%0 Journal Article
%A Ghaur, Adjmal
%A Peschel, Christoph
%A Dienwiebel, Iris
%A Haneke, Lukas
%A Du, Leilei
%A Profanter, Laurin
%A Gomez-Martin, Aurora
%A Winter, Martin
%A Nowak, Sascha
%A Placke, Tobias
%T Effective SEI Formation via Phosphazene‐Based Electrolyte Additives for Stabilizing Silicon‐Based Lithium‐Ion Batteries (Adv. Energy Mater. 26/2023)
%J Advanced energy materials
%V 13
%N 26
%@ 1614-6832
%C Weinheim
%I Wiley-VCH
%M FZJ-2024-02565
%P 2370113
%D 2023
%Z Unterstützt durch Projekte "GrEEn" (313-W044A), Horizon  2020  project  SeNSE  (grant  agreement  number  875548)
%X Silicon, 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1002/aenm.202370113
%U https://juser.fz-juelich.de/record/1024915