期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 20, 期 48, 页码 10841-10846出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm01252a
关键词
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资金
- National Science Foundation [CMMI 1030048]
- Air Force Office of Scientific Research (AFOSR-MURI) [FA9550-06-1-0326]
- Chinese Scholarship Council
Mn-doped V2O5 has been prepared by sol-gel processing with H2O2 and V2O5 as precursors with Mn2+ added directly during sol preparation. Stable and homogeneous Mn-doped vanadium oxide sol was obtained and the films were fabricated by dip-coating, drying at ambient, and then annealing at 250 degrees C in air for 3 h. X-Ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and electrochemical analyses have been employed to characterize and analyze the crystal-and microstructures, surface morphology and Li-ion intercalation properties of both Mn-doped and undoped V2O5 films. Mn-doped V2O5 films exhibit excellent cyclic stability with a fading rate of less than 0.06% per cycle, significantly better than that of the pure V2O5 films (0.8% per cycle). Mn-doped V2O5 films have demonstrated a large discharge capacity of similar to 283mAh/g with a current density of 68 mA/g, again much higher than 237 mAh/g of V2O5 films. A possible explanation for such significant enhancement in lithium ion intercalation capacity, cyclic stability, and rate performance of Mn-doped V2O5 films has been discussed.
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