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Electrochemical and kinetic studies of ultrafast laser structured LiFePO_4 electrodes

机译：超快激光结构化LiFePO_4电极的电化学和动力学研究

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摘要

Due to a growing demand of cost-efficient lithium-ion batteries with an increased energy and power density as well as an increased life-time, the focus is set on intercalation cathode materials like LiFePO_4. It has a high practical capacity, is environmentally friendly and has low material costs. However, its low electrical conductivity and low ionic diffusivity are major drawbacks for its use in electrochemical storage devices or electric vehicles. By adding conductive agents, the electrical conductivity can be enhanced. By increasing the surface of the cathode material which is in direct contact with the liquid electrolyte the lithium-ion diffusion kinetics can be improved. A new approach to increase the surface of the active material without changing the active particle packing density or the weight proportion of carbon black is the laser-assisted generation of 3D surface structures in electrode materials. In this work, ultrafast laser radiation was used to create a defined surface structure in LiFePO_4 electrodes. It was shown that by using ultrashort laser pulses instead of nanosecond laser pulses, the ablation efficiency could be significantly increased. Furthermore, melting and debris formation were reduced. To investigate the diffusion kinetics, electrochemical methods such as cyclic voltammetry and galvanostatic intermittent titration technique were applied. It could be shown that due to a laser generated 3D structure, the lithium-ion diffusion kinetic, the capacity retention and cell life-time can be significantly improved.
机译：由于对具有成本效益的，具有增加的能量和功率密度以及增加的使用寿命的锂离子电池的需求不断增长，因此人们将重点放在诸如LiFePO_4之类的嵌入阴极材料上。它具有较高的实际生产能力，环保且材料成本低。然而，其低电导率和低离子扩散率是其在电化学存储设备或电动车辆中使用的主要缺点。通过添加导电剂，可以提高导电性。通过增加与液体电解质直接接触的阴极材料的表面，可以改善锂离子扩散动力学。在不改变活性颗粒堆积密度或炭黑重量比的情况下增加活性材料表面的新方法是在电极材料中激光辅助生成3D表面结构。在这项工作中，使用超快激光辐射在LiFePO_4电极中创建定义的表面结构。结果表明，通过使用超短激光脉冲代替纳秒激光脉冲，可以显着提高烧蚀效率。此外，减少了熔化和碎屑的形成。为了研究扩散动力学，应用了电化学方法，例如循环伏安法和恒电流间歇滴定技术。可以证明，由于激光产生的3D结构，锂离子扩散动力学，容量保持率和电池寿命可以得到显着改善。

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  • 来源
    《Laser-based micro- and nanoprocessing IX》|2015年|93510K.1-93510K.12|共12页
  • 会议地点 San Francisco CA(US)
  • 作者

    M. Mangang; P. Gotcu-Freis; H.J. Seifert; W. Pfleging;

  • 作者单位

    Karlsruhe Institute of Technology, IAM-AWP, H.-von-Helmholtz-Platz 1, 76344 Eggenstein -Leopoldshafen, Germany;

    Karlsruhe Institute of Technology, IAM-AWP, H.-von-Helmholtz-Platz 1, 76344 Eggenstein -Leopoldshafen, Germany;

    Karlsruhe Institute of Technology, IAM-AWP, H.-von-Helmholtz-Platz 1, 76344 Eggenstein -Leopoldshafen, Germany;

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

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

    LiFePO_4; cyclic voltammetry; galvanostatic intermittent titration technique; diffusion coefficient;

    机译：LiFePO_4；循环伏安法恒电流间歇滴定技术；扩散系数;

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