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000890500 1001_ $$0P:(DE-HGF)0$$aKlein, Sven$$b0
000890500 245__ $$aExploiting the Degradation Mechanism of NCM523Graphite Lithium‐Ion Full Cells Operated at High Voltage
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000890500 520__ $$aLayered oxides, particularly including Li[NixCoyMnz]O2 (NCMxyz) materials, such as NCM523, are the most promising cathode materials for high‐energy lithium‐ion batteries (LIBs). One major strategy to increase the energy density of LIBs is to expand the cell voltage (>4.3 V). However, high‐voltage NCMurn:x-wiley:18645631:media:cssc202002113:cssc202002113-math-0002 graphite full cells typically suffer from drastic capacity fading, often referred to as “rollover” failure. In this study, the underlying degradation mechanisms responsible for failure of NCM523urn:x-wiley:18645631:media:cssc202002113:cssc202002113-math-0003 graphite full cells operated at 4.5 V are unraveled by a comprehensive study including the variation of different electrode and cell parameters. It is found that the “rollover” failure after around 50 cycles can be attributed to severe solid electrolyte interphase growth, owing to formation of thick deposits at the graphite anode surface through deposition of transition metals migrating from the cathode to the anode. These deposits induce the formation of Li metal dendrites, which, in the worst cases, result in a “rollover” failure owing to the generation of (micro‐) short circuits. Finally, approaches to overcome this dramatic failure mechanism are presented, for example, by use of single‐crystal NCM523 materials, showing no “rollover” failure even after 200 cycles. The suppression of cross‐talk phenomena in high‐voltage LIB cells is of utmost importance for achieving high cycling stability.
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000890500 7001_ $$0P:(DE-HGF)0$$aBärmann, Peer$$b1
000890500 7001_ $$0P:(DE-Juel1)171310$$aBeuse, Thomas$$b2
000890500 7001_ $$0P:(DE-Juel1)171270$$aBorzutzki, Kristina$$b3$$ufzj
000890500 7001_ $$0P:(DE-HGF)0$$aFrerichs, Joop Enno$$b4
000890500 7001_ $$0P:(DE-Juel1)171865$$aKasnatscheew, Johannes$$b5$$ufzj
000890500 7001_ $$0P:(DE-Juel1)166130$$aWinter, Martin$$b6$$eCorresponding author
000890500 7001_ $$00000-0002-2097-5193$$aPlacke, Tobias$$b7$$eCorresponding author
000890500 773__ $$0PERI:(DE-600)2411405-4$$a10.1002/cssc.202002113$$gVol. 14, no. 2, p. 595 - 613$$n2$$p595 - 613$$tChemSusChem$$v14$$x1864-564X$$y2021
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