Unraveling the interfacial compatibility of ultrahigh nickel cathodes and chloride solid electrolyte for stable all-solid-state lithium batteries

Highly active lattice oxygen released from ultrahigh nickel cathodes degrade chloride solid electrolytes, forming an inert interphase; this phenomenon worsens at higher voltages. Reducing the cut-off voltage markedly enhances ASSLBs’ operational lifespan.