Online Digital Holographic Method for Interface Reaction Monitoring in Lithium-Ion Batteries
Online Digital Holographic Method for Interface Reaction Monitoring in Lithium-Ion Batteries
复制标题
锂离子电池界面反应在线数字全息监测方法
DOI：
10.1021/acs.jpcc.7b09920
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发表时间：
2017
影响因子：
3.7
通讯作者：
Kumar R. Vasant
中科院分区：
文献类型：
--
作者：
Lai Chao;Yuan Boyu;Dai Hongliu;Xi Kai;Harris Christopher J.;Wang Chao;Kumar R. Vasant
了解电极与电解质界面的反应机理是提高锂离子电池性能的基础和必要条件。在此，我们报告了一种在线数字全息方法来原位观察锂离子电池中电极和电解质之间的整个界面变化。该技术的准确性分别在LiFePO4/石墨全电池体系、ec基电解质和pc基电解质中石墨/锂半电池体系中得到了很好的验证，并得到了扫描电子显微镜和x射线光电子能谱等常规仪器表征结果的支持。特别是，数字全息方法的时间分辨率为0.04 s，并且足够快，可以分辨出碳酸乙烯酯（EC）还原过程的细节，其中EC将首先还原生成烷基碳酸锂，然后还原产物Li2CO3形成稳定的SEI薄膜。据我们所知，这是关于……的第一份报告。
Understanding the reaction mechanisms at the interface of electrode and electrolyte is both of fundamental interest and essential to improve lithium-ion battery (LIB) performance. Herein, we report an online digital holographic method to in situ observe the entire interface change between electrode and electrolyte in lithium-ions batteries. The accuracy of this technology is well verified in LiFePO4/graphite full-cell systems, graphite/Li half-cell systems in EC-based and PC-based electrolyte, respectively, and supported by the characterized results of conventional instruments, including scanning electron microscopy and X-ray photoelectron spectroscopy. In particular, the time resolution of the digital holographic method is 0.04 s and fast enough to distinguish detail reduction process of ethylene carbonate (EC), for which EC will be first reduced to generate lithium alkyl carbonates, and then the reduction product is Li2CO3 to form a stable SEI films. To our best of knowledge, this is the first report on...