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Ultrafast laser microstructuring of LiFePO_4 cathode material

机译：LiFePO_4正极材料的超快激光显微组织

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摘要

LiFePO_4 is a very promising material to be used as positive electrode for future lithium-ion batteries. Nevertheless, a reduced rate capability at high discharging and charging currents is the main drawback. In this work, a 3D structure was made in LiFePO_4 composite electrodes by applying ultrafast laser ablation. The change of the electrochemical properties in a lithium-ion half-cell due to laser structuring was studied in detail and will be discussed. The main challenging goal is to correlate cell properties such as capacity retention with laser parameters and laser generated microstructure. For microstructuring electrode materials an ultrafast as well as a ns fiber laser were used. The pulse duration was varied in the range from 350 fs to 200 ns. With ultrashort laser radiation, the ablation efficiency was increased. Electrochemical characterisations were performed. For this purpose, Swagelok~® test cells with lithium metal as counter electrode were assembled. Main electrochemical parameters such as specific capacity and cycle stability were determined for the cells with structured and unstructured cathodes. It was shown that the rate capability for the cells with structured cathodes in comparison to cells with unstructured cathodes was significantly enhanced, especially for high charging and discharging rates.
机译：LiFePO_4是非常有前途的材料，可用作未来锂离子电池的正极。然而，在高放电和充电电流下降低的速率能力是主要缺点。在这项工作中，通过应用超快激光烧蚀在LiFePO_4复合电极中制成3D结构。详细研究了由于激光结构化而导致的锂离子半电池中电化学性能的变化，并将对此进行讨论。主要的挑战性目标是将电池性能（例如容量保持率）与激光参数和激光产生的微结构相关联。对于微结构化电极材料，使用了超快以及ns光纤激光器。脉冲持续时间在350 fs至200 ns的范围内变化。使用超短激光辐射，可以提高烧蚀效率。进行了电化学表征。为此，组装了以锂金属为对电极的世伟洛克®测试电池。确定了具有结构化和非结构化阴极的电池的主要电化学参数，例如比容量和循环稳定性。结果表明，与具有非结构化阴极的电池相比，具有结构化阴极的电池的倍率能力得到了显着提高，特别是对于高充电和放电速率而言。

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  • 来源
    《Laser-based micro- and nanoprocessing VIII》|2014年|89680M.1-89680M.9|共9页
  • 会议地点 San Francisco CA(US)
  • 作者

    M. Mangang; J. Proell; C. Tarde; H.J. Seifert; W. Pfleging;

  • 作者单位

    Karlsruhe Institute of Technology, IAM - AWP, H.-von-Helmholtz-Platz, 76344 Egg.-Leopoldshafen, Germany;

    Karlsruhe Institute of Technology, IAM - AWP, H.-von-Helmholtz-Platz, 76344 Egg.-Leopoldshafen, Germany;

    Karlsruhe Institute of Technology, IAM - AWP, H.-von-Helmholtz-Platz, 76344 Egg.-Leopoldshafen, Germany;

    Karlsruhe Institute of Technology, IAM - AWP, H.-von-Helmholtz-Platz, 76344 Egg.-Leopoldshafen, Germany;

    Karlsruhe Institute of Technology, IAM - AWP, H.-von-Helmholtz-Platz, 76344 Egg.-Leopoldshafen, Germany,Karlsruhe Nano Micro Facility, H.-von-Helmholtz-Platz 1, 76344 Egg.-Leopoldshafen, Germany;

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

    3D battery; ultrasfast laser; LiFePO_4;

    机译：3D电池；超快激光LiFePO_4;

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