Electrolyte decomposition in Li-ion batteries (LIB) and its entailing gas evolution significantly impacts cell performance. CO 2 is one of the most abundantly evolved gases from common LIB electrolytes and could potentially affect Li + solution transport during LIB operation. To this end, a comparative analysis of the Li + diffusion coefficient (D Li + ) which governs mass transport is required. Herein a methodology is established to saturate common battery electrolytes with a soluble gas

more »

... t introducing other contaminants, so as to determine D Li + in saturated and unsaturated samples. As a proof of concept, the values of D Li + are determined in 1 M LiPF 6 and 1 M LiClO 4 in ethylene carbonate (EC):dimethyl carbonate (DMC) with and without dissolved CO 2 , confirmed by gas chromatography-mass spectrometry (GC-MS). The results obtained by pulse field gradient nuclear magnetic resonance (PFG-NMR) diffusion measurements agree for both electrolytes; saturating the electrolyte with CO 2 has no measurable effect on D Li + and therefore does not hinder Li + mass transport.