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001025198 245__ $$aEffective SEI Formation via Phosphazene‐Based Electrolyte Additives for Stabilizing Silicon‐Based Lithium‐Ion Batteries
001025198 260__ $$aWeinheim$$bWiley-VCH$$c2023
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001025198 520__ $$aSilicon, as potential next-generation anode material for high-energy lithium-ion batteries (LIBs), suffers from substantial volume changes during (dis)charging, resulting in continuous breakage and (re-)formation of the solid electrolyte interphase (SEI), as well as from consumption of electrolyte and active lithium, which negatively impacts long-term performance and prevents silicon-rich anodes from practical application. In this work, fluorinated phosphazene compounds are investigated as electrolyte additives concerning their SEI-forming ability for boosting the performance of silicon oxide (SiOx)-based LIB cells. In detail, the electrochemical performance of NCM523 || SiOx/C pouch cells is studied, in combination with analyses regarding gas evolution properties, post-mortem morphological changes of the anode electrode and the SEI, as well as possible electrolyte degradation. Introducing the dual-additive approach in state-of-the-art electrolytes leads to synergistic effects between fluoroethylene carbonate and hexafluorocyclotriphosphazene-derivatives (HFPN), as well as enhanced electrochemical performance. The formation of a more effective SEI and increased electrolyte stabilization improves lifetime and results in an overall lower cell impedance. Furthermore, gas chromatography-mass spectrometry measurements of the aged electrolyte with HFPN-derivatives as an additive compound show suppressed ethylene carbonate and ethyl methyl carbonate decomposition, as well as reduced trans-esterification and oligomerization products in the aged electrolyte.
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001025198 536__ $$0G:(EU-Grant)875548$$aSeNSE - Lithium-ion battery with silicon anode, nickel-rich cathode and in-cell sensor for electric vehicles (875548)$$c875548$$fH2020-LC-BAT-2019$$x1
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001025198 7001_ $$aPeschel, Christoph$$b1
001025198 7001_ $$aDienwiebel, Iris$$b2
001025198 7001_ $$aHaneke, Lukas$$b3
001025198 7001_ $$aDu, Leilei$$b4
001025198 7001_ $$aProfanter, Laurin$$b5
001025198 7001_ $$00000-0001-7053-3986$$aGomez-Martin, Aurora$$b6
001025198 7001_ $$0P:(DE-Juel1)166130$$aWinter, Martin$$b7
001025198 7001_ $$00000-0003-1508-6073$$aNowak, Sascha$$b8
001025198 7001_ $$00000-0002-2097-5193$$aPlacke, Tobias$$b9$$eCorresponding author
001025198 773__ $$0PERI:(DE-600)2594556-7$$a10.1002/aenm.202203503$$gVol. 13, no. 26, p. 2203503$$n26$$p2203503$$tAdvanced energy materials$$v13$$x1614-6832$$y2023
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