The SE cathode slurry, that is composed of 75 % LiNi 9 Mn 0.5 Co 0.5 O 2 (NMC), 17.5 %LPSCl, 5 % Timcal C65 and 2.5 % Polyisobutene (PIB), is prepared in order to characterize its density. Each material constituent was dried under vacuum at 120 °C and then stored in a glovebox before use. To prepare the slurry, first NMC was hand-mixed alone in a mortar for 5 minutes, then the Timcal C65 was added to the mortar and ground by hand for 10 minutes. Subsequently, the SE LPSCl was added and all powders were ground together for another 10 minutes. The solution of 9 % polyisobutylene (PIB) in p-xylene was added into a vial with the magnet stirrer. Afterwards, the resulting powder was added and mixed with 2 g p-xylene to reach a solid content of 50 %. Finally, the slurry density was measured in an Anton Paar densimeter with the reference DMA 4100 M, right after being prepared.