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000891849 1001_ $$0P:(DE-Juel1)181055$$aStolz, Lukas$$b0$$ufzj
000891849 245__ $$aRealizing poly(ethylene oxide) as a polymer for solid electrolytes in high voltage lithium batteries via simple modification of the cell setup
000891849 260__ $$aCambridge$$bRoyal Society of Chemistry$$c2021
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000891849 520__ $$aPure, i.e., linear poly(ethylene oxide)-based solid polymer electrolyte (PEO-based SPE) as a common benchmark system for Li metal batteries (LMBs) is frequently assumed to be unsuitable for high voltage applications e.g., with LiNi0.6Mn0.2Co0.2O2 (NMC622)-based cathodes. In fact, a destructive failure appears immediately after cell operation, seen by a random-like “voltage noise” during charge, rendering continuous charge/discharge cycling in e.g., NMC622||Li cells not possible. Counterintuitively, this failure is a result of short-circuits in the course of e.g., Li dendrite penetration. It is shown that the distance between the electrodes plays a crucial role. This failure is more likely with a lower distance, particularly when the SPE is mechanically prone to shrinkage, for example at higher temperatures as systematically revealed by mechanical compression tests. Additionally, the active mass loading has a crucial impact on short circuits, and thus the “voltage noise” failure, as well. An effective and practically simple solution to realize cell operation with a PEO-based SPE is the incorporation of a spacer between the electrodes. This modification prevents the detrimental shrinkage and enables charge/discharge cycling performance in NMC622||Li cells with a defined and constant electrode distance, thus without voltage noise, and finally fulfills a reasonable benchmark for systematic R&D with specific capacities above 150 mA h g−1 even at 40 °C.
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000891849 7001_ $$0P:(DE-Juel1)169878$$aHomann, Gerrit$$b1
000891849 7001_ $$0P:(DE-Juel1)166130$$aWinter, Martin$$b2$$eCorresponding author$$ufzj
000891849 7001_ $$0P:(DE-Juel1)171865$$aKasnatscheew, Johannes$$b3$$eCorresponding author
000891849 773__ $$0PERI:(DE-600)3031236-X$$a10.1039/D1MA00009H$$gVol. 2, no. 10, p. 3251 - 3256$$n10$$p3251-3256$$tMaterials advances$$v2$$x2633-5409$$y2021
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