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Diode laser heat treatment of lithium manganese oxide films

机译：锂锰氧化物薄膜的二极管激光热处理

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摘要

The crystallization of lithium manganese oxide thin films prepared by radio frequency magnetron sputtering on stainless steel substrates under 10 Pa argon pressure is demonstrated by a laser annealing technique. Laser annealing processes were developed as a function of annealing time and temperature with the objective to form an electrochemically active lithium manganese oxide cathode. It is demonstrated, that laser annealing with 940 nm diode laser radiation and an annealing time of 2000 s at 600 C delivers appropriate parameters for formation of a crystalline spinel-like phase. Characteristic features of this phase could be detected via Raman spectroscopy, showing the characteristic main Raman band at 627 cm~(-1). Within cyclic voltammetric measurements, the two characteristic redox pairs for spinel lithium manganese oxide in the 4 V region could be detected, indicating that the film was well-crystallized and de-/intercalation processes were reversible. Raman post-analysis of a cycled cathode showed that the spinel-like structure was preserved within the cycling process but mechanical degradation effects such as film cracking were observed via scanning electron microscopy. Typical features for the formation of an additional surface reaction layer could be detected using X-ray photoelectron spectroscopy.
机译：通过激光退火技术证明了通过射频磁控溅射在不锈钢基板上于10 Pa氩气压力下制备的锂锰氧化物薄膜的晶化。激光退火工艺是根据退火时间和温度而开发的，目的是形成电化学活性的锂锰氧化物阴极。结果表明，用940 nm二极管激光辐射进行的激光退火和600℃的2000 s退火时间为形成晶状尖晶石相提供了适当的参数。可以通过拉曼光谱检测该相的特征，显示出在627 cm〜（-1）处的主要拉曼谱带。在循环伏安法测量中，可以检测到4 V区域中的尖晶石锂锰氧化物的两个特征氧化还原对，表明该膜结晶良好，脱/插层过程可逆。拉曼对循环阴极的后分析表明，在循环过程中保留了尖晶石状结构，但通过扫描电子显微镜观察到了机械降解作用，例如膜破裂。可以使用X射线光电子能谱检测形成额外的表面反应层的典型特征。

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  • 来源
    《Applied Surface Science》 |2012年第12期|p.5146-5152|共7页
  • 作者

    J. Proell; R.Kohler; A. Mangang; S.Ulrich; M.Bruns; H.J.Seifert; W. Pfleging;

  • 作者单位

    Karlsruhe Institute of Technology, Institute for Applied Materials, P.O. Box 3640, 76021 Karlsruhe, Germany;

    Karlsruhe Institute of Technology, Institute for Applied Materials, P.O. Box 3640, 76021 Karlsruhe, Germany;

    Karlsruhe Institute of Technology, Institute for Applied Materials, P.O. Box 3640, 76021 Karlsruhe, Germany;

    Karlsruhe Institute of Technology, Institute for Applied Materials, P.O. Box 3640, 76021 Karlsruhe, Germany;

    Karlsruhe Institute of Technology, Institute for Applied Materials, P.O. Box 3640, 76021 Karlsruhe, Germany;

    Karlsruhe Institute of Technology, Institute for Applied Materials, P.O. Box 3640, 76021 Karlsruhe, Germany;

    Karlsruhe Institute of Technology, Institute for Applied Materials, P.O. Box 3640, 76021 Karlsruhe, Germany,Karlsruhe Nano Micro Facility, H.-von-HelmhoItz-Platz 1, 76344 Egg.-Leopoldshafen, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    laser annealing; thin film crystallization; lithium-ion battery; lithium manganese oxide; surface reaction layer;

    机译：激光退火薄膜结晶;锂离子电池;锰酸锂;表面反应层;

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