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Mechanical property measurements of heterogeneous materials by selective nanoindentation: Application to LiMn_2O_4 cathode

机译：选择性纳米压痕法测量异质材料的力学性能：在LiMn_2O_4阴极上的应用

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摘要

Mechanical properties of composite materials for application as electrodes in batteries have been measured by means of selective statistical nanoindentation. The sample is strongly heterogeneous, as it consists of LiMn_2O_4 particles, carbon black and PVDF embedded in a soft and compliant epoxy matrix. For comparison, a similar composite sample of SiO_2 particles in epoxy was prepared. The difference in terms of elastic modulus between the matrix and the particles is of one order of magnitude. Structural compliance and edge effects induce inconsistent tests which in return cause spurious measurements. A 2-step filtering method has been designed to overcome this problem. This automated method consists in identifying spurious tests and withdraw them from the final statistical analysis. First, nonquadratic load versus displacement curves are filtered out. Then, the Joslin-Oliver analysis is used to filter out tests with an apparent structural compliance. The method greatly improves the noise to signal ratio. After deconvolution, the E-modulus of the silica particles was measured as 69.8 GPa ( ±1.2). It shows the reliability of the method. 105 GPa ( ± 7.5) was found for the LiMn_2O_4 particle E-modulus. After pile-up correction, the real E-modulus of LiMn_2O_4 particles is estimated to be 13% smaller. The developed method has been demonstrated to be an effective tool to investigate mechanical properties of composites.
机译：已经通过选择性统计纳米压痕法测量了用作电池中电极的复合材料的机械性能。样品是高度异质的，因为它由LiMn_2O_4颗粒，炭黑和PVDF嵌入柔软而柔顺的环氧基质中组成。为了比较，制备了类似的SiO 2颗粒在环氧树脂中的复合样品。基质和颗粒之间的弹性模量差异为一个数量级。结构的顺应性和边缘效应会引起不一致的测试，而这反过来会导致虚假的测量。设计了一种两步过滤方法来克服此问题。这种自动方法包括识别虚假测试并将其从最终统计分析中撤出。首先，滤除非二次载荷与位移曲线。然后，使用Joslin-Oliver分析筛选出具有明显结构顺应性的测试。该方法大大提高了信噪比。解卷积后，测得二氧化硅颗粒的E模量为69.8 GPa（±1.2）。它显示了该方法的可靠性。 LiMn_2O_4粒子的E模量为105 GPa（±7.5）。经过堆积校正后，LiMn_2O_4粒子的实际E模量估计要小13％。已证明开发的方法是研究复合材料力学性能的有效工具。

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  • 来源
    《Materials Science and Engineering》 |2014年第21期|92-102|共11页
  • 作者

    Hugues-Yanis Amanieu; Daniele Rosato; Marco Sebastiani; Federico Massimi; Doru C. Lupascu;

  • 作者单位

    Robert Bosch GmbH, Robert-Bosch-Platz 1, 70839 Gerlingen-Schillerhoehe, Germany,Institute for Materials Science, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, UniversitHtsstr. 15, 45141 Essen,Germany;

    Robert Bosch GmbH, Robert-Bosch-Platz 1, 70839 Gerlingen-Schillerhoehe, Germany;

    Engineering Department, University of Rome "ROMA TRE", Via delta Vasca Navale 79, 00146 Rome, Italy;

    Engineering Department, University of Rome "ROMA TRE", Via delta Vasca Navale 79, 00146 Rome, Italy;

    Institute for Materials Science, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, UniversitHtsstr. 15, 45141 Essen,Germany;

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

    Nanoindentation; Composites; Filter;

    机译：纳米压痕复合材料;过滤;

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