Transport properties of lithium salts in carbon confined glymes in relation to lithium-air batteries

EDUARDO FUENTES-QUEZADA; IVETTE ANGARITA; MATÍAS FACTOROVICH; MALDONADO OCHOA, SANTIAGO A.; CHÁVEZ, FABIÁN VACA; ACOSTA, RODOLFO H.; EZEQUIEL DE LA LLAVE; LONGINOTTI, M. PAULA; HORACIO CORTI

Congreso; HYCELTEC 2022; 2022

In this work, we studied the effect of confinement andsurface charge in the transport properties of LiTf and LiTFSIsalts in diglyme solutions. We showed that carbon micro/mesoporous structure plays a critical role on thetransport properties of the electrolyte, producing a decrease up to 3 orders of magnitude on the salt diffusioncoefficient when it goes from bulk to a pore with a diameter of 1 nm. It was observed that for pores with 10 and 25nm diameters the reduction in the diffusion coefficient canbe ascribed to the porosity of the sample, being the tortuosity approximately close to one. However, for smallerpore sizes (1-4 nm diameter) bigger tortuosity values canbe related to high ion-pore wall interaction