| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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LiCoO$_{2}$ Epitaxial Film Enabling Precise Analysis of Interfacial Degradations |
| Changdong Qin1, Le Wang2, Pengfei Yan1*, Yingge Du2*, and Manling Sui1* |
1Beijing Key Laboratory of Microstructure and Property of Solids, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
2Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory Richland, WA 99354, USA
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| Cite this article: |
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Changdong Qin, Le Wang, Pengfei Yan et al 2021 Chin. Phys. Lett. 38 068202 |
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Abstract Interfacial structure evolution and degradation are critical to the electrochemical performance of LiCoO$_{2}$ (LCO), the most widely studied and used cathode material in lithium ion batteries. To understand such processes requires precise and quantitative measurements. Herein, we use well-defined epitaxial LCO thin films to reveal the interfacial degradation mechanisms. Through our systematical investigations, we find that surface corrosion is significant after forming the surface phase transition layer, and the cathode electrolyte interphase (CEI) has a double layer structure, an inorganic inner layer containing CoO, LiF, LiOH/Li$_{2}$O and Li$_{x}$PF$_{y}$O$_{z}$, and an outmost layer containing Li$_{2}$CO$_{3}$ and organic carbonaceous components. Furthermore, surface cracks are found to be pronounced due to mechanical failures and chemical etching. This work demonstrates a model material to realize the precise measurements of LCO interfacial degradations, which deepens our understanding on the interfacial degradation mechanisms.
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Received: 09 February 2021
Published: 25 May 2021
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| Fund: Supported by the National Natural Science Fund for Innovative Research Groups (China) (Grant No. 51621003), the National Key Research and Development Program of China (Grant No. 2016Yu7FB0700700), the Beijing Municipal Fund for Scientific Innovation (Grant No. PXM2019_014204_500031) and the Beijing Municipal High Level Innovative Team Building Program (Grant No. IDHT20190503). The film growth is supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Science, Early Career Research Program under Award #68272, and performed using EMSL (grid.436923.9), a DOE Office of the Science User Facility sponsored by the Biological and Environmental Research Program. |
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