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000903576 1001_ $$0P:(DE-HGF)0$$aKlein, Sven$$b0
000903576 245__ $$aUnderstanding the Role of Commercial Separators and Their Reactivity toward LiPF 6 on the Failure Mechanism of High‐Voltage NCM523 || Graphite Lithium Ion Cells
000903576 260__ $$aWeinheim$$bWiley-VCH$$c2022
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000903576 520__ $$aNCM523 || graphite lithium ion cells operated at 4.5 V are prone to an early “rollover” failure, due to electrode cross-talk, that is, transition metal (TM = Mn, Ni, and Co) dissolution from NCM523 and deposition at graphite, subsequent formation of Li metal dendrites, and, in the worst case, generation of (micro-)short-circuits by dendrites growing to the cathode. Here, the impact of different separators on the high-voltage performance of NCM523 || graphite cells is elucidated focusing on the separators’ structural properties (e.g., membrane vs fiber) and their reactivity toward LiPF6 (e.g., ceramic-coated separators). First, the separator architecture has a major impact on cycle life. Fiber-structured separators can prevent the “rollover” failure by a more homogeneous deposition of TMs and formation of Li metal dendrites, thus, hindering penetration of dendrites to the cathode. In contrast, porous membrane-structured separators cannot prevent the cell failure due to inhomogeneous TM deposits/Li metal dendrites. Second, it is demonstrated that different types of ceramic-coated separators (Boehmite (γ-AlO(OH)) vs α-Al2O3) exhibit different reactivities toward LiPF6. While α-Al2O3 shows a minor reactivity toward LiPF6, the γ-AlO(OH) coating leads to in situ formation of the beneficial difluorophosphate anion in high amounts due the high reactivity toward LiPF6 decomposition, which significantly improves cycle life.
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000903576 7001_ $$0P:(DE-HGF)0$$aWrogemann, Jens Matthies$$b1
000903576 7001_ $$0P:(DE-HGF)0$$avan Wickeren, Stefan$$b2
000903576 7001_ $$0P:(DE-HGF)0$$aHarte, Patrick$$b3
000903576 7001_ $$0P:(DE-HGF)0$$aBärmann, Peer$$b4
000903576 7001_ $$0P:(DE-HGF)0$$aHeidrich, Bastian$$b5
000903576 7001_ $$0P:(DE-HGF)0$$aHesper, Jakob$$b6
000903576 7001_ $$0P:(DE-Juel1)171270$$aBorzutzki, Kristina$$b7$$ufzj
000903576 7001_ $$0P:(DE-HGF)0$$aNowak, Sascha$$b8
000903576 7001_ $$0P:(DE-HGF)0$$aBörner, Markus$$b9
000903576 7001_ $$0P:(DE-Juel1)166130$$aWinter, Martin$$b10$$ufzj
000903576 7001_ $$0P:(DE-Juel1)171865$$aKasnatscheew, Johannes$$b11$$eCorresponding author$$ufzj
000903576 7001_ $$00000-0002-2097-5193$$aPlacke, Tobias$$b12$$eCorresponding author
000903576 773__ $$0PERI:(DE-600)2594556-7$$a10.1002/aenm.202102599$$gp. 2102599 -$$n2$$p2102599 -$$tAdvanced energy materials$$v12$$x1614-6832$$y2022
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