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Thermally Depolymerizable Polyether Electrolytes for Convenient and Low‐Cost Recycling of LiTFSI

Von Wiley-VCH zur Verfügung gestellt

A family of F-containing thermally depolymerizable polyethers were prepared as solid electrolytes, and with the help of the thermal degradation of polyethers, the LiTFSI was successfully reclaimed in high yields of 80 %, providing an example for the recycling of LiTFSI and benefiting the cost control of solid-state batteries.


Abstract

Solid polymer electrolytes (SPEs) with LiTFSI (lithium bis(trifluoromethane sulfonimide)) are promising candidates for solid-state batteries, owing to their good interfacial contact with solid electrodes. Here, three copolymerized polyethers were prepared as SPEs, using the catalysts of SnF2 or SnF2-LiPF6. The thermal depolymerization of these polyethers was observed at elevated temperatures, which limits their operating temperature ranges. Once the catalyst is removed, the thermal degradation temperatures of these SPEs are raised by 30–55 °C, together with improved thermal performance in cells. For SPEs, the high price of LiTFSI is an obstacle for their large-scale application, and it's recycling is hindered by the strong interaction with polymers. By the thermal depolymerization of polyethers, LiTFSI can be easier reclaimed from above mentioned SPEs and even the commercial PEO(poly(ethylene-oxide)) based SPE in rates of 70–80 %, providing a low-cost strategy for the recycling of LiTFSI.

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