Electrochemical Degradation Caused by Mechanical Damage in Silicon Negative Electrodes
Electrochemical Degradation Caused by Mechanical Damage in Silicon Negative Electrodes
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硅负极机械损伤引起的电化学降解
DOI：
10.1149/07520.0031ecst
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Toshiyuki Hashida
中科院分区：
文献类型：
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作者：
Naoki Yoshida;Tadashi Sakamoto;Naoaki Kuwata;Junichi Kawamura;Kazuhisa Sato;Toshiyuki Hashida
硅具有高的电化学容量，是一种很有前途的锂离子电池负极材料。然而，硅在完全锂化条件下经历300~ 400%的体积膨胀，并遭受严重的容量衰减，这限制了其在商业电池中的成功应用。在这项研究中，我们使用原位声发射方法检测硅电极中的机械损伤。本研究揭示了锂离子电池硅电极的降解机理。结果表明，硅电极的长期性能取决于其在放电过程中的空间分布。本研究表明，开发的AE方法是一个强大的工具来检查的机械损伤和电化学降解的锂离子电池电极。
Silicon is a promising anode material for lithium ion batteries application due to its high electrochemical capacity. Unfortunately, silicon undergoes a volume expansion of 300~ 400% under the full lithiation condition and suffers from severe capacity fade, which limits its successful application in commercial cells. In this study, we used in situ acoustic emission method for detecting mechanical damage in the silicon electrode. The present study revealed the mechanism of degradation in a silicon electrode of the lithium ion batteries. It was shown that the long-term performance of silicon electrode was dictated by its spallation during the discharge processes. This study demonstrated that the AE method developed was a powerful tool to examine the mechanical damage and electrochemical degradation in lithium ion battery electrodes.