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高等学校化学研究 ›› 2010, Vol. 26 ›› Issue (2): 291-293.

• Articles • 上一篇    下一篇

Physical and Electrochemical Characterization of Hydrothermal Prepared α′-NaV2O5 Crystals

HU Fang, WEI Ying-jin, JIANG Tao, MING Xing, CHEN Gang and WANG Chun-zhong*   

  1. College of Physics, State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P. R. China
  • 收稿日期:2009-04-09 修回日期:2009-07-03 出版日期:2010-03-25 发布日期:2010-05-25
  • 通讯作者: WANG Chun-zhong. E-mail: wcz@mail.jlu.edu.cn
  • 基金资助:

    Supported by the National Natural Science Foundation of China(No.50672031) and the Foundation of Science and Techno- logy Department of Jilin Province, China(No.20075007).

Physical and Electrochemical Characterization of Hydrothermal Prepared α′-NaV2O5 Crystals

HU Fang, WEI Ying-jin, JIANG Tao, MING Xing, CHEN Gang and WANG Chun-zhong*   

  1. College of Physics, State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P. R. China
  • Received:2009-04-09 Revised:2009-07-03 Online:2010-03-25 Published:2010-05-25
  • Contact: WANG Chun-zhong. E-mail: wcz@mail.jlu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.50672031) and the Foundation of Science and Techno- logy Department of Jilin Province, China(No.20075007).

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摘要：

α′-NaV2O5 was prepared by a simple hydrothermal process. X-ray diffraction confirmed the orthorhombic structure of α′-NaV2O5, with preferential growth along the (001) direction. Scanning electron microscopy showed α′-NaV2O5 was composed of flake-shaped crystals. X-ray photoelectron spectroscopy confirmed the co-existence of V4+ and V5+ in α′-NaV2O5, which results in an average V4.5+ oxidation state of α′-NaV2O5. The observed Raman bands are ascribed to different V―O vibrations. α′-NaV2O5 shows a reversible specific capacity of about 100 mA·h·g–1 between 3.5 and 1.0 V, with a good capacity retention. The good electrochemical stability of the material is attributed to its structural stability during Li+ intercalation.

关键词: Lithium ion battery; Vanadium bronze; Electrochemical performance

Abstract:

α′-NaV2O5 was prepared by a simple hydrothermal process. X-ray diffraction confirmed the orthorhombic structure of α′-NaV2O5, with preferential growth along the (001) direction. Scanning electron microscopy showed α′-NaV2O5 was composed of flake-shaped crystals. X-ray photoelectron spectroscopy confirmed the co-existence of V4+ and V5+ in α′-NaV2O5, which results in an average V4.5+ oxidation state of α′-NaV2O5. The observed Raman bands are ascribed to different V―O vibrations. α′-NaV2O5 shows a reversible specific capacity of about 100 mA·h·g–1 between 3.5 and 1.0 V, with a good capacity retention. The good electrochemical stability of the material is attributed to its structural stability during Li+ intercalation.

Key words: Lithium ion battery; Vanadium bronze; Electrochemical performance