富勒烯构建动力锂离子电池复合SEI膜及其性能研究

项目名称： 富勒烯构建动力锂离子电池复合SEI膜及其性能研究

项目编号： No.21203056

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理化学

项目作者： 李苞

作者单位： 河南师范大学

项目金额： 26万元

中文摘要： 固体电解质界面膜(SEI膜)对锂电池的性能有着至关重要的影响，对其深入的研究也是解决动力锂电池所面临诸多难题的有效途径之一。目前SEI膜的研究主要集中在材料表面的改性和寻找更好的锂盐、溶剂、添加剂等领域。富勒烯分子具有独特的几何、电子结构，用它包覆的电极材料表现出优异的电化学性能，因此本课题拟以富勒烯聚合物为骨架构建复合的SEI膜，并系统的研究其组成、结构与性能之间的关系：采用热聚合、电化学聚合等方式在碳基、硅基两类负极材料表面聚合一层富勒烯聚合物膜或富勒烯/高分子的共聚膜，借助红外、拉曼、核磁、阻抗等手段检测聚合膜和复合SEI膜的组成和结构，借助DSC、TGA、AFM等设备研究其热稳定性和机械性能，找出富勒烯聚合膜、复合SEI膜对电池安全、循环、存储等性能的影响，探索复合SEI膜对电极界面电化学行为的影响以及锂离子的传输机制，丰富锂电池界面研究理论，为复合SEI膜的应用提供理论支持。

中文关键词： 表面修饰；SEI膜；富勒烯；富锂锰氧化物；LiFePO4

英文摘要： Currently, the main obstacles for commercialization of power Li-ion batteries come from safety, capacity, cyclic life et al. Solid electrolyte interface (SEI) takes a critical influence on the performance of Li-ion batteries, and also acts as the key point to solve above-mentioned problems. The systemic study on SEI film is one of the effective ways to solve the embarrassment faced by power lithium battery. For example, the first reaction is the decomposition of SEI film at the beginning of the thermal runaway of batteries. To obtain a high-performance SEI film now are focused on the fields of surface modification to anode materials or selecting more suitable lithium salts, solvents, additives et al. Fullerenes show a unique geometry and electronic structure, and have been used in many commercialized products such as cosmetic, cues of golf. Fullerene-coated Silicon anodes exhibit an excellent electrochemical performance, especially the cyclic property. Thus this project propose to build a composite SEI film with a polymerized fullerene film as its backbone, and then systematically study the relationship between the component, structure of SEI film and the performances of battery. Thermo-induced or electro-induced polymerizing a layer of fullerene film or fullerene/polymer film was coated on the surface of anode

英文关键词： surface modification；SEI；fullerene；Li-rich manganese oxides；LiFePO4