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001019323 1001_ $$0P:(DE-Juel1)190810$$aWeiling, Matthias$$b0
001019323 245__ $$aMechanistic Understanding of Additive Reductive Degradation and SEI Formation in High‐Voltage NMC811||SiO x ‐Containing Cells via Operando ATR‐FTIR Spectroscopy
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001019323 520__ $$aThe implementation of silicon (Si)-containing negative electrodes is widely discussed as an approach to increase the specific capacity of lithium-ion batteries. However, challenges caused by severe volume changes and continuous (re-)formation of the solid-electrolyte interphase (SEI) on Si need to be overcome. The volume changes lead to electrolyte consumption and active lithium loss, decaying the cell performance and cycle life. Herein, the additive 2 sulfobenzoic acid anhydride (2 SBA) is utilized as an SEI-forming electrolyte additive for SiOx-containing anodes. The addition of 2 SBA to a state-of-the-art carbonate-based electrolyte in high-voltage NMC811||AG+20% SiOx pouch cells leads to improved electrochemical performance, resulting in a doubled cell cycle life. The origin of the enhanced cell performance is mechanistically investigated by developing an advanced experimental technique based on operando attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy. The operando ATR-FTIR spectroscopy results elucidate the degradation mechanism via anhydride ring-opening reactions after electrochemical reduction on the anode surface. Additionally, ion chromatography conductivity detection mass spectrometry, scanning electron microscopy, energy dispersive X-ray analysis, and quantum chemistry calculations are employed to further elucidate the working mechanisms of the additive and its degradation products.
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001019323 536__ $$0G:(BMBF)13XP5129$$aElektrolytformulierungen für Lithiumbatterien der nächsten Generation mit großer Energiedichte und hoher Beständigkeit (13XP5129)$$c13XP5129$$x1
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001019323 7001_ $$0P:(DE-HGF)0$$aLechtenfeld, Christian$$b1
001019323 7001_ $$0P:(DE-Juel1)188450$$aPfeiffer, Felix$$b2
001019323 7001_ $$0P:(DE-HGF)0$$aFrankenstein, Lars$$b3
001019323 7001_ $$0P:(DE-Juel1)169877$$aDiddens, Diddo$$b4
001019323 7001_ $$0P:(DE-Juel1)199048$$aWang, Jian-Fen$$b5$$ufzj
001019323 7001_ $$0P:(DE-HGF)0$$aNowak, Sascha$$b6
001019323 7001_ $$00000-0002-2754-6623$$aBaghernejad, Masoud$$b7$$eCorresponding author
001019323 773__ $$0PERI:(DE-600)2594556-7$$a10.1002/aenm.202303568$$gp. 2303568$$n5$$p2303568$$tAdvanced energy materials$$v14$$x1614-6832$$y2024
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