In-situ, real-time monitoring of mechanical and chemical structure changes in a V 2 O 5 battery electrode using a mems optical sensor

Abstract

This work presents the first demonstration of a MEMS optical sensor for in-situ, real-time monitoring of both mechanical and chemical structure evolutions in a V 2 O 5 lithium-ion battery (LIB) cathode during battery operation. A reflective membrane forms one side of a Fabry-Perot (FP) interferometer, while the other side is coated with V 2 O 5 and exposed to electrolyte in a half-cell LIB. Using one microscope and two laser sources, both the induced membrane deflection and the corresponding Raman intensity changes are observed during lithium cycling. Results are in good agreement with the expected mechanical behavior and disorder change of the V 2 O 5 layers, highlighting the significant potential of MEMS as enabling tools for advanced scientific investigations.