DC02 - Institut National Polytechnique de Grenoble - France
Title: Advanced characterization of interfacial reactivity and ionic charge transport in polymer electrolytes for LMP batteries
Objective:
Thorough analysis of ionic transport properties and interfacial reactivity in Single Ion Polymer Electrolytes (SIPEs) with the aim of producing physical models that consider structural, chemical and physical features. The use of advanced electrochemical methodology (EIS) and PFG-NMR will allow an effective characterization of transport properties of tailored SIPEs developed by DC1 (UCBL) and DC5 (LIST). Data gathered will be confronted to models developed by DC3 (UU). The chemical reactivity will be probed operando by ATR-FTIR using dedicated cells and correlated to the electrode potential measured by cyclic voltammetry. In addition, to further qualify the performances of SIPEs for LMP technology, DC2 will use standardized methodologies to study the morphological evolution of the Li/SIPE interface upon lithium plating (resp. stripping) by EIS, X-ray µtomography, and FTIR in collaboration with DC6 (NIC). DC2, in collaboration with DC1 (UCBL) and BS, will formulate composite electrodes using benchmarked high-V Co-less/free AMs (i.e. NMC811, LMNO or LMFP) to assemble and test the performance LMP batteries.
Expected results:
DC2 will produce reference data for ionic transport properties in all-solid and slightly plasticized SIPEs developed by DC1. The physical correlations between the key structural parameters (e.g. chemical nature of the building blocks, Li content, salt dissociation/solvation, chemical structure, and content of solvent plasticizer) and the ionic transport properties will be crucial to further improve the design of the SIPEs. The Li/SIPE interface is another hurdle, thus we expect DC2 to produce a fine description of the interfacial reactivity according to the SIPE composition thanks to EIS, operando X-ray µtomography, FTIR (with DC6 (NIC)), SEM-EDX and XPS (with DC3 (UU)). Finally, the best SIPEs will be used both as electrolyte and electrode binder in solid state LMP battery configuration. This methodology is expected to provide robust relationships that can guide the structural design of SIPEs with composition and architecture enabling the best compromise between interfacial reactivity and ionic charge transport.
SUPERVISORS
1130 Rue de la Piscine, 38610 Gières, France
