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.