ZnSe/rGO复合材料用作高性能锂电负极研究

ZnSe/rGO Composites as Anode Materials for High-performance Li-ion Batteries

目的:为提高锂离子电池循环稳定性和倍率性能,制备具有高容量、长寿命、强导电性的负极材料。方法:Hummers法制备氧化石墨烯(GO)作为复合材料的基底物质,水热法有效合成ZnSe/rGO复合电极材料。在硒化锌高的理论容量和石墨烯强的电子导电性的协同作用下,使合成的复合材料获得优异的锂离子电池性能。结果:将ZnSe/rGO复合物作为锂电负极材料进行性能测试,相较于纯ZnSe材料,不仅具有稳定循环性能(0.5 A/g电流密度下,循环200圈容量每圈仅衰减0.097%),还具有优异的倍率性能(高达10 A/g电流密度下,容量依然保持322 mAh/g)。结论:ZnSe/rGO复合电极材料由于其独特的表面结构和增强的电导性,可以有效提高锂离子电池整体电化学性能。

Objective:To improve the cycle stability and rate performance of Li-ion batteries,the anode electrode materials with high capacity,long cycle life and high electrical conductivity were prepared.Methods:Graphene oxide(GO)was prepared by Hummers method as the substrate of the composite material,and ZnSe/rGO composites were effectively synthesized by hydrothermal method.Under the synergetic effect of high theoretical capacity of ZnSe and strong electronic conductivity of graphene,the composite materials have excellent performance for Li-ion batteries.Results:Compared with pure ZnSe materials,ZnSe/rGO composites have stable cycling performance(the capacity attenuation rate of each cycle is 0.097%after 200 cycles at a current density of 0.5 A/g)and excellent rate performance(the capacity still maintains at 322 mAh/g at a current density of 10 A/g).Conclusion:ZnSe/rGO composites,as anode materials for Li-ion batteries,can effectively improve the electrochemical performances due to the unique surface structure and high electrical conductivity.