Preparation and Electrochemical Performances of Magnesium and Zircon Doped Lithium Iron Phosphates

Abstract

Magnesium and zircon doped lithium iron phosphates(LiFePO4) were synthesized via combustion method without inert gas, then they were characterized by X-ray diffraction and Scanning electron microscopy, and their electrochemical performances including discharge performance and cycle performance were measured by galvanostatic charge-discharge cycling technique. The results indicate that both doped LiFePO4 still keep the structure of olivine but their electrochemical performances greatly improve compared with the undoped LiFePO4. In addition, zircon doped LiFePO4 exhibits the best discharge specific capacity of 143.4 mAh/g at 0.2 C discharge rate and the discharge specific capacity of it remains 126.3 mAh/g after 50 charge/discharge cycles, showing good cycle performance.