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首页> 外文期刊>Advanced energy materials >A Facile and Very Effective Method to Enhance the Mechanical Strength and the Cyclability of Si-Based Electrodes for Li-Ion Batteries
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A Facile and Very Effective Method to Enhance the Mechanical Strength and the Cyclability of Si-Based Electrodes for Li-Ion Batteries

机译：一种提高锂离子电池硅基电极机械强度和循环性的简便有效方法

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摘要

It is well known that the mechanical properties of lithium-ion battery electrodes impact their electrochemical performance. This is especially critical for Si-based negative electrodes, which suffer from large volume changes of the active mass upon cycling. Here, this study presents a postprocessing treatment (called maturation) that improves the mechanical and electrochemical stabilities of silicon-based anodes made with an acidic aqueous binder. It consists of storing the electrode in a humid atmosphere for a few days before drying and cell assembly. This results in a beneficial in situ reactive modification of the interfaces within the electrode. First, the binder tends to concentrate at the silicon interparticle contacts. As a result, the cohesion of the composite film is strengthened. Second, the corrosion of the copper current collector, inducing the formation of copper carboxylate bonds, improves the adhesion of the composite film. The great improvement of the mechanical stability of the matured electrode is confirmed by in-operando optical microscopy showing the absence of film delamination. The result is a significant electrochemical performance gain, up to a factor 10, compared to a not-matured electrode. This maturation procedure can be applied to other types of electrodes for improving their electrochemical performance and also their handling during cell manufacturing.
机译：众所周知，锂离子电池电极的机械性能会影响其电化学性能。这对于硅基负极特别重要，因为硅基负极在循环时会遭受活性物质的大量体积变化。在这里，这项研究提出了一种后处理方法（称为成熟），可以改善由酸性水性粘合剂制成的硅基阳极的机械和电化学稳定性。它包括在干燥和组装电池之前将电极在潮湿的环境中存放几天。这导致电极内界面的有益的原位反应性改性。首先，粘合剂倾向于集中在硅颗粒间接触处。结果，增强了复合膜的内聚力。第二，铜集流体的腐蚀，诱导形成羧酸铜键，提高了复合膜的粘附性。成熟的电极的机械稳定性有了很大的提高，这是通过操作内光学显微镜证实的，表明没有薄膜分层。与未成熟的电极相比，结果是获得了高达10倍的显着电化学性能增益。该成熟过程可以应用于其他类型的电极，以改善其电化学性能以及电池制造过程中的处理性能。

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  • 来源
    《Advanced energy materials》 |2018年第6期|1701787.1-1701787.13|共13页
  • 作者

    Hernandez Cuauhtemoc Reale; Etiemble Aurelien; Douillard Thierry; Mazouzi Driss; Karkar Zouina; Maire Eric; Guyomard Dominique; Lestriez Bernard; Roue Lionel;

  • 作者单位

    INRS, Ctr Energie, Mat, Telecommun EMT, 1650 Blvd Lionel Boulet, Varennes, PQ J3X 1S2, Canada;

    CNRS, MATEIS, INSA Lyon, UMR 5510, F-69621 Villeurbanne, France;

    CNRS, MATEIS, INSA Lyon, UMR 5510, F-69621 Villeurbanne, France;

    Univ Sidi Mohamed Ben Abdellah, Multidisciplinary Fac Taza, Mat Nat Subst Environm & Modeling Lab, Fes 30000, Morocco;

    INRS, Ctr Energie, Mat, Telecommun EMT, 1650 Blvd Lionel Boulet, Varennes, PQ J3X 1S2, Canada|Univ Nantes, Inst Mat Jean Rouxel IMN, CNRS, UMR 6502, F-44322 Nantes 3, France;

    CNRS, MATEIS, INSA Lyon, UMR 5510, F-69621 Villeurbanne, France;

    Univ Nantes, Inst Mat Jean Rouxel IMN, CNRS, UMR 6502, F-44322 Nantes 3, France;

    Univ Nantes, Inst Mat Jean Rouxel IMN, CNRS, UMR 6502, F-44322 Nantes 3, France;

    INRS, Ctr Energie, Mat, Telecommun EMT, 1650 Blvd Lionel Boulet, Varennes, PQ J3X 1S2, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    binder; electrode processing; lithium-ion batteries; mechanical properties; silicon anode;

    机译：粘结剂;电极处理;锂离子电池;机械性能;硅阳极;

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