Synthesis And Properties Of Olive-type Phosphate Cathode Materials

The olivine LiMPO₄?M=Fe,Mn,Co and Ni?phosphates have been widely investigated as potential cathodes for lithium-ion batteries due to their large theoretical capacities,excellent cycle life and fewer safety issues.The LiFePO₄-P and LiFePO₄-C cathode nanomaterials were prepared by solvothermal method.Among them,the unit-cell Volume of LiFePO₄-P is smaller.The internal structure of LiFePO₄-P material is more stable.The LiMnPO₄ nanoparticles are synthesized using water and ethylene glycol solution,respectively.Ethylene glycol acts as a reducing agent and controls the particle size of the sample.LiMnPO₄/C nanocomposites were prepared by spray-drying method.LiMnPO₄ with carbon could greatly improve the cycling stability of the materials.The LiFe_1-xMnxPO₄ material prepared by spray drying had better electrochemical performance,smaller charge transport Li₃V₂PO₄ cathode material was prepared by three different methods,and the electrochemical performance of lithium vanadium phosphate synthesized by sol-gel method was the best.The products were tested by XRD,SEM,EDS and EIS.