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Synthesis and electrochemical performance of magnesium ion doped lithium iron phosphate

Gu Heyun;Li Sheng;Li Errui;Wang Kai;Xu Jiangsheng;School of Chemistry and Chemical Engineering,Hefei University of Technology;  
A hydrothermal reaction has been adopted to synthesize Li Fe PO4 precursor firstly.Then it was modified with carbon coating and magnesium ion(Mg2+) doping through a post-heat treatment.The chemical composition,morphology,and structure of the material were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),and transmission electron microscopy(TEM).Energy dispersive spectroscopy mappings have verified the homogeneous existence of doped Mg2+in Li Fe PO4 particles.The electrochemical performances of the as-prepared material were studied by galvanostatic charging/discharging measurements,cyclic voltammetry(CV),and electrochemical impedance spectroscopy(EIS).The test results showed that Mg2 +doped lithium iron phosphate exhibited high special capacity(160.1 m A·h/g at 0.1C),superior rate capability(77.2 m A·h/g at 20C),and could reduce the polarization and decrease charge transfer resistance.This synthesis route is promising in making the hydrothermal method more practical for preparation of the Li Fe PO4 material and enhancement of electrochemical performance.
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