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首页> 外文会议>Charging amp; infrastructure symposium 2018 >Improved Cycling Performance of Silicon/Carbon-Electrodes by Surface Modification of Active Materials and Neutralization of Poly(Acrylic Acid)-Binder
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Improved Cycling Performance of Silicon/Carbon-Electrodes by Surface Modification of Active Materials and Neutralization of Poly(Acrylic Acid)-Binder

机译：通过活性材料的表面改性和中和聚丙烯酸粘合剂来改善硅/碳电极的循环性能

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摘要

Silicon (Si) containing anodes for lithium ion batteries have recently attracted much attention due to the reversible electrochemical alloying of lithium and the high specific capacity of Si.[l] However, the significant volume changes of Si occurring during the alloying and de-alloying process lead to an unacceptable capacity fading of such electrodes.[2] The increase of the mechanical stability of Si-based electrodes requires the development of binders which interact with Si and can inhibit the loss of the electronic contact between the active material particles and the conductive carbon network. [3] In this contribution, we present new methods for the optimization of the cycling performance of Si containing electrodes which are prepared with poly(acrylic acid) (PAA) as binder. The influence of the neutralization of PAA with lithium hydroxide on the irreversible capacity during the formation cycles and the cycling stability of electrodes are investigated. Furthermore, the Si/binder-ratio has been varied for the optimization of the composition and the cycling performance of electrodes. A possible mechanism of the interaction between PAA and its neutralized derivatives is postulated, based on the chemical interactions between binder and surface groups of the active materials. The modification of the active materials is performed by liquid oxidizing agents at low temperature. The functional groups and the chemical reactions between PAA-binder and active materials are analyzed by thermogravimetric analysis, differential scanning calorimetry and fourier transform infrared spectroscopy, respectively. The mechanical stability of the electrodes after cycling is investigated by scanning electron microscopy. Additionally, the influence of electrolyte additives on the cycling behaviour of Si/PAA-electrodes is determined.
机译：由于锂的可逆电化学合金化和Si的高比容，最近用于锂离子电池的含硅（Si）负极引起了广泛关注。[1]然而，在合金化和脱合金过程中，Si的体积发生了重大变化工艺导致这种电极的容量衰减不可接受。[2]硅基电极的机械稳定性的提高要求开发与硅相互作用的粘合剂，并且可以抑制活性材料颗粒与导电碳网络之间电子接触的损失。 [3]在这项贡献中，我们提出了优化含硅电极的循环性能的新方法，这些电极是用聚丙烯酸（PAA）作为粘合剂制备的。研究了用氢氧化锂中和PAA对形成周期中不可逆容量和电极循环稳定性的影响。此外，为了优化电极的组成和循环性能，改变了Si /粘合剂的比例。根据粘合剂与活性物质表面基团之间的化学相互作用，推测了PAA及其中和衍生物之间相互作用的可能机理。活性材料的改性是在低温下通过液体氧化剂进行的。分别通过热重分析，差示扫描量热法和傅立叶变换红外光谱法分析了PAA粘合剂与活性材料之间的官能团和化学反应。通过扫描电子显微镜研究循环后电极的机械稳定性。另外，确定电解质添加剂对Si / PAA电极的循环行为的影响。

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  • 会议地点 Mainz(DE)
  • 作者

    Vassilios Siozios; Marcel Heidbuechel; Mirco Ruttert; Martin Winter; Tobias Placke;

  • 作者单位

    University of Munster, MEET Battery Research Center, Corrensstrasse 46, Munster, D-48149 Germany;

    University of Munster, MEET Battery Research Center, Corrensstrasse 46, Munster, D-48149 Germany;

    University of Munster, MEET Battery Research Center, Corrensstrasse 46, Munster, D-48149 Germany;

    University of Munster, MEET Battery Research Center, Corrensstrasse 46, Munster, D-48149 Germany;

    University of Munster, MEET Battery Research Center, Corrensstrasse 46, Munster, D-48149 Germany;

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