Journal Article

FZJ-2024-02577

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png An ionic liquid- and PEO-based ternary polymer electrolyte for lithium metal batteries: an advanced processing solvent-free approach for solid electrolyte processing

Herbers, L. ; Küpers, V. ; Winter, M. ; Bieker, P. (Corresponding author)FZJ*

2023
RSC Publishing London

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Please use a persistent id in citations: doi:10.1039/D3RA02488A  doi:10.34734/FZJ-2024-02577

Abstract: A processing solvent-free manufacturing process for cross-linked ternary solid polymer electrolytes (TSPEs) is presented. Ternary electrolytes (PEODA, Pyr14TFSI, LiTFSI) with high ionic conductivities of >1 mS cm−1 are obtained. It is shown that an increased LiTFSI content in the formulation (10 wt% to 30 wt%) decreases the risk of short-circuits by HSAL significantly. The practical areal capacity increases by more than a factor of 20 from 0.42 mA h cm−2 to 8.80 mA h cm−2 before a short-circuit occurs. With increasing Pyr14TFSI content, the temperature dependency of the ionic conductivity changes from Vogel–Fulcher–Tammann to Arrhenius behavior, leading to activation energies for the ion conduction of 0.23 eV. In addition, high Coulombic efficiencies of 93% in Cu‖Li cells and limiting current densities of 0.46 mA cm−2 in Li‖Li cells were obtained. Due to a temperature stability of >300 °C the electrolyte guarantees high safety in a broad window of conditions. In LFP‖Li cells, a high discharge capacity of 150 mA h g−1 after 100 cycles at 60 °C was achieved.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
2. BACCARA - Battery and superCapacitor ChARActerization and testing (608491) (608491)

Appears in the scientific report 2024

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