金属集流体表面MoS2-C耦合多层薄膜电极的构筑及其电化学储锂储纳机理

Because of its unique layered structure, molybdenum sulfide (MoS2) has a good potential application in lithium and sodium storage for the further development of lithium (sodium) secondary batteries. This project aims to controllably fabricate the MoS2-C (graphene or ultrathin amorphous carbon) coupled multilayer films on metallic current collector with atomic layer deposition (ALD) technique and investigate the influences the ultrathin carbon layer on the interface structure of MoS2, the electrochemical behavior of the MoS2-C coupled film at different charge/discharge rates, the transport properties of Li+ (Na+) at the interface of MoS2 and ultrathin carbon layer as well as the surface of the MoS2-C film electrode. By the analysis of the electrochemical coupling effect of the graphene-like MoS2 and the carbon interlayer, the relationship between the structure of the ultrathin carbon layer and the electrochemical performance of the MoS2-C film electrode will be obtained. In-situ TEM and XRD techniques will be used to reveal the Li+/Na+ storage mechanisms of the layered MoS2 electrode. The target of this project is to obtain the MoS2-C coupled multilayer films with high specific capacity, outstanding rate capability and cycling performance. This project would also provide important theoretical and experimental foundation to improve the rate and cycling performance of layered chalcogenide type electrodes.

层状结构二硫化钼（MoS2）由于具有较高的储锂、储钠理论容量，在新型锂、钠离子二次电池技术方面有良好的应用前景。本项目设计并通过原子层沉积（ALD）技术在金属集流体表面可控制备MoS2-C（石墨烯或超薄非晶态碳）耦合多层薄膜。研究不同形态超薄耦合碳层对层状MoS2界面结构的影响作用、不同充放电条件下MoS2-C耦合薄膜电极的电化学行为、锂（钠）离子在MoS2-C耦合界面和电极表面的传输特性。通过分析类石墨烯结构MoS2与层间嵌入超薄碳层的电化学耦合效应，建立超薄耦合碳层的结构形态与MoS2-C薄膜电极电化学性能的相互关系。结合原位TEM和XRD电化学分析技术，阐明层状结构MoS2电极的电化学储锂储钠机理。获得具有高比容量、优异倍率性能和循环稳定性的MoS2-C耦合薄膜电极，为提高锂、钠二次电池高容量层状结构硫化物电极的倍率性能和循环稳定性提供重要的理论基础和实验依据。

层状结构二硫化钼（MoS2）由于具有较高的储锂、储纳理论容量，在新型锂、纳离子二次电池技术方面有良好的应用前景。本项目设计并通过原子层沉积、化学气相沉积等技术在金属集流体表面可控制备MoS2-C（石墨烯或超薄非晶态碳）耦合多层薄膜。研究不同组织结构超薄耦合碳层对层状MoS2界面结构的影响作用、不同充放电条件下MoS2-C耦合薄膜电极的电化学行为、锂（钠）离子在MoS2-C耦合界面和电极表面的传输特性。通过分析类石墨烯结构MoS2与层间嵌入超薄碳层的电化学耦合效应，建立超薄耦合碳层的结构形态与MoS2-C薄膜电极电化学性能的相互关系。结合原位TEM、XRD和XPS及电化学分析技术，阐明了层状结构MoS2电极的电化学储锂储纳机理，获得具有高比容量、优异倍率性能和循环稳定性的MoS2-C耦合薄膜电极，为提高锂、纳二次电池高容量层状结构过渡金属硫化物电极的倍率性能和循环稳定性提供重要的理论基础和实验依据。