Synthesis and Electrochemical Properties of LiFe_0.95Ti_0.05Po₄/(C+LiFeP₂O₇) Composite Material

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 160-162)
• Pages: 1588-1595
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.160-162.1588
• Online since: November 2010
• Authors: Zhao Yong Chen, Jian Li Zhang, Hua Li Zhu, Wei Zhu, Qi Feng Li
• Keywords: Composite, Lithium Iron Phosphate, Phosphate, TiO₂

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