锂电池隔膜用耐高温网状互粘纳米纤维的可控制备及其锂离子输运机制研究

项目名称： 锂电池隔膜用耐高温网状互粘纳米纤维的可控制备及其锂离子输运机制研究

项目编号： No.51503079

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 翟云云

作者单位： 嘉兴学院

项目金额： 21万元

中文摘要： 研发具有热关闭功能、孔径小且分布均一的耐高温隔膜材料对提高锂离子电池的综合性能具有重要意义，本项目拟研究纺丝原液特性与加工参数对纳米纤维膜紧密堆积网状互粘结构成型的影响，确立紧密堆积网状互粘结构成型的边界条件，揭示纳米纤维隔膜紧密堆积网状互粘结构的调控规律。通过阐明纳米纤维隔膜与正、负极材料间的表/界面相互作用规律，探索充放电反应中多种物理过程和化学反应在纳米尺度下质能传递过程的协同耦合作用机制；进一步研究纳米纤维隔膜材料微观结构和表面理化特性对锂离子扩散、迁移、配位、解离的影响规律，深入探究锂离子在隔膜三维曲孔通道内的微纳输运机制。明晰隔膜材料本体结构特征与电池的安全性及电学性能间的构效关系，实现孔径<1μm且分布均一、孔隙率>80%、拉伸强度>10MPa、可耐180oC高温且具有热关闭功能的纳米纤维隔膜材料可控制备的目标，为新型高安全性纳米纤维隔膜材料的研发和应用奠定基础。

中文关键词： 静电纺丝；可控制备；三维曲孔通道；锂离子电池；隔膜

英文摘要： Research and development (R&D) of high thermal stable separators with shutdown characteristics, small pore size and uniform pore size distribution have attracted tremendous attention, which is of great significance to improve the overall performance of lithium ion batteries. Herein, this proposal studies the influence of solution characteristic and process parameters on the formation of close-packing net-like adhesion structured separators, establishing the boundary conditions and revealing the regulating rule of the formation of separators. And the synergistic coupling mechanism of the mass-energy transfer processes of variety of physical processes and chemical reactions at the nanoscale during the charge-discharge process will be explored by clarifying the interfacial interaction between the separators and electrode materials. Furthermore, the influence of the microstructure and surface physicochemical properties of separators on the diffusion, migration, coordination and dissociation of lithium ion will be investigated. And we will explore the transport mechanism of lithium ion in the three-dimensional tortuous tunnels of nanofibrous separators. Finally, we will clarify the bulk structure features of the separators with the best application performance, and achieve the target of controllable fabrication of nanofibrous separator with uniform pore size of less than 1 μm, high porosity (>80%), high tensile strength (>10 MPa), heat resistance up to 180oC and thermal shutdown characteristic. The proposal also lay a solid practical and theoretical basis for the design and R&D for other novel kinds of nanofibrous separators with high performance in the future.

英文关键词： Electrospinning;Controllable fabrication;Three-dimensional tortuous tunnels;Lithium ion batteries;Separators