高性能富锂锰基层状正极材料的设计、构筑及电化学机理分析

The project faces to the great demand of new clean energy and new energy vehicles strategy for the state. The major target of the project is to develop the preparation strategy of nano-energy materials, design and synthesize the Lithium-excess manganese layered oxides with stable structures and high energy density and explore the controlled growth and formation mechanism of the functioned nano-composites and nano-assemblies. In addition to revealing the structure-activity relationship and evolution rule between nanostructured electrode materials and lithium storage properties and carrying out material hybridization, surface modification and large-scale preparation technology for electrode materials, the project team also explore the method and its realization for greatly improving the energy density and cycle life of lithium ion batteries.

本项目面向国家对新型清洁能源和新能源汽车战略的重大需求，设计合成结构稳定且具有高能量密度的富锂锰基层状正极材料，探索功能化纳米结构与纳米组装体的可控生长与形成机制，揭示电极材料纳米结构与储锂性能的构效关系与演变规律，开展材料杂化、表面修饰及规模化电极材料制备技术，探索大幅度提高锂离子电池能量密度和循环使用寿命的方法及其实现途径。

本课题技术攻关富锂锰基层状正极材料和硅碳负极材料规模制备关键技术，辅以软包电池设计和开发，实现了单体锂离子电池能量密度≥280Wh/kg，在国际学术期刊发表SCI论文3篇，培养硕士研究生2人，博士研究生2人，实现了预期目标。项目从电池材料和电芯设计两个角度切入，为优化电极材料和单体电池设计与合成工艺提供指导，探索实现高能量密度锂电池的途径，提出了高能量密度电芯设计的具体思路，以促进新能源汽车市场化推广和产业化进程。