Operando swelling measurement of Si-C/G based anode in pouch cell
Résumé
Silicon lithiation induces a high material expansion which leads to significant swelling and mechanical pressure at the anode and cell level. The operando swelling behaviour of bi-layer pouch cell with high performance silicon carbon graphite (Si-C/G) anode material will be presented using an in-house high precision (< 0.1µm) compression set-up with simultaneous pressure and thickness recording as well as dynamic pressure regulation system [1]. Results will be presented for various cell designs in terms of electrode balancing, anode porosity or external pressure level. Combining this set-up and a 1D modelling of active material (graphite, silicon, NMC622) swelling in function of the SOC [2] it is possible to provide insights in porosity changes of anode.
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