二硫化钼/石墨烯复合电极的制备及其电化学储钠性能研究

Synthesis of MoS2/RGO composite electrode and study on its electrochemical performance for sodium storage

二硫化钼(MoS2)是一种稳定、安全、廉价的钠离子电池负极材料,但是二硫化钼的本征电导率较低,限制了钠离子电池的比容量和倍率性能。利用一步水热法制备了二硫化钼和还原石墨烯(MoS2/RGO)复合体系,并用于钠离子电池负极材料中。还原石墨烯不仅能增强复合材料的导电性,而且能够提高MoS2的结构稳定性,从而提升钠离子电池的比容量和循环稳定性。电化学测试结果表明,在1 A/g的电流密度下循环250次后,MoS2/RGO复合电极的比容量仍然高达509 m A·h/g。

Molybdenum disulfide( MoS2) represents a stable,safe,and low-cost anode material for sodium-ion batteries( SIBs),which has great application prospects. However,the specific capacity and rate capability of SIBs are limited due to low intrinsic electrical conductivity of molybdenum disulfide. MoS2/RGO composite is synthesized by a novel one-step hydrothermal method and is used as anode material for SIBs.Furthermore,RGO can enhance the electrical conductivity of the composite and improve the structural stability of MoS2,thus improving specific capacity and cycle stability of SIBs. Electrochemical tests suggest that the specific capacity of MoS2/RGO composite electrode has maintained as high as 509 m A·h·g-1 after 250 cycles at 1 A·g-1.