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首页> 外文会议>Laser-based micro- and nanopackaging and assembly VI >Influence of laser-generated surface structures on electrochemical performance of lithium cobalt oxide
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Influence of laser-generated surface structures on electrochemical performance of lithium cobalt oxide

机译：激光产生的表面结构对钴酸锂电化学性能的影响

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摘要

The further development of energy storage devices especially of lithium-ion batteries plays an important role in the ongoing miniaturization process towards lightweight, flexible mobile devices. To improve mechanical stability and to increase the power density of electrode materials while maintaining the same footprint area, a three-dimensional battery design is necessary. In this study different designs of three-dimensional cathode materials are investigated with respect to the electrochemical performance. Lithium cobalt oxide is considered as a standard cathode material, since it has been in use since the first commercialization of lithium-ion batteries. Various electrode designs were manufactured in lithium cobalt oxide electrodes via laser micro-structuring. Laser ablation experiments in ambient air were performed to obtain hierarchical and high aspect surface structures. Laser structuring using mask techniques as well as the formation of self-organized conical surface structures were studied in detail. In the latter case a density of larger than twenty million microstructures per square centimeter was obtained with a significant increase of active surface area. Laser annealing was applied for the control of the average grain size and the adjustment of a crystalline phase which exhibits electrochemical capacities in the range of the practical capacity known for lithium cobalt oxide. An investigation of cycling stability with respect to annealing parameters such as annealing time and temperature was performed using a diode laser operating at 940 nm. Information on the phase and crystalline structure were obtained using Raman spectroscopy and X-ray diffraction analysis. The electrochemical performance of the laser modified cathodes was studied via cyclic voltammetry and galvanostatic testing using a lithium anode and a standard liquid electrolyte.
机译：能量存储设备（尤其是锂离子电池）的进一步发展在朝着轻巧，灵活的移动设备的持续小型化过程中发挥着重要作用。为了提高机械稳定性并增加电极材料的功率密度，同时保持相同的占地面积，三维电池设计是必要的。在这项研究中，就电化学性能研究了三维阴极材料的不同设计。钴酸锂被认为是标准的正极材料，因为自从锂离子电池首次商业化以来就一直使用它。通过激光微结构化在钴酸锂电极中制造了各种电极设计。在环境空气中进行激光烧蚀实验，以获得分层的高纵横比表面结构。详细研究了使用掩模技术进行的激光结构化以及自组织圆锥形表面结构的形成。在后一种情况下，获得的密度大于每平方厘米两千万个微结构，并且有效表面积显着增加。施加激光退火以控制平均晶粒尺寸和调整结晶相，该结晶相表现出在钴酸锂已知的实际容量范围内的电化学容量。使用在940 nm下工作的二极管激光器进行了有关退火参数（如退火时间和温度）的循环稳定性研究。使用拉曼光谱和X射线衍射分析获得有关相和晶体结构的信息。通过循环伏安法和恒电流测试，使用锂阳极和标准液体电解质，研究了激光改性阴极的电化学性能。

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  • 会议地点 San Francisco CA(US)
  • 作者

    R. Kohler; J. Proell; S. Ulrich; M. Przybylski; H.J. Setfert; W. Pfieging;

  • 作者单位

    Institute for Applied Materials - Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany;

    Institute for Applied Materials - Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany;

    Institute for Applied Materials - Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany;

    ATL Lasertechnik GmbH, Burger Str. 48,42929 Wermelskirchen, Germany;

    Institute for Applied Materials - Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany;

    Institute for Applied Materials - Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, 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 激光技术、微波激射技术;
  • 关键词

    laser structuring; laser annealing; lithium-ion battery; lithium cobalt oxide; cathode material; 3D battery;

    机译：激光结构化；激光退火锂离子电池;钴酸锂阴极材料； 3D电池;

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