柔性Sn/TiC/C纳米纤维膜锂离子电池负极材料的复合结构设计及电化学性能协同增效机制

项目名称： 柔性Sn/TiC/C纳米纤维膜锂离子电池负极材料的复合结构设计及电化学性能协同增效机制

项目编号： No.51272021

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 于运花

作者单位： 北京化工大学

项目金额： 80万元

中文摘要： 针对新型全固态薄膜锂离子电池对负极材料在高能、循环稳定和超柔性方面的使用要求，本项目以设计Sn/TiC/C复合纳米纤维膜的"芯壳"和"夹层"形式的柔性复合结构，实现柔性与电化学性能的协同增效为目标，利用同轴和单喷头组合的静电纺丝技术，结合预氧化和碳热还原反应，围绕Sn/TiC/C纳米纤维膜柔性结构构建过程中组成和结构的转变机制，以及柔性结构-电化学性能之间的协同增效机制这两个关键的科学问题，通过调控材料制备过程参数、异质组成转变、组成比例和异质间界面等因素构建Sn/TiC/C纳米纤维膜的不同柔性结构，研究不同柔性结构材料的电化学性能，并结合理论预测模型，阐明材料的制备过程参数与组成、柔性结构和电化学性能之间的关联性，实现Sn/TiC/C纳米纤维膜电极材料的柔性复合结构与电化学性能的最佳协同控制，制备出一种柔性、高容量和循环稳定的新型锂离子电池薄膜负极材料。

中文关键词： 碳纳米纤维；锡氧化物；静电纺丝；元素掺杂；电化学性能

英文摘要： In order to meet the requirements of high energy,cycle stability and super flexibility for anode materials of new generation all-solid-state thin film lithium-ion batteries, the project aims to realize the synergetic electrochemical property and flexibility through designing core-shell and sandwich composite structures of flexible Sn/TiC/C nanofiber films as anode matreials for lithium-ion batteries (LIBs)， which will be fabricated using coaxial and composite single-nozzle electrospinning techniques combined with preoxidization and carbonthermal reduction processes. Around two key scientific questions, i.e., composition and structure changing mechanism during forming flexible composite structures, and synergetic electrochemical mechanism with flexible structures, the flexible composite structures would be formed by cotrolling fabrication factors, heterogenous composition change,ratio and interface. By comparing the electrochemical properties of Sn/TiC/C anode materials with different flexible structure along with the theoretical predition based on density functional theory, the relation between composition, flexible structure and electrochemical properties would be founded. Moreover, based on the relation, the optimized synergetic electrochemical properties of flexible Sn/TiC/C composite anode materials woul

英文关键词： carbon nanofibers；tin oxides；electrospinning；element doping；electrochemical performance