Synthesis and performances of a Fe-site doped lithium iron phosphate

摘要

A Fe-site doped lithium phosphate LiFe_(0.99)La_(0.01)PO_4 as cathode material for lithium ion battery was synthesized by solid-state reaction. The crystalline structure, morphology of particles and electrochemical performances of the sample were investigated by X-ray diffraction, scanning electron microscopy, charge-discharge test and cyclic voltammetry. The results show that the small LiFe_(0.99)La_(0.01)PO_4 particles are simple pure olive-type phase structure with uniformly distribution of gain size. The LiFe_(0.99)La_(0.01)PO_4 obtained has proper electrochemical capacity, good cycle ability and rate performances. Such an excellent electrochemical characteristic should be partially related to the enhanced electronic conductivities and probably the better mobility of Li ion in the crystal of the doped sample.