高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (8): 1442-1449.doi: 10.7503/cjcu20160839

• 物理化学 • 上一篇    下一篇

0/1/2维混合纳米形貌V2 O5的制备与储锂性能

谢志平, 姚金环, 刘参政, 姜吉琼, 李延伟   

  1. 广西电磁化学功能物质重点实验室, 桂林理工大学化学与生物工程学院, 桂林 541004
  • 收稿日期:2016-11-28 修回日期:2017-07-17 出版日期:2017-08-10 发布日期:2017-07-17
  • 通讯作者: 李延伟,男,博士,教授,主要从事化学电源新材料的制备与性能研究.E-mail:lywhit@126.com E-mail:lywhit@126.com
  • 基金资助:

    国家自然科学基金(批准号:51664012,51464009)、广西自然科学基金(批准号:2015GXNSFGA139006)和桂林理工大学研究生优质课程建设项目(批准号:105962014yzkc002)资助.

Preparation and Lithium Storage Performance of Nanostructured V2O5 with 0/1/2 Dimensional Hybrid Morphologies

XIE Zhiping, YAO Jinhuan, LIU Canzheng, JIANG Jiqiong, LI Yanwei   

  1. Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China
  • Received:2016-11-28 Revised:2017-07-17 Online:2017-08-10 Published:2017-07-17
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.51664012, 51464009), the Guangxi Natural Science Foundation, China(No.2015GXNSFGA139006) and the Project of High-quality Course Construction for Postgraduate in Guilin University of Technology, China(No.105962014yzkc002).

摘要:

以P123为结构导向剂,采用溶胶-凝胶法结合冷冻干燥技术制备了0/1/2维混合纳米形貌的正交相V2O5电极活性材料.利用XRD和SEM表征了样品的结构和形貌,通过循环伏安法、恒流充放电和交流阻抗谱测试研究了样品的储锂性能.结果显示,这种0/1/2维混合纳米形貌V2O5具有较高的储锂容量、优异的电化学循环稳定性和出色的大倍率充放电性能,在1 A/g电流密度下循环500次后放电比容量稳定在117.5 mA·h/g,容量保持率为94.4%,在5 A/g大电流密度下,其放电比容量仍保持在88.2 mA·h/g,性能明显优于未添加P123制备的2D片状V2O5材料.

关键词: 锂离子电池, 正极材料, 五氧化二钒, 纳米材料, 储锂性能

Abstract:

Orthorhombic V2O5 nanomaterial with 0/1/2 dimensional hybrid morphologies(H-V2O5) was prepared by sol-gel method combined with freeze-drying technique using P123 as structure-directing agent. The microstructure and morphology of the prepared samples were analyzed by X-ray diffraction(XRD) and Scanning electron microscopy(SEM), and the lithium sto-rage performance was characterized by cyclic voltammetry(CV), constant current charge/discharge, and electrochemical impedance spectroscopy(EIS) tests. The results showed that H-V2O5 possessed high lithium sto-rage capacity, excellent cycling stability, and outstan-ding high rate capability. When cycled at a constant current density of 1 A/g, the H-V2O5 delivered a stable discharge capacity of 117.5 mA·h/g after 500 cycles, corresponding to capacity retention of 94.4%; even at a very high current density of 5 A/g, the H-V2O5 still showed a discharge capacity of 88.2 mA·h/g, which is much superior than that for two dimensional sheet-like V2O5 nanomaterial prepared without the assistance of P123.

Key words: Lithium-ion battery, Cathode material, V2O5, Nanomaterial, Lithium storage performance

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