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Molecules 2017, 22(3), 403; doi:10.3390/molecules22030403

The Role of Sub- and Supercritical CO2 as “Processing Solvent” for the Recycling and Sample Preparation of Lithium Ion Battery Electrolytes

1
University of Muenster, MEET Battery Research Center, Corrensstraße 46, 48149 Münster, Germany
2
Helmholtz Institute Münster, IEK-12, Forschungszentrum Jülich, Corrensstraße 46, 48149 Münster, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Yu Yang
Received: 30 January 2017 / Accepted: 27 February 2017 / Published: 6 March 2017
(This article belongs to the Special Issue Sub- and Supercritical Fluids and Green Chemistry)
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Abstract

Quantitative electrolyte extraction from lithium ion batteries (LIB) is of great interest for recycling processes. Following the generally valid EU legal guidelines for the recycling of batteries, 50 wt % of a LIB cell has to be recovered, which cannot be achieved without the electrolyte; hence, the electrolyte represents a target component for the recycling of LIBs. Additionally, fluoride or fluorinated compounds, as inevitably present in LIB electrolytes, can hamper or even damage recycling processes in industry and have to be removed from the solid LIB parts, as well. Finally, extraction is a necessary tool for LIB electrolyte aging analysis as well as for post-mortem investigations in general, because a qualitative overview can already be achieved after a few minutes of extraction for well-aged, apparently “dry” LIB cells, where the electrolyte is deeply penetrated or even gellified in the solid battery materials. View Full-Text
Keywords: supercritical CO2; subcritical CO2; liquid CO2; lithium ion battery electrolytes; lithium ion battery; recycling; sample preparation; aging; post-mortem supercritical CO2; subcritical CO2; liquid CO2; lithium ion battery electrolytes; lithium ion battery; recycling; sample preparation; aging; post-mortem
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Nowak, S.; Winter, M. The Role of Sub- and Supercritical CO2 as “Processing Solvent” for the Recycling and Sample Preparation of Lithium Ion Battery Electrolytes. Molecules 2017, 22, 403.

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