Phys.org December 15, 2022
In the process of battery reaction, stress accumulation and lattice oxygen loss will cause some microcracks in lithium-rich manganese-based materials. The migration of transition metal ions will lead to phase transition of materials and other harmful side reactions. Researchers in China prepared high-performance cathode materials for lithium-rich manganese-based lithium-ion batteries. They did sulfur doping and in-situ growth of coherent spinel phase synchronously on the surface of lithium-rich manganese-based materials. The formation of TM-S bond configuration induced by S incorporation can effectively accelerated the lithium ions diffusion and suppressed 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…read more. TECHNICAL ARTICLE
The schematic illustration of the epitaxial spinel stabilizer and S-doping mechanism. Credit: Chemical Engineering Journal, Volume 454, Part 3, 15 February 2023, 140398Â