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Transcritical CO2 extraction of electrolytes for lithium-ion batteries: optimization of recycling process and quality-quantity variation

Abstract

Electrolyte solutions have vital function in lithium-ion batteries. In consideration of toxic and harmful characteristics and widespread applications in the EVs, the treatment or recovery of electrolyte needs to be concerned and accurately analysis for the resource and environment benefits. In this work, we present a highly-selected electrolyte recovery method---transcritical CO2 extraction that combined the extracted process with the separated together. The use of response surface methodology helps with obtaining a simplified and optimized extraction protocol under room temperature and low pressure with savings of time and reagents. In order to evaluate these extracts, various techniques like GC-MS, GC-FID, FITR and NMR were applied. The GC-FID quantitative analysis and calculation formula may help with realizing the oriented control of the extract process, and hexafluorophosphate (PF6−), fluoride (F−) and difluorophosphate (PO2F2−) detected by both 19F and 31P spectrum imply the degradation pathway.

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Publication details

The article was received on 08 Mar 2017, accepted on 08 Jun 2017 and first published on 08 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ00771J
Citation: New J. Chem., 2017, Accepted Manuscript
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    Transcritical CO2 extraction of electrolytes for lithium-ion batteries: optimization of recycling process and quality-quantity variation

    D. Mu, Y. Liu, R. Li, Q. Ma and C. Dai, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ00771J

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