TY  - JOUR
AU  - Ghaur, Adjmal
AU  - Peschel, Christoph
AU  - Dienwiebel, Iris
AU  - Haneke, Lukas
AU  - Du, Leilei
AU  - Profanter, Laurin
AU  - Gomez-Martin, Aurora
AU  - Winter, Martin
AU  - Nowak, Sascha
AU  - Placke, Tobias
TI  - Effective SEI Formation via Phosphazene‐Based Electrolyte Additives for Stabilizing Silicon‐Based Lithium‐Ion Batteries (Adv. Energy Mater. 26/2023)
JO  - Advanced energy materials
VL  - 13
IS  - 26
SN  - 1614-6832
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2024-02565
SP  - 2370113
PY  - 2023
N1  - Unterstützt durch Projekte "GrEEn" (313-W044A), Horizon  2020  project  SeNSE  (grant  agreement  number  875548)
AB  - 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.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1002/aenm.202370113
UR  - https://juser.fz-juelich.de/record/1024915
ER  -