Abstract
Core-shell LiFePO 4@C composites were synthesized successfully from FePO 4/C precursor using the polyvinyl alcohol (PVA) as the reducing agent, followed by a chemical vapor deposition (CVD) assisted solid-state reaction in the presence of Li 2CO 3. Some physical and chemical properties of the products were characterized by X-ray powder diffraction (XRD), Raman, SEM, TEM techniques. The effect of morphology and electrochemical properties of the composites were thoroughly investigated. XRD patterns showed that LiFePO 4 has an order olivine structure with space group of Pnma. TEM micrographs exhibited that the LiFePO 4 particles encapsulated with 3-nm thick carbon shells. The powders were homogeneous with grain size of about 0.8 μm. Compared with those synthesized by traditional organic carbon source mixed method, LiFePO 4@C composite synthesized by CVD method exhibited better discharge capacity at initial 155.4 and 135.8 mAh g −1 at 0.1C and 1C rate, respectively. It is revealed that the carbon layer coated on the surface of LiFePO 4 and the amorphous carbon wrapping and connecting the particles enhanced the electronic conductivity and rate performances of the cathode materials.
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