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Computational analysis of chemomechanical behaviors of composite electrodes in Li-ion batteries

机译：锂离子电池中复合电极化学机械行为的计算分析

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摘要

Mechanical reliability is a critical issue in all forms of energy conversion, storage, and harvesting. In Li-ion batteries, mechanical degradation caused by the repetitive swelling and shrinking of electrodes upon lithiation cycles is now well recognized; however, the impact of mechanical stresses on Li transport and hence the capacity of batteries is less obvious and underestimated. In particular, the stress field within the heterogeneous electrodes is complex, making the characterization of the chemomechanical behaviors of electrodes a challenging task. We develop a finite element program that computes the coupled Li diffusion and stresses in three-dimensional composite electrodes. We employ the reconstructed models of both cathode and anode materials to investigate the mechanical interactions of the constituents and their influence on the accessible capacity. The state of charge in the percolated particles is highly inhomogeneous regulated by the stress field. An ample space of design is open for the optimization of the capacity and mechanical performance of electrodes by tuning the size, shape, and pattern of active particles, as well as the properties of the inactive matrix.
机译：机械可靠性是所有形式的能量转换，存储和收集中的关键问题。在锂离子电池中，由锂离子在锂化循环中反复膨胀和收缩引起的机械性能退化已得到公认。然而，机械应力对锂传输的影响以及因此对电池容量的影响不那么明显，而且被低估了。特别地，异质电极内的应力场是复杂的，使得表征电极的化学机械性能成为一项艰巨的任务。我们开发了一个有限元程序，用于计算三维复合电极中耦合的Li扩散和应力。我们采用阴极和阳极材料的重建模型来研究成分的机械相互作用及其对可及容量的影响。渗透粒子中的电荷状态受到应力场的高度不均匀调节。通过调整活性颗粒的大小，形状和图案以及非活性基质的性质，为优化电极的容量和机械性能打开了充足的设计空间。

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  • 来源
    《Journal of Materials Research》 |2016年第18期|2715-2727|共13页
  • 作者

    Rong Xu; Luize Scalco de Vasconcelos; Kejie Zhao;

  • 作者单位

    School of Mechanical Engineering, Purdue University, West Lafayette, IN 47906, USA;

    School of Mechanical Engineering, Purdue University, West Lafayette, IN 47906, USA;

    School of Mechanical Engineering, Purdue University, West Lafayette, IN 47906, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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