Advanced Nanoparticle Coatings for Stabilizing Layered Ni‐Rich Oxide Cathodes in Solid‐State Batteries

Improving the interfacial stability between cathode active material (CAM) and solid electrolyte (SE) is a vital step toward development of high-performance solid-state batteries (SSBs). One challenges plaguing this field an economical scalable approach to fabricate high-quality protective coatings on CAM particles. A new wet-coating strategy based preformed nanoparticles presented herein. Nonagglomerated coating (≤5 nm, exemplified for ZrO2) are prepared by solvothermal synthesis, after surface functionalization, applied layered Ni-rich oxide CAM, LiNi0.85Co0.10Mn0.05O2 (NCM85), producing uniform layer with unique structure. Remarkably, when used in pelletized SSBs argyrodite Li6PS5Cl as SE, coated NCM85 found exhibit superior lithium-storage properties (qdis ≈ 204 mAh gNCM85−1 at 0.1 C rate 45 °C) good capability. The key observed improvement lies homogeneity coating, suppressing side reactions while simultaneously limiting gas evolution during operation. Moreover, proven have similar effect liquid electrolyte-based Li-ion can potentially be application other, even more favorable, nanoparticle coatings.