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首页> 外文期刊>Journal of Energy Storage >Preventing lithium ion battery failure during high temperatures by externally applied compression
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Preventing lithium ion battery failure during high temperatures by externally applied compression

机译：通过外部压缩防止高温下的锂离子电池故障

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摘要

Lithium-ion cells can unintentionally be exposed to temperatures outside manufacturers recommended limits without triggering a full thermal runaway event. The question addressed in this paper is: Are these cells still safe to use? In this study, externally applied compression has been employed to prevent lithium ion battery failure during such events. Commercially available cells with Nickel Cobalt Manganese (NCM) cathodes were exposed to temperatures at 80 °C, 90 °C and 100 °C for 10 h, and electrochemically characterised before and after heating. The electrode stack structures were also examined using x-ray computed tomography (CT), and post-mortems were conducted to examine the electrode stack structure and surface changes. The results show that compression reduces capacity loss by −0.07%, 4.95% and 13.10% respectively, measured immediately after the thermal testing. The uncompressed cells at 80 °C showed no swelling, whilst 90 °C and 100 °C showed significant swelling. The X-ray CT showed that the uncompressed cell at 100 °C suffered de-lamination at multiple locations after test, and precipitations were found on the electrode surface. The post-mortem results indicates the compressed cell at 100 °C was kept tightly packed, and the electrode surface was uniform. The conclusion is that externally applied compression reduces delamination due to gas generation during high temperature excursions.
机译：锂离子电池可能会意外地暴露于制造商建议的限制温度范围内，而不会触发完全的热失控事件。本文解决的问题是：这些电池仍然可以安全使用吗？在这项研究中，已采用外部施加的压缩来防止锂离子电池在此类事件中发生故障。将带有镍钴锰（NCM）阴极的市售电池暴露于80°C，90°C和100°C的温度下10 h，并在加热之前和之后进行电化学表征。还使用X射线计算机断层扫描（CT）检查了电极堆的结构，并进行了验尸以检查电极堆的结构和表面变化。结果表明，压缩在热测试后立即测得的容量损失分别降低了-0.07％，4.95％和13.10％。 80°C时未压缩的细胞未显示肿胀，而90°C和100°C时未显示明显肿胀。 X射线CT显示，测试后100°C的未压缩电池在多个位置发生分层，并且在电极表面发现沉淀。验后结果表明，在100°C的压缩电池保持紧密包装，电极表面均匀。结论是外部施加的压缩减少了由于高温偏移期间气体产生而引起的分层。

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  • 来源
    《Journal of Energy Storage》 |2017年第10期|296-303|共8页
  • 作者

    Zhao Yan; Patel Yatish; Hunt Ian A.; Kareh Kristina M.; Holland Alexander A.; Korte Christian; Dear John P.; Yue Yan; Offer Gregory James;

  • 作者单位

    Department of Mechanical Engineering, Imperial College London, United Kingdom;

    Department of Mechanical Engineering, Imperial College London, United Kingdom;

    Department of Mechanical Engineering, Imperial College London, United Kingdom;

    Department of Earth Science and Engineering, Imperial College London, United Kingdom;

    Department of Mechanical Engineering, Imperial College London, United Kingdom;

    Department of Mechanical Engineering, Imperial College London, United Kingdom;

    Department of Mechanical Engineering, Imperial College London, United Kingdom;

    Beijing Institute of Aeronautical Materials (BIAM), China,Beijing Engineering Research Centre of Advanced Structural Transparencies for the Modern Traffic System, China;

    Department of Mechanical Engineering, Imperial College London, United Kingdom;

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

    Compression; Degradation; High temperature; Lithium-ion battery;

    机译：压缩;降解;高温;锂离子电池;

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