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001024915 1001_ $$0P:(DE-HGF)0$$aGhaur, Adjmal$$b0$$eCorresponding author
001024915 245__ $$aEffective SEI Formation via Phosphazene‐Based Electrolyte Additives for Stabilizing Silicon‐Based Lithium‐Ion Batteries (Adv. Energy Mater. 26/2023)
001024915 260__ $$aWeinheim$$bWiley-VCH$$c2023
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001024915 500__ $$aUnterstützt durch Projekte "GrEEn" (313-W044A), Horizon  2020  project  SeNSE  (grant  agreement  number  875548)
001024915 520__ $$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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001024915 7001_ $$0P:(DE-HGF)0$$aPeschel, Christoph$$b1
001024915 7001_ $$0P:(DE-HGF)0$$aDienwiebel, Iris$$b2
001024915 7001_ $$0P:(DE-HGF)0$$aHaneke, Lukas$$b3
001024915 7001_ $$0P:(DE-HGF)0$$aDu, Leilei$$b4
001024915 7001_ $$0P:(DE-HGF)0$$aProfanter, Laurin$$b5
001024915 7001_ $$0P:(DE-HGF)0$$aGomez-Martin, Aurora$$b6
001024915 7001_ $$0P:(DE-Juel1)166130$$aWinter, Martin$$b7$$ufzj
001024915 7001_ $$0P:(DE-HGF)0$$aNowak, Sascha$$b8
001024915 7001_ $$0P:(DE-HGF)0$$aPlacke, Tobias$$b9
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