The Impact of Mil-88a Metalorganic Framework on the Electrochemical Performance of LiMnPO₄

Lithium manganese phosphate (LiMnPO₄) is a cost-effective and environmentally friendly cathode material suitable for industrial-scale lithium-ion battery production. However, its electrochemical performance at high current rates is limited due to its poor ionic and electronic conductivity. This study focuses on developing and investigating MIL-88A-modified LiMnPO₄ (LMP) composite cathode materials. MIL-88A serves as both an ionic and electronic conductive material. The surface modification of LMP with MIL-88A was performed using an in situ hydrothermal technique. Various characterization methods, including XRD, TEM, XPS, and EDX, were used to analyze the microstructure, morphology, phase, and chemical composition of the synthesized materials. The MIL-88a coated LMP composites exhibited a uniform and stable spherical morphology. The optimal 7.5 wt% MIL-88A@LMP composite cathode material demonstrated significant improvements in high-rate performance, with discharge capacities of 160 mAh/g at 0.1C. These excellent results were mainly achieved by improving the rate of lithium-ion transport, decrease in polarization effects, and the decrease in interfacial impedance, which were caused by the influence of the MIL-88A coating.