The report about ‘Electrodes and electrolyte processing development’ collects the optimization of formulations and processes towards the development and fabrication of high loading (ca. 3.0 mAh/cm2) composite electrodes, lithium metal foil and thin solid electrolyte for “Li|SE|NMC811” solid state cells. To do this, three levels of materials (L1, L2 and L3) were developed to be used in three consecutive generations GEN0, GEN1 and GEN2 of solid-state cells. The developed and upscaled cell components have been validated and tested in coin, single-layer and multi-layer solid state pouch cells with nominal capacity up to 1 Ah.
The main objective of the reported activity was the optimization of formulations and processes towards the fabrication of three levels (L1, L2 and L3) of: (i) positive electrodes formulations “NMC811|Carbon additive|Catholyte“, with a loading up to 3.0 mAh/cm2, (ii) ultrathin lithium metal negative electrodes with thickness of 40-50 µm, and (iii) solid composite electrolytes based on polymers and Li ion conductive ceramic materials. As a result, developed cell components have been tested in three different generations (GEN0, GEN1 and GEN2) of solid-state cells using such formats as: coin, single-layer pouch and multilayer 1 Ah pouch.
1st batch of GEN0 (L1) coin and single layer solid state pouch cells were manufactured for further testing and interface characterization. The obtained feedback was then used to improve the next generation (L2) solid electrolyte and active materials, optimize cell design and tailor the cell manufacturing procedure. Consequently, GEN1 (L2) coin, single layer pouch and 1 Ah multi-layer pouch cells testing evaluation was used to improve the next generation materials (L3). Picture below shows the cells components and two different solid state cell types used in the SAFELIMOVE project.
Figure: Solid-state cell components and two cell formats: coin and pouch.