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Synthesis of LiMn0.75Fe0.25PO4/C microspheres using a microwave-assisted process with a complexing agent for high-rate lithium ion batteries

LiMn0.75Fe0.25PO4/C microspheres were synthesized using a microwave-assisted process with a complexing agent. In this process, it was found that the various states of the complexing agent for different pH values of the precursor solution have significant effects on the obtained micro-spherical morphology. Furthermore, the concentration of antisite defects in the samples was also found to be affected by the pH of the precursor. The prepared secondary spheres have a high tap density of 1.3 g cm−3 and deliver a reversible capacity of 163 mA h g−1 at a 0.05 C-rate. Furthermore, remarkable rate capability is obtained, with 57% capacity retention at a 60 C-rate, as well as excellent cyclability, with 99.3% capacity retention after 100 cycles at 1 C-rate.