M&M材料力学カンファレンス
Online ISSN : 2424-2845
セッションID: GS0608-254
会議情報
GS0608-254 リチウムイオン二次電池電極材料の機械的損傷に伴う電気化学的劣化の評価
吉田 尚生坂本 正桑田 直明河村 純一佐藤 一永橋田 俊之
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会議録・要旨集 フリー

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Silicon is a promising anode material for lithium-ion battery application due to its high specific capacity. However, when silicon is lithiated, it can undergo a volume expansion, which leads to an extensive fracturing. This is thought to be a primary cause of the rapid decay in cell capacity routinely observed.. To solve this problem, a more thorough understanding of how the material degrades is necessary to help cycling techniques that may be capable of reduce capacity fading. In this study, we report in situ acoustic emission and laser microscope observation of volume change in Si negative electrodes. The largest number of emissions occurred on the first lithiation and corresponding to volume change of the silicon negative electrode. this study demonstrates that AE and laser microscope observation is a powerful tool to survey the real-time mechanical damage and electrochemical degradation in the electrode.
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