An Advanced Cell for Measuring In Situ Electronic Conductivity Evolutions in All-Solid-State Battery Composites

摘要

Ion and electron transport is of paramount importance for solid-statetechnology and its limitation presently prevents the access to liquid cellsperformance. Herein, this work tackles this issue by proposing an easilyimplementable cell design enabling to follow the cathode composite’selectronic conductivity evolution, in situ and during cycling. For proof ofconcept, distinct active material (AM) based composites are studied, namelyLiCoO_2 (LCO), LiNiO_2, LiNi_(0.9)Co_(0.1)O_2 (NC 9010), NMC 811, NMC 622, NMC111 (NMC family: LiNi_(1-y)Mn_yCoyO_2), and Li_4Ti_5O_(12) (LTO) mixed with Li_6PS_5Clsolid electrolyte (SE). This work shows the feasibility to track AM’s phasetransitions associated with changes in the material’s electronic transportproperties. Moreover, this work demonstrates the impact of the Ni content inthe various layered oxides, on the interparticle loss of contact at highstate-of-charge affecting electronic transport. Lastly, by tuning LTO particlesize and morphology, this work shows the effect of primary and secondaryparticle size on the specific metal–insulator transition pertaining to thismaterial. Altogether, this new testing cell opens-up a broad spectrum ofexperimental possibilities aiming to access in situ mode key metrics to benefitthe optimization of solid-state batteries research.