Phosphorus-doped lithium- and manganese-rich layered oxide cathode material for fast charging lithium-ion batteries

Owing to their high theoretical specific capacity and low cost, lithium- manganese-rich layered oxide (LMR) cathode materials are receiving increasing attention for application in lithium-ion batteries. However, poor lithium ion electron transport kinetics plus side effects of anion cation redox reactions hamper power performance stability the LMRs. In this study, LMR Li1.2Mn0.6Ni0.2O2 was modified by phosphorus (P)-doping increase Li+ conductivity bulk material. This achieved interlayer spacing layer, structural stability, resulting improvement rate safety performance. P5+ doping increased distance between (003) crystal planes from ~0.474 nm 0.488 enhanced forming strong covalent bonds with oxygen atoms, an improved (capacity retention 38% 50% at 0.05 C 5 C) thermal (50% heat release compared pristine material). First-principles calculations showed P-doping makes transfer excited electrons valence band conduction easier P can form a bond helping stabilize material structure. Furthermore, solid-state electrolyte doped cycle up 200 cycles 90.5% initial coulombic efficiency 68.5% (pristine) or 81.7% (P-doped LMR) 88.7%.