Operando swelling measurement of Si-C/G based anode in pouch cell
Abstract
Silicon lithiation induces a high material expansion leading to significant swelling and mechanical
pressure at the anode and cell levels. The operando swelling behavior of bi-layer pouch cell with high
performance silicon carbon graphite (Si-C/G) anode material measured using an in-house high precision
(< 0.1µm) compression set-up with simultaneous pressure and thickness recordings as well as dynamic
pressure regulation system [1] are presented. Results are compared for various cell designs in terms of
electrode balancing, anode porosity or external pressure level [2]. Combining this set-up and advanced
modelling, it is possible to provide physical parameters at the origin of the breathing behavior.