Journal Article

FZJ-2021-01769

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Realizing poly(ethylene oxide) as a polymer for solid electrolytes in high voltage lithium batteries via simple modification of the cell setup

Stolz, L.FZJ* ; Homann, G.FZJ* ; Winter, M. (Corresponding author)FZJ* ; Kasnatscheew, J. (Corresponding author)FZJ*

2021
Royal Society of Chemistry Cambridge

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Please use a persistent id in citations: http://hdl.handle.net/2128/27841  doi:10.1039/D1MA00009H

Abstract: Pure, i.e., linear poly(ethylene oxide)-based solid polymer electrolyte (PEO-based SPE) as a common benchmark system for Li metal batteries (LMBs) is frequently assumed to be unsuitable for high voltage applications e.g., with LiNi0.6Mn0.2Co0.2O2 (NMC622)-based cathodes. In fact, a destructive failure appears immediately after cell operation, seen by a random-like “voltage noise” during charge, rendering continuous charge/discharge cycling in e.g., NMC622||Li cells not possible. Counterintuitively, this failure is a result of short-circuits in the course of e.g., Li dendrite penetration. It is shown that the distance between the electrodes plays a crucial role. This failure is more likely with a lower distance, particularly when the SPE is mechanically prone to shrinkage, for example at higher temperatures as systematically revealed by mechanical compression tests. Additionally, the active mass loading has a crucial impact on short circuits, and thus the “voltage noise” failure, as well. An effective and practically simple solution to realize cell operation with a PEO-based SPE is the incorporation of a spacer between the electrodes. This modification prevents the detrimental shrinkage and enables charge/discharge cycling performance in NMC622||Li cells with a defined and constant electrode distance, thus without voltage noise, and finally fulfills a reasonable benchmark for systematic R&D with specific capacities above 150 mA h g−1 even at 40 °C.

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Contributing Institute(s):

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

Research Program(s):

1. 121 - Photovoltaik und Windenergie (POF4-121) (POF4-121)

Appears in the scientific report 2021

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Database coverage:
; ; ; ; Article Processing Charges ; Clarivate Analytics Master Journal List ; DOAJ Seal ; Emerging Sources Citation Index ; Fees ; IF >= 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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