We have a new paper out today on polymer-based all-solid-state batteries, focused on the catholyte. We find that when using PVDF, 10% catholyte is a starved condition. But if you replace a little bit of the PVDF with PEO it helps the interface a lot.

We also find that loading up on catholyte has ~some benefits, but also causes the catholyte to agglomerate and hinder transport.

A new paper led by Alyssa Stavola is out today. We study NMC cathodes with an argyrodite sulfide electrolyte. We find *kinetics* are ~13% of the same NMC with a liquid electrolyte, which we attribute to inactive NMC surface area.

We also use micro-XANES and XRF (shown above) to detect reduced Co²⁺ at the surface of the NMC. The bulk NMC is Co³⁺. This indicates CoS or Co₃S₄ at the interface.