Sulfuretted Li- and Mn-rich cathode material with epitaxial spinel stabilizer for ultra-long cycle Li-ion battery

• Sulfuretted Li- and Mn-Rich cathode material with epitaxial spinel stabilizer is successfully constructed; • The introduced spinel phase stabilizer was lattice-compatible with Li- and Mn-Rich; • S incorporation can effectively accelerate the lithium ions diffusion and suppress the undesired oxygen redox; • The electrochemical performance was greatly improved by epitaxial spinel and S doping. The utilization of Li- and Mn-rich layered cathode materials is an effective route to break the energy density bottleneck of lithium-ion batteries for practical applications. However, these materials always suffer from severe structural degradation and oxygen loss during long-term cycling process. Herein, the integrated modification was realized by epitaxial spinel phase film grown on the surface of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LMR) and proper S elements doping to obtain outstanding electrochemical performance. The introduced spinel phase stabilizer can enhance Li ion conductivity and reduce the particle cracks and phase collapse during repeated cycling processes. The formation of TM-S bond configuration induced by S incorporation can effectively accelerate the lithium ions diffusion and suppress the undesired oxygen redox. Therefore, the LMRS@S cathode displays an excellent electrochemical performance: ultra-long-cycling stability with capacity retention of 82.1% after 600 cycles at 1 C, higher initial Coulomb efficiency (84.7% vs. 76.3%) and excellent full cell performance (81.7% capacity retention after 140 cycles). The synergistic strategies with surface stabilizer and S- incorporation affords a promising way to design superior cycling performance LMR cathode material.