【摘要】 聚偏氟乙烯（PVDF）及其共聚物因其高介电常数、优异的机械与电化学稳定性及宽电化学窗口，在准固态钠离子电池聚合物电解质领域展现出重要的应用前景。然而，其室温离子电导率偏低及电极/电解质界面不稳定问题，制约了其在高安全性、长寿命储能体系中的实际应用。本文系统梳理了PVDF的共聚特性、多晶型结构及分子构象，重点分析液体环境调控、功能性填料引入及正负极界面改性提升电化学性能的三大策略。在液体环境方面，分析溶剂优选、残留溶剂比例调控及多功能添加剂协同对稳定固体电解质界面（SEI）构建的影响；在填料方面，对比活性填料与惰性填料的作用机制及表面改性技术对分散性的提升效果；在界面改性方面，阐述PVDF在负极侧生成富无机SEI及在正极侧作为柔性缓冲层的双重角色。指出通过构建“机械增强-离子传导-界面调控”多功能网络实现全链条优化的技术路径。通过对改性策略的系统比较与性能提升路径的深入探讨，为高稳定性、高能量密度PVDF基准固态钠离子电池的开发提供了系统参考与思路支持。更多还原

【Abstract】 Polyvinylidene fluoride(PVDF)and its copolymers have shown important application prospects in the field of polymer electrolytes for quasi-solid-state sodium ion batteries due to their high dielectric constant,excellent mechanical and electrochemical stability and wide electrochemical window. However,its low ionic conductivity at room temperature and unstable electrodes-electrolyte interface restrict its practical application in high-security and long-life energy storage systems. In this review,the copolymerization characteristics,the polymorphic structures,and molecular conformation of PVDF are systematically reviewed. Three main strategies for improving the electrochemical performance of PVDF,including liquid environment regulation,introduction of functional fillers and interface modification of positive and negative electrodes,are emphatically analyzed. In the aspect of liquid environment,the effects of solvent optimization,residual solvent ratio regulation and multi-functional additive synergy on the construction of stable solid electrolyte interphase(SEI)are analyzed. In terms of fillers,the mechanism of interaction with the PVDF of active fillers and inert fillers and the improvement effect of surface modification technology on dispersion are compared. In terms of interface modification,the dual roles of PVDF in forming inorganic-rich SEI on the negative side and acting as a flexible buffer layer on the positive side are described. The technical path of realizing the whole chain optimization by constructing a multi-functional network of “mechanical enhancement-ion conduction-interface regulation” is pointed out. Through the systematic comparison of modification strategies and the in-depth discussion of performance improvement paths,it provides a system reference and idea support for the development of high stability and high energy density PVDF based quasi-solid-state sodium ion batteries.更多还原