Synthesis And Electrochemical Performance Of Limnpo4/C With Fe Ion Dopant

A series of LiFexMn1-xPO4/C composite materials was synthesized using a solid-state reaction method, and Fe ion was doped into crystalline of LiMnPO4 for the improvement of electrochemical performance. The phenolic resin was added as the reducing agent and carbon sources. The effect of Fe-to-Mn ratio, calcination temperature and calcination time on the electrochemical performance was investigated. Results reveal that LiFexMn1-xPO4/C has an order olivine structure and high purity. Samples have the similarly spherical morphology with particle size of 300 similar to 500 nm and uniform distribution. The outcomes of charge-discharge measurement show that the capacity at the voltage plateaus due to the Fe2+/Fe3+ and Mn3+/Mn2+ redox groups increases and decreases, respectively, with Fe content increasing, and the LiFe0.5Mn0.5PO4/C sample calcined at 600 degrees C for 10 h exhibits higher capacity and better rate-cycling performance, including the first discharge capacity 147.3 mAh/g at 0.1 C, the discharge capacity of 115.2 mAh/g decreasing to 112.7 mAh/g at 2C as well as the capacity retention rate 97.8% after 100 cycles and the capacity retention rate 89.6% after 200 cycles at 10 C.