PROCESS STUDY FOR THE PRODUCTION OF SOLID STATE ELECTROLYTE COMPOSITES BY USING NANO-PARTICLE ASSEMBLY

纳米颗粒的三维组装是在各种条件下进行的，以获得所需的具有异质界面结构的复合材料。采用溶胶凝胶法(Stober法)制备了核心层，并在核心层表面修饰了固体电解质层。通过改变填充分数与异质界面导电路径的关系，测量了复合材料在由这些颗粒制成的圆盘中的离子电导率。它随复合材料填充分数的增加而增大，并受电解层结构的影响。将有机液体中的溶胶态粒子在外加电场中排列，以控制堆积分数。有序性通过组装粒子的分布函数来估计。发现颗粒阵列的有序参数是电场强度、有机液体种类和组装时间，并用分子动力学(MD)模拟评价了复合材料的界面效应。复合材料的界面结构部分表现为无序。无序结构附近的离子扩散很大。这表明，界面结构的设计使我们能够制备出快速离子导电材料。

Nano-particle assembly in three dimensions has been performed under various conditions for obtaining composite materials required structures with hetero-interfaces. Core particles were fabricated by a sol-gel process (Stober method), and surface of the core particles were modified with a solid state electrolyte layers. Ionic conductivity of composites in a disk made of the particles was measured with changing packing fraction which related to conduction path of the hetero-interface. It increased with increasing packing fraction of the composite and was affected by the structures of the electrolyte layer. The particles of sol state in an organic liquid were arrayed in applied electric field for controlling the packing fraction. Ordering is estimated by distribution functions of the assembled particles. It was found that order parameters of particles array were the field strength, kind of organic liquids and assembling time.Molecular dynamics (MD) simulations have been carried out for evaluation of interfacial effects of the composites. The interfacial structure of the composite partially showed in disordered. Ionic diffusion near disordered structure is very large. It indicates that design of the interfacial structure enables us to product fast ion conduction materials.