Affiliation:
1. Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences College of Materials Science and Opto‐Electronic Technology University of Chinese Academy of Sciences Beijing 100049 China
2. Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China
3. Thermo Fisher Scientific (China) Co. Ltd. Xinjinqiao Road Shanghai 201206 China
4. Tianmu Lake Institute of Advanced Energy Storage Technologies Co. Ltd. Liyang Jiangsu 213300 China
Abstract
AbstractSolid electrolyte interphase (SEI) plays an important role in regulating the interfacial ion transfer and safety of Lithium‐ion batteries (LIBs). It is unstable and readily decomposed releasing much heat and gases and thus triggering thermal runaway. Herein, in situ heating X‐ray photoelectron spectroscopy is applied to uncover the inherent thermal decomposition process of the SEI. The evolution of the composition, nanostructure, and the released gases are further probed by cryogenic transmission electron microscopy, and gas chromatography. The results show that the organic components of SEI are readily decomposed even at room temperature, releasing some flammable gases (e.g., H2, CO, C2H4, etc.). The residual SEI after heat treatment is rich in inorganic components (e.g., Li2O, LiF, and Li2CO3), provides a nanostructure model for a beneficial SEI with enhanced stability. This work deepens the understanding of SEI intrinsic thermal stability, reveals its underlying relationship with the thermal runaway of LIBs, and enlightens to enhance the safety of LIBs by achieving inorganics‐rich SEI.
Funder
Natural Science Foundation of Beijing Municipality
National Key Research and Development Program of China
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
24 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献