金属掺杂MnS@C分级微纳结构的调控及储钠性能研究

MnS因具有较高的理论比容量、较低的氧化还原电位、成本低廉和环境友好等优点，被认为是一种具有广阔应用前景的钠离子电池负极材料。为了改善MnS基材料倍率性能和循环稳定性差的问题，目前研究普遍采用的结构微纳米化或与碳材料复合的方法只能在一定程度上提高MnS近表面的电子和离子的传输。针对该问题，本项目提出通过内部金属掺杂对MnS进行原子层面的改性和外部碳基体的微结构调控来协同提高MnS的电化学性能。本项目将重点利用多种表征手段和理论计算系统的研究掺杂金属的种类、掺杂量及碳基体的结构调控对MnS储钠性能的影响规律，阐明掺杂金属的选择及外部微环境的调控对钠离子扩散动力学、结构稳定性及相结构演化的影响机制，为制备高性能的钠离子电池材料提供新颖的研究思路和实践基础。

Manganese sulfide (MnS) is considered to be a promising anode material for sodium-ion batteries, due to its advantages of relatively high theoretical specific capacity, low redox potential, costlessness and environmental friendliness. In order to mitigate the problems of poor rate performance and cycle stability, the commonly used methods are nanostructure design and carbon hybridization, which can only improve the electrons/ions transportation near the surface of MnS to a certain extent. In response to this problem, this project proposes to synergistically improve the electrochemical performance of MnS through atomic-level metal doping and microstructure regulation of external carbon matrix. This project will focus on using a variety of characterization methods and theoretical calculations to systematically study the influence of metal dopant types, doping level and carbon matrix structure regulation on the performance of MnS sodium storage. The influence of doping metal selection and external microenvironment regulation on sodium ion diffusion kinetics, structural stability and phase structure evolution will be clarified, providing novelty and practical foundation for the preparation of high-performance sodium ion battery materials.