Affiliation:
1. Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100049 China
2. School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China
3. College of Materials Science and Opto‐Electronic Technology University of Chinese Academy of Sciences Beijing 100190 China
4. Tianmu Lake Institute of Advanced Energy Storage Technologies Co. Ltd Liyang Jiangsu 213300 China
Abstract
AbstractPrelithiation is an essential technology to compensate for the initial lithium loss of lithium‐ion batteries due to the formation of solid electrolyte interphase (SEI) and irreversible structure change. However, the prelithiated materials/electrodes become more reactive with air and electrolyte resulting in unwanted side reactions and contaminations, which makes it difficult for the practical application of prelithiation technology. To address this problem, herein, interphase engineering through a simple solution treatment after chemical prelithiation is proposed to protect the prelithiated electrode. The used solutions are carefully selected, and the composition and nanostructure of the as‐formed artificial SEIs are revealed by cryogenic electron microscopy and X‐ray photoelectron spectroscopy. The electrochemical evaluation demonstrates the unique merits of this artificial SEI, especially for the fluorinated interphase, which not only enhances the interfacial ion transport but also increases the tolerance of the prelithiated electrode to the air. The treated graphite electrode shows an initial Coulombic efficiency of 129.4%, a high capacity of 170 mAh g−1 at 3 C, and negligible capacity decay after 200 cycles at 1 C. These findings not only provide a facile, universal, and controllable method to construct an artificial SEI but also enlighten the upgrade of battery fabrication and the alternative use of advanced electrolytes.
Funder
Natural Science Foundation of Beijing Municipality
National Natural Science Foundation of China
National Key Research and Development Program of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
7 articles.
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