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Versatile solid polymer electrolytes from clickable poly(glycidyl propargyl ether) for lithium metal batteries

Title data

Krimalowski, Alexander ; Rosenbach, Dominic ; Erabhoina, Hari Mohan ; Thelakkat, Mukundan:
Versatile solid polymer electrolytes from clickable poly(glycidyl propargyl ether) for lithium metal batteries.
In: Journal of Energy Storage. Vol. 65 (2023) . - 107348.
ISSN 2352-152X

Abstract in another language

We present three new graft copolymers for the application as solid polymer electrolytes (SPEs) in solvent-free, all solid-state lithium metal batteries (LMBs), based on the clickable poly (glycidyl propargyl ether) platform. These fully amorphous polymers consist of an all-ether polymer backbone and different additional Li+-coordinating oxo-functionalities - diester, carbonate and phosphate ester - in the attached sidechain. We aim to address the fundamental question on the influence of Li+-coordination in such doubly functionalized systems having competing Li+-coordination functional groups. We prepared polymer nanocomposite SPEs based on these novel polymers mixed with a highly-dissociating lithium salt (LiTFSI) and TiO2 nanofillers, which improve the electrolyte-electrode compatibility. We perform an extensive and comparative investigation in terms of physicochemical and electrochemical properties including ionic conductivity, lithium transference number, lithium plating and stripping as well as the fabrication and cycling of LMBs utilizing lithium iron phosphate (LFP) cathodes. Thermal characterization is coupled with temperature-dependent ionic conductivity measurements and detailed IR spectroscopy to understand the mechanistic properties and selectivity of the Li+ coordination and conduction. Two of the nanocomposite SPEs show efficient battery cycling with initial capacities of ca. 150 mAh g−1 and a capacity retention of ca. 70–80 % after 100 cycles.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Solid polymer electrolytes; Clickable PEO; Ionic conductivity; Polyimide membranes; FT-IR spectroscopy; eDRT; Li plating/stripping; Galvanostatic cycling; LiFePO4 batteries
Institutions of the University: Research Institutions > Central research institutes > Bayerisches Zentrum für Batterietechnik - BayBatt
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
Date Deposited: 05 Jun 2023 07:14
Last Modified: 05 Jun 2023 07:14