this work, hierarchical ZnO-SnO2composite nanofibers have been prepared through single-nozzle electrospinning technique and subsequent calcinations. When used as an anode of LIB, the ZnO-SnO2composite nanofibers show first discharge and charge capacities of1795and1364mA h g-1at a current density of50mA g-1. A reversible capacity of588mA h g-1is obtained after100cycles. The material exhibits high capacity and cyclic stability can be attributed to its mesoporous nanostructures, the formation of heterostructures and the synergistic effect between ZnO and SnO2. The ZnO-SnO2composite nanofibers are expected to have potential application in LIB.For ternary metal compounds, the predominant multi-electron reaction can lead to a higher electrochemical capacity. Inverse spinel structure Zn2SnO4in cubic shape was synthesized by a hydrothermal method using low-cost reagents. The resultant product is single crystal and monodisperse. Their electrochemical performances were evaluated as anode materials of LIB, the first discharge and charge capacities of the material are1437and921mA h g-1. A higher reversible capacity of775mA h g-1was obtained after20cycles at a current density of50mA g-1with high capacity retention of84.1%. The higher reversible capacity and good stability can be related to the special microstructural features of the material.