Abstract
Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>/C and Li3V2-xTix (PO<sub>4</sub>)<sub>3</sub>/C (x=0.03, 0.05, 0.07) cathode materials are synthesized by a solid-state method and a sol-gel method, respectively. X-ray diffraction (XRD) and scanning electronic microscopic (SEM) are employed to characterize the structures and morphologies of the as-prepared samples. The XRD patterns show that Ti-doping does not alter the monoclinic structure of Li<sub>3</sub>V<sub>2</sub> (PO<sub>4</sub>)<sub>3</sub> and does not create a new phase as well. The SEM images show that Ti-doping can prevent the aggregations of the fine grains compared with the pure Li<sub>3</sub>V<sub>2</sub> (PO<sub>4</sub>)3/C. The electrochemical measurements show that Ti doping can improve the cycling and rate performance of LVP/C composite. The improved electrochemical properties of the Li<sub>3</sub>V<sub>2</sub>-xTix (PO<sub>4</sub>)<sub>3</sub>/C cathode materials may be attributed to the enhanced ionic and electronic conductivities caused by Ti doping.
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