Unlocking The Potential of Li-rich Mn-based Oxides for High-rate Rechargeable Lithium-ion Batteries.

Lithium-rich Mn-based oxides have gained significant attention worldwide as potential cathode materials for the next generation of high-energy density lithium-ion batteries due to their discharge capacities exceeding 250 mAh g -1 . Nonetheless, the inferior rate capability and voltage decay issues present formidable challenges. Conventional approaches to improving rate performance, like nano- and porous structural design, increase surface area of cathode and consequently accelerate harmful Mn-ion migration and oxygen loss. Here, we initially synthesize a Li-rich material equipped with quasi-three-dimensional Li-ion diffusion channels by introducing twin structures with high Li-ion diffusion coefficients into the crystal and constructing a "bridge" between different Li-ion diffusion tunnels. The as-prepared material exhibits monodispersed micron-sized primary particles, delivering a specific capacity of 303 mAh g -1 at 0.1C and an impressive capacity of 253 mAh g -1 at 1C. More importantly, the twin structure also serves as a "breakwater" to inhibit the migration of Mn ions and improve the overall structural stability, leading to long-term cycling stability with 85% capacity retention at 1C after 200 cycles. Our proposed strategy of constructing quasi-three-dimensional channels in the layered Li-rich cathodes will open up new avenues for the research and development of other layered oxide cathodes, with potential applications in industry. This article is protected by copyright. All rights reserved.