氧化石墨烯浓度对还原氧化石墨烯/ZnS电化学性能的影响

Effect of graphene oxide concentration on the electrochemical properties of reduced graphene oxide/ZnS

以氧化石墨烯(GO)、乙酸锌(Zn(CH_(3)COO)_(2))和硫脲为原料,采用水热法成功制备了还原氧化石墨烯/ZnS(rGO/ZnS)复合材料,并将该材料用作锂离子电池负极。高导电性的rGO可以为锂离子和电子的传输提供有效的路径,ZnS可以提供较高的理论比容量。rGO/ZnS复合材料在rGO与纳米级高度分散的类球形ZnS颗粒协同作用下展现了较好的嵌锂容量和循环性能。当GO质量浓度为2 mg·mL^(-1)时制备的rGO/ZnS复合材料的倍率性能最好,循环稳定性最佳。

Reduced graphene oxide/ZnS(rGO/ZnS)composites were successfully prepared by hydrothermal method using graphene oxide(GO),zinc acetate(Zn(CH_(3)COO)_(2)),and thiourea as raw materials.The microstructure and morphology of the sample were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM),etc.The material was used as anodes for lithium-ion batteries,and electrochemical test results demonstrated that the as-prepared rGO/ZnS composite exhibited significantly enhanced electrochemical lithium storage performance in comparison to rGO.The highly conductive rGO can provide an efficient path for the transport of lithium ions and electrons,and ZnS can provide a high theoretical specific capacity.The rGO/ZnS composites exhibited good lithium intercalation capacity and cycling performance under the synergistic effect of rGO and nanoscale highly dispersed spherical ZnS particles.When the GO mass concentration was 2 mg·mL^(-1),the rGO/ZnS composites had the best rate performance and the best cycling stability.