铁系纳米材料的结构稳定性对锂离子电池长循环性能的影响

项目名称： 铁系纳米材料的结构稳定性对锂离子电池长循环性能的影响

项目编号： No.51472014

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 周苇

作者单位： 北京航空航天大学

项目金额： 83万元

中文摘要： 就储能材料而言，更长的循环寿命意味着更少的资源消耗。而材料的结构稳定性是影响锂离子电池长循环性能的第一要素。本项目通过合成具有开放内外表面的碗状等非对称结构的纳米材料，构造复合电极材料实现高稳纳米结构或减少电极循环过程中纳米结构的损失，得到具有优异电化学性能的铁系纳米电极材料。通过对长循环过程中材料的成分、结构、界面等进行表征，揭示电池充放电过程对纳米结构损害的主要因素，指导材料的设计合成。结合电极材料的初步表征、电化学性能与循环完成后的二次表征结果，总结结构的稳定性与电池长循环性能间的内在联系，为优异性能纳米电极材料的结构设计提供理论依据。

中文关键词： 纳米结构；稳定性；锂离子电池；长循环

英文摘要： Much longer cycle life means lesser resource consumption for energy storage materials. And the durability of structures is the prior factor that influence the long-term cycles in lithium ion batteries (LIB). The project focuses on three routes to achieve highly stable nanostructure or reduce the destruction of nanostructures, i.e., synthesizing asymmetric nanostructures (bowl-like structure etc.) with open internal and external surfaces, combining iron group nanomaterials with carbon in various dimensions (carbon QDs, CNTs and reduced graphene oxide sheets), and fabricating direct electrode nanomaterials. Through the characterizations on components, structures, and interfaces of the active electrode materials during their long-term cycling processes, the main reason will be revealed for structure damages in the charge and discharge of LIB, which can be used to arrange designs of stable nanostructures. Based on analyzing the preliminary and the second characterizations after cycling on the electrode nanomaterials as well as the electrochemical properties, the interior relationship of the structure durability and long-term cycling life of the batteries will be summarized and provide theoretical supports for the design of electrode nanomaterials with excellent electrochemical properties.

英文关键词： nanostructure;durability;lithium ion battery;long-term cycles