2D STRUCTURAL EVOLUTION OF POLYMER-BASED LI-ION BATTERIES BY OPERANDO SAXS/WAXS

Our aim is to follow the real-time spatially-resolved structural evolution of single-ion polymer electrolytes during lithium-ion battery cycling. The solid electrolyte is a 50 micron thick membrane with a multi-block architecture encoding nanoscale phase separation and showing, when plasticized with ethylene carbonate, excellent transport and electrochemical performances. We will perform operando SAXS to obtain the nanostructure evolution across the membrane thickness during battery charge/discharge, and operando WAXS in the same conditions to probe the evolutions of electrode-electrolyte interfaces.

本研究旨在追踪锂离子电池循环过程中单离子聚合物电解质的实时空间分辨结构演化。该固体电解质为厚度50微米的多嵌段结构膜，其具备纳米级相分离特性，经碳酸乙烯酯塑化后可展现优异的传输性能与电化学性能。本研究将采用原位小角X射线散射（operando SAXS）技术，获取电池充放电过程中沿膜厚度方向的纳米结构演化信息；同时在相同实验条件下采用原位广角X射线散射（operando WAXS）技术，探测电极-电解质界面的演化过程。