Journal
APPLIED SURFACE SCIENCE
Volume 596, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153572
Keywords
In-situ lithium electrochemical impedance; spectroscopy; Difluoro(Oxalato)borate; Solid electrolyte interface; Film forming mechanism
Categories
Funding
- National Natural Science Foundation of China [21766017]
- Major Science and Technology Projects of Gansu Province [21ZD4GA031]
- Science and Technology Development Fund Program for Centre Guiding Local of Gansu Province in China, Lanzhou science and technology program [2021-1-152]
- Incubation Program of Excellent Doctoral Dissertation-Lanzhou University of Technology
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The formation and evolution of the solid electrolyte interface (SEI) layer in lithium ion batteries is a challenging task. This study presents a potential resolved in-situ electrochemical impedance spectroscopy (PRIs-EIS) technique to investigate the SEI layer composition and interfacial reaction mechanism. The results show that more inorganic compounds accumulate in the SEI layer as the cycle continues, repairing the pore structure but decreasing the toughness. This cost-effective technique aids in the evaluation and design of electrolyte systems.
An understanding of the formation and evolution of the solid electrolyte interface (SEI) layer is still a challenge for lithium ion batteries due to its complexity and non-uniformity. Herein, an in-situ electrochemical technique, named potential resolved in-situ electrochemical impedance spectroscopy (PRIs-EIS), have developed to correlate the Nyquist and Bode plot changes with the voltammetric scan, which is then used to determine the correspondence between circuit components and SEI layer composition. Moreover, the formation and re-oxidation of organic compounds in the SEI layer are studied in conjunction with the electrochemical quartz crystal microbalance characteristics. In particular, it is shown that more inorganic compounds accumulate in the SEI layer as the cycle continues, repairing the pore structure, but decreasing the toughness of the SEI layer. The PRIs-EIS technique is shown to be a powerful, useful and cost-effective tool to illuminate the interfacial reaction mechanism, and the results from this technique aid in the evaluation and design of electrolyte systems.
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