High-voltage stability of sulfide-based all-solid-state batteries: benefit of the parasitic reaction

Abstract

Severe interfacial degradation occurs in sulfide-based all-solid-state batteries (ASSBs) at high voltages, due to the parasitic reaction between the solid electrolyte (SE) and Ni-rich layered oxide. Herein, we show that a conformal nanoscale coating of Li6PS5Cl (LPSCl) on LiNi0.8Co0.1Mn0.1O2 (NCM) promotes the homogeneous parasitic reaction and improves the high-voltage stability, enabling durable cell operation, even after extended storage at 4.25 V vs. Li/Li+.