Herein, we report on a core-shell structured cathode composite (Fig. ), where LiNi0.8Co0.15Al0.05O₂ (NCA) particles (core) are coated by a 100 nm thick pin-hole free LIC layer (shell), using a scalable mechanofusion process. Due to the LIC coating interfacial decomposition reactions of LPSCl, interfacial delamination, and particle cracking, as observed for uncoated NCA-based SSBs, are suppressed (Fig. and) facilitates a specific capacity enhancement of about 80 mAh/g for any C-rate and improved long-term cell cycling.