Qingdao Institute of Bioenergy and Bioprocess Technology , Chinese Academy of Sciences , Qingdao 266101 , China.
ACS Appl Mater Interfaces. 2018 May 9;10(18):15691-15696. doi: 10.1021/acsami.8b01631. Epub 2018 Apr 24.
It is of great significance to seek high-performance solid electrolytes via a facile chemistry and simple process for meeting the requirements of solid batteries. Previous reports revealed that ion conducting pathways within ceramic-polymer composite electrolytes mainly occur at ceramic particles and the ceramic-polymer interface. Herein, one facile strategy toward ceramic particles' alignment and assembly induced by an external alternating-current (AC) electric field is presented. It was manifested by an in situ optical microscope that LiAlTi(PO) particles and poly(ethylene glycol) diacrylate in poly(dimethylsiloxane) (LATP@PEGDA@PDMS) assembled into three-dimensional connected networks on applying an external AC electric field. Scanning electron microscopy revealed that the ceramic LATP particles aligned into a necklacelike assembly. Electrochemical impedance spectroscopy confirmed that the ionic conductivity of this necklacelike alignment was significantly enhanced compared to that of the random one. It was demonstrated that this facile strategy of applying an AC electric field can be a very effective approach for architecting three-dimensional lithium-ion conductive networks within solid composite electrolyte.
通过简单的化学和简单的工艺寻求高性能的固体电解质对于满足固体电池的要求具有重要意义。先前的报告表明，陶瓷-聚合物复合电解质中的离子传导途径主要发生在陶瓷颗粒和陶瓷-聚合物界面处。在此，提出了一种通过外部交流（AC）电场诱导陶瓷颗粒排列和组装的简便策略。通过原位光学显微镜表明，在施加外部交流电场时，LiAlTi(PO)颗粒和聚（乙二醇）二丙烯酸酯在聚（二甲基硅氧烷）中组装成三维连通网络。扫描电子显微镜显示，陶瓷 LATP 颗粒排列成项链状组装。电化学阻抗谱证实，这种项链状排列的离子电导率明显高于随机排列的离子电导率。结果表明，施加交流电场的这种简便策略可以非常有效地构建固体复合电解质中的三维锂离子导电网络。
