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Solid polymer electrolytes from polyesters with diester sidechains for lithium metal batteries

Title data

Rosenbach, Dominic ; Krimalowski, Alexander ; Erabhoina, Hari Mohan ; Thelakkat, Mukundan:
Solid polymer electrolytes from polyesters with diester sidechains for lithium metal batteries.
In: Journal of Materials Chemistry A. Vol. 10 (2022) Issue 16 . - pp. 8932-8947.
ISSN 2050-7496
DOI: https://doi.org/10.1039/d2ta00800a

Abstract in another language

A series of polymethacrylates and polyacrylates carrying diester sidechain moieties with varying alkyl spacer lengths are designed, synthesized, and evaluated as solid polymer electrolytes (SPEs) in lithium metal batteries (LMBs). These amorphous polymers with glass transition temperatures in the range of −58 to +32 °C are tested as SPEs in combination with LiTFSI or LiFSI. At an optimum salt concentration of 25 wt%, ionic conductivities up to 10−4 S cm−1 at 70 °C are achieved. These SPEs reveal high lithium transport numbers (0.5–0.7) and high electrochemical stability (5.4 V vs. Li/Li+) as determined by LSV. In combination with an ultrathin polyimide membrane and 10 wt% TiO2 nanoparticles, dendrite-free plating/stripping at 40 and 70 °C is realized in symmetrical Li|SPE|Li cells. Detailed extended distribution of relaxation times (eDRT) analysis of impedance measurements is employed for understanding the diverse cell processes. In solvent-free LMBs comprising a polyimide membrane soaked with the nanocomposite polyester electrolyte, lithium metal foil as the anode and an optimized LiFePO4 cathode, a very high initial specific discharge capacity of 152 mA h g− 1 (at 0.2C, 70 °C), excellent capacity retention of 94% after 100 cycles (at 1C, 70 °C) and negligible capacity fading even at 2C (96% retention after 300 cycles) are demonstrated. These novel polyester-based SPEs exhibit high cycling stability at 40 °C, making them highly attractive for room temperature applications.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I
Research Institutions > Research Centres > Bayerisches Zentrum für Batterietechnik - BayBatt
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 11 May 2022 07:20
Last Modified: 11 May 2022 07:20
URI: https://eref.uni-bayreuth.de/id/eprint/69547