Fe2O3/rGO纳米复合物的制备及其储锂和储钠性能

金属氧化物可通过电化学转换反应与锂离子及钠离子发生多电子可逆结构转换,是一类极具应用前景的高容量锂离子和钠离子电池负极材料。实验以氧化石墨烯和铁盐为前驱体,采用简单的溶剂法,成功将Fe₂O₃纳米单晶粒子均匀负载于石墨烯的导电片层上,获得Fe₂O₃/rGO(还原氧化石墨烯)纳米复合材料。复合电极在锂离子和钠离子电池中都表现出优异的充放电性能和循环稳定性。实验结果表明石墨烯的包覆不仅能降低Fe₂O₃发生转换反应的电荷传递阻抗,而且能够稳定电极在循环过程中带来的结构转变,极大改善电极大电流充放能力和循环稳定性。本研究为发展高容量的锂离子和钠离子电池负极材料提供了可行的途径。

Synthesis and Electrochemical Properties of Fe2O3/rGO Nanocomposites as Lithium and Sodium Storage Materials

Metal oxides are promising high-capacity anode materials for lithium and sodium-ion batteries because of the reversible multi-electron structural conversion reactions with lithium and sodium ions. In this study, Fe₂O₃/rGO (reduced graphene oxide) nanocomposites were prepared using graphene oxide sheets and ferric salt as precursors through a one-step solvothermal method. The experimental results demonstrated that the Fe₂O₃ nanocrystals were uniformly dispersed on the surface of reduced graphene oxide sheets. The nanocomposite anodes show superior charge-discharge performances and cyclability in lithium and sodium ion batteries, indicating that reduced graphene oxide sheets can reduce the charge-transfer resistance and stabilize the structure change during cycling. It suggests a potential feasibility to use these metal oxide nanocomposites as high capacity anode materials for lithium and sodium ion batteries.