Sandwich-Structured Po43--Doped Layer @ Spinel @ Rgo Lithium-Rich Manganese-Based Cathode Material Enhanced Rate Capability and Cycle Stability for Li-Ion Batteries

The Li-rich Mn-based cathode (LRM) material faces challenges like low initial coulombic efficiency (ICE) and reduced capacity retaining, which restrict their commercial viability in high energy density lithium-ion batteries (LIBs). All of these are primarily generated by irreversible migration of transition metal ions (TMn+) and lattice oxygen escape. Herein, a novel approach for enhancing Li-rich cathodes is presented by implementing the PO43- doped layer @ spinel @ rGO sandwich-structure to address the aforementioned challenges. Due to the synergistic impact of PO43- doping and rGO surface modification, the modified samples exhibited remarkable electrochemical properties, including an impressive initial coulomb efficiency (ICE) of 87.54%, a superior capacity of 188.1 and 155.2 mAhg-1 respectively at 25 ℃ and 45 ℃ following 100 cycles at 1 C, an outstanding rate capability of 82.3 mAhg-1 at 10 C, a restrained voltage decrease of 0.481 V after 100 cycles. The synergetic strategy in this work could serve as a source of inspiration for exploring high energy density and long cycle cathode materials.