Synthesis and Electrochemical Properties of LiFe0.95Ti0.05Po4/(C+LiFeP2O7) Composite Material
A new LiFePO4-based phase composite LiFe0.95Ti0.05PO4/(C+LiFeP2O7)was synthesized by solid state method . The amorphous carbon and phosphate LiFeP2O7 consisted of the protective layer and coated the surface of the solid solution LiFe0.95Ti0.05PO4 The phosphate LiFeP2O7 was detected though XRD(X-ray diffraction)and CV(cyclic voltammetry).Morphology of the composite was observed by scanning electron microscope(SEM)and Transmission electron microscopy (TEM), it illustrated Ti4+ had been induced into the crystal lattice of LiFePO4 and formed the solid solution LiFe0.95Ti0.05PO4.The data of charge-discharge tests showed the composite had excellent electrochemical properties. Initial charge and discharge capacity of LiFe0.95Ti0.05PO4/(C+LiFeP2O7) had reached 157.9mAh/g and 155.2mAh/g at the rate of 0.1 C, respectively. At 1C, the discharge capacity of the composite remained 125mAh/g after 100 cycles.
Guojun Zhang and Jessica Xu
Z. Y. Chen et al., "Synthesis and Electrochemical Properties of LiFe0.95Ti0.05Po4/(C+LiFeP2O7) Composite Material", Advanced Materials Research, Vols. 160-162, pp. 1588-1595, 2011