A buckled membrane sensor for in situ mechanical and microstructure analysis of li-ion battery electrodes

摘要

This work presents the first demonstration of a buckled membrane sensor for in situ, simultaneous characterization of stress and microstructure evolutions in a vanadium pentoxide (VO) lithium-ion battery (LIB) cathode during battery operation. The buckled membrane is coated with VO on the backside and enables atomic force microscopy (AFM) and Raman spectroscopy from the topside. Using dual-mode measurements, both the induced stress and Raman intensity changes due to lithium cycling are observed. Results are in good agreement with the expected mechanical behavior and disorder change in a VO electrode, highlighting the potential of MEMS as enabling tools for advanced scientific investigations.