4.6 Article

Electrochemical and Post-Mortem Degradation Analysis of Parallel-Connected Lithium-Ion Cells with Non-Uniform Temperature Distribution

期刊

出版社

ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac2a7c

关键词

Li-ion battery; degradation mechanism; non-uniformity; temperature distribution; solid electrolyte interface; lithium plating; post-mortem analysis

资金

  1. University of Alabama in Huntsville (UAH) Faculty Start-up Fund
  2. UAH New Faculty Research (NFR) Program
  3. National Science Foundation [CBET-1454437]

向作者/读者索取更多资源

Prior research on Li-ion cells connected in parallel and cycled long term revealed that non-uniform temperature distribution led to non-uniform and accelerated degradation. Degradation mechanisms were elucidated through electrochemical and post-mortem analysis, pinpointing solid electrolyte interface (SEI) layer growth and lithium plating as main factors in the abrupt failure of the middle cell. The observation and quantitative analysis shed light on the performance and reliability impacts of non-uniform conditions within lithium-ion batteries.
Prior work on Li-ion cells which were parallel-connected in a stack and subjected to long term cycling showed that non-uniform temperature distribution caused non-uniform and accelerated degradation. To elucidate the degradation mechanisms, electrochemical and post-mortem degradation analysis were performed. Electrochemical impedance spectroscopy analysis suggested that the main degradation mechanism for the middle cell was a solid electrolyte interface (SEI) layer growth. Nevertheless, post-mortem analysis using X-ray diffraction, optical microscope, and scanning electron microscopy paired with energy dispersive X-ray spectroscopy shows the presence of Li2CO3 in both baseline and middle cell anodes. This points towards a combined degradation mechanism of SEI layer growth and lithium plating. A combination of microstructural particle cracking and lithium plating is considered the main mechanism for blocking the anode's porosity network, which hindered further lithium diffusion, resulting in the abrupt failure for the middle cell. The observation and quantitative analysis provides insight into the performance and reliability impacts of non-uniform conditions within lithium-ion batteries.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据