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

为了获得具有异质界面的复合材料所需的结构，在不同的条件下进行了纳米粒子的三维组装。通过溶胶-凝胶工艺（Stober方法）制备核颗粒，并且用固态电解质层对核颗粒的表面进行改性。通过改变填充率测量了复合材料的离子电导率，填充率与异质界面的导电路径有关。它随复合材料填充率的增加而增加，并受电解质层结构的影响。在外加电场作用下，有机液体中的溶胶态粒子排列有序，以控制其堆积率。有序性由组装粒子的分布函数估计。结果表明，电场强度、有机液体种类和组装时间是影响粒子阵列有序性的主要因素，并对复合材料的界面效应进行了分子动力学（MD）模拟。复合材料的界面结构部分呈现无序状态。无序结构附近的离子扩散非常大。这表明界面结构的设计使我们能够制备快速离子传导材料。

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.