Facilitate stable oxygen redox of lithium-rich layered oxide cathode in halide all-solid-state lithium-ion batteries

Lithium-rich layered oxide (LLO) cathode materials with high reversible capacity contributed by both cation and anion redox can significantly improve the energy density of all-solid-state lithium-ion batteries (ASSLIBs). However, LLO exhibit an extremely low electronic conductivity. Meanwhile, the oxidation of lattice oxygen and the related interface reaction led to irreversible lattice oxygen loss, limiting the electrochemical activity and cycle performance. Here, we used Li 2 RuO 3 as the LLO cathode material and Li 3 InCl 6 as the solid electrolyte to study the oxygen redox and the related interface reaction in ASSLIBs at 25 and 45°C. The interaction between indium in the Li 3 InCl 6 and the oxidized O 2- constructs a lattice oxygen stabilizing interface, reducing irreversible lattice oxygen loss. Furthermore, high working temperature activates the redox of oxygen, enabling the ASSLIBs to achieve an initial discharge capacity of 276 mAh g -1 with a coulombic efficiency of 90% and a capacity retention of 72% after 200 cycles.