Investigating lithium-ion battery materials during overcharge-induced thermal runaway: an operando and multi-scale X-ray CT study
Investigating lithium-ion battery materials during overcharge-induced thermal runaway: an operando and multi-scale X-ray CT study
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DOI：
10.1039/c6cp04251a
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发表时间：
2016-01-01
影响因子：
3.3
通讯作者：
Shearing, Paul R.
中科院分区：
文献类型：
--
作者：
Finegan, Donal P.;Scheel, Mario;Shearing, Paul R.
锂离子电池的灾难性故障会在多个长度尺度和非常短的时间内发生。高速操作断层扫描、热成像和电化学测量相结合，通过其相互关联的动态结构、热和电响应来探测导致 LiCoO2 软包电池过充电引起的热失控的退化机制。使用事后多尺度断层扫描方法探索了跨多个长度尺度的失效机制，揭示了 LiCoO2 电极微观结构的显着形态和相变化以及位置依赖性退化。这种结合操作和多尺度 X 射线计算机断层扫描 (CT) 技术被证明是了解电池退化和故障的综合方法。
Catastrophic failure of lithium-ion batteries occurs across multiple length scales and over very short time periods. A combination of high-speed operando tomography, thermal imaging and electrochemical measurements is used to probe the degradation mechanisms leading up to overcharge-induced thermal runaway of a LiCoO2 pouch cell, through its interrelated dynamic structural, thermal and electrical responses. Failure mechanisms across multiple length scales are explored using a post-mortem multiscale tomography approach, revealing significant morphological and phase changes in the LiCoO2 electrode microstructure and location dependent degradation. This combined operando and multi-scale X-ray computed tomography (CT) technique is demonstrated as a comprehensive approach to understanding battery degradation and failure.