石墨烯修饰的新型轻质稀土金属间化合物及其高容量储能特性研究

我国稀土资源综合利用和能源危机均面临严重问题，开发高性能稀土储能金属间化合物是有望解决该问题的一项紧迫研究任务。本项目立足于低成本、高品质新型稀土储能材料开发，通过相图分析和理论计算进行成分优化设计，开展Y、La、Ce等轻质稀土金属间化合物的探索研究，实现稀土储能材料在高储氢和高储电容量方面的双向重大突破。项目创新性地采用石墨烯作为表面修饰材料，探索用低温双等离子体法和等离子体辅助球磨法完成纳米晶稀土金属间化合物和表面修饰的同步制备，以期改善合金导电性、抗粉化性、抗氧化性和耐腐蚀特性，进而提高合金的充放电效率、活化特性和循环稳定性，最终获得具有高储氢储电容量、循环稳定性好、操作温度低、动力学性能优异的石墨烯修饰稀土储能合金，这对于实现新型轻质稀土储能金属间化合物的产业化和我国稀土资源的综合利用具有重要的战略意义。

The study of rare earth-based energy storage alloys with high performance is of critical importance to solve the comprehensive utilization of rare earth resources and energy crisis. In order to meet the needs of industrialization of rare earth-based energy storage materials and development of society, this project explores a new type of light rare earth (La, Y, Ce)-based intermetallic compounds with low cost. By analyzing the phase diagram and theoretical arithmetic, the component designation is optimized for aim at pursuing a material with a high capacity both in hydrogen storage and electron storage. Furthermore, graphene is applied to modify the surface of the alloys for the first time. The modification can increase the electric conduction, anti-pulverization and anti-oxidation of the alloys contributing to the improvement of charge-discharge efficient，activation and cyclic stability. By double plasma reaction method and plasma assisted ball milling method, the preparation of rare earth-based intermetallic compounds and modification of graphene can be completed in one step. Acquiring graphene-modified light rare earth-based intermetallic compounds with excellent hydrogen storage and electron storage properties is the aim of the project. The results are expected to promote the industrialization of rare earth-based energy storage materials and the comprehensive utilization of rare earth resources.