AlPO₄-Modified 5.2 V LiCoMnO₄ Cathode With Enhanced Electrochemical Performance

A high-voltage Li-rich LiCoMnO₄ (LCMO) cathode is successfully prepared using the co-precipitation technique and then tuned with varying concentrations of AlPO₄ coating (1, 3, 5, and 10 wt.%). Among these, the LCMO@AlPO₄_3 wt.% shows excellent electrochemical performance with a specific capacity of 103 mAh g^-1 and 71% capacity retention. This is significantly better than the pristine sample, which has a specific capacity of 91 mAh g^-1 and 60% capacity retention after 100 cycles. Additionally, the Li-diffusion coefficient is computed using electrochemical impedance spectroscopy, and the optimized coated sample exhibited a higher diffusion value. To realize the practical feasibility of such an AlPO₄-modified cathode, the full-cell is fabricated using an Li₄Ti₅O₁₂ anode under balanced loading conditions. At ambient temperature conditions, the full cell offered an energy density of 227 Wh kg^-1. To produce high-energy next-generation cathodes for lithium-ion batteries, this research offers the concept of surface modification with inexpensive Li-rich materials.