Operando analysis of thermal runaway in lithium ion battery during nail-penetration test using an X-ray inspection system

Tokihiko Yokoshima*, Daikichi Mukoyama, Fujio Maeda, Tetsuya Osaka, Koji Takazawa, Shun Egusa

*この研究の対応する著者

研究成果: Article査読

11 被引用数 (Scopus)

抄録

The thermal runaway of a lithium ion battery (LIB) during a nail-penetration test was investigated using an LIB internal short circuit observation system equipped with an X-ray scanner (LiSC scanner). Using high-speed moving images and high-precision voltage measurements, the layer-by-layer internal short circuit caused by the nail was clearly observed during nail motion. Following this motion, gas generation outside the cell, which is well-known in thermal runaway, was observed. The main causes of smoke are speculated to be the boiling of the electrolyte and/or decomposition of the active materials owing to heating by the short circuit current. The initial behavior of the short circuit before gas generation was clearly observed. Therefore, gas generation, which is well-known to indicate an internal short circuit of the cell, and the electrical behavior of the short circuit during the nail-penetration test were observed separately. This LiSC scanner allowed us to analyze the details of the internal short circuit of the cell, and it is expected to lead to significant advancements in the safety of LIBs.

本文言語English
ページ(範囲)A1243-A1250
ジャーナルJournal of the Electrochemical Society
166
6
DOI
出版ステータスPublished - 2019

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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