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首页> 外文期刊>Advanced energy materials >V2O5 Nano-Electrodes with High Power and Energy Densities for Thin Film Li-Ion Batteries
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V2O5 Nano-Electrodes with High Power and Energy Densities for Thin Film Li-Ion Batteries

机译：具有高功率和能量密度的V2O5纳米电极，用于薄膜锂离子电池

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摘要

Nanostructured V2O5 thin films have been prepared by means of cathodic deposition from an aqueous solution made from V2O5 and H2O2 directly on fluorine-doped tin oxide coated (FTO) glasses followed by annealing at 500°C in air, and studied as film electrodes for lithium ion batteries. XPS results show that the as-deposited films contained 15% V4+, however after annealing all the vanadium is oxidized to V5+. The crystallinity, surface morphology, and microstructures of the films have been investigated by means of XRD, SEM, and AFM. The V2O5 thin film electrodes show excellent electrochemical properties as cathodes for lithium ion intercalation: a high initial discharge capacity of 402 mA h g−1 and 240 mA h g−1 is retained after over 200 cycles with a discharging rate of 200 mA g−1 (1.3 C). The specific energy density is calculated as 900 W h kg−1 for the 1st cycle and 723 W h kg−1 for the 180th cycle when the films are tested at 200 mA g−1 (1.3 C). When discharge/charge is carried out at a high current density of 10.5 A g−1 (70 C), the thin film electrodes retain a good discharge capacity of 120 mA h g−1, and the specific power density is over 28 kW kg−1.
机译：纳米结构的V2O5薄膜是通过将由V2O5和H2O2制成的水溶液直接阴极沉积在掺氟氧化锡涂层（FTO）的玻璃上，然后在空气中于500°C退火而制备的，并作为锂的薄膜电极进行研究离子电池。 XPS结果表明，沉积后的薄膜含有15％的V4 +，但是在退火后，所有钒均被氧化为V5 +。已经通过XRD，SEM和AFM研究了膜的结晶度，表面形态和微观结构。 V2O5薄膜电极具有出色的电化学性能，可作为嵌入锂离子的阴极：经过200个循环后，以200 mA g-1的放电速率保持了402 mA hg-1和240 mA hg-1的高初始放电容量（ 1.3 C）。当在200 mA g-1（1.3 C）下测试薄膜时，第一个循环的比能量密度计算为900 W h kg-1，第180个循环为723 W h kg-1。当以10.5 A g-1（70 C）的高电流密度进行放电/充电时，薄膜电极保持120 mA hg-1的良好放电容量，比功率密度超过28 kW kg- 1。

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  • 来源
    《Advanced energy materials》 |2011年第2期|1-9|共9页
  • 作者

    Yanyi Liu; Michael Clark; Qifeng Zhang; Danmei Yu; Dawei Liu; Jun Liu; Guozhong Cao;

  • 作者单位

    Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA;

    Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA;

    Department of Physics and Astronomy University of British Columbia Vancouver V6T 1Z1 Canada;

    Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA;

    Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA;

    Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA;

    College of Chemistry and Chemical Engineering Chongqing University Chongqing 400044 P.R. China;

    Pacific Northwest National Laboratory 902 Battelle Boulevard P.O.Box 999 Richland WA 99352 USA;

    Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    lithium-ion batteries; electrodes; nanostructures; thin films; vanadium oxide;

    机译：锂离子电池;电极;纳米结构;薄膜;氧化钒;

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