Journal Article

FZJ-2024-00433

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Blended Salt Electrolyte Design for Enhanced NMC811||Graphite Cell Performance

Yan, P.FZJ* ; Shevchuk, M. ; Wölke, C.FZJ* ; Pfeiffer, F.FZJ* ; Berghus, D. ; Baghernejad, M. ; Röschenthaler, G.-V. ; Winter, M.FZJ* ; Cekic-Laskovic, I. (Corresponding author)FZJ*

2024
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/sstr.202300425  doi:10.34734/FZJ-2024-00433

Abstract: The high energy density, nickel-rich layered cathode material LiNi0.8Mn0.1Co0.1O2(NMC811) is recognized as a promising candidate for next-generation batterychemistries. However, due to their structural and interfacial instability, nickel-richNMC cathodes still face a number of challenges in practical application. For thisreason, the design and development of novel electrolyte formulations, able tostabilize the nickel-rich cathode|electrolyte interface, are highly demanded. In thiswork, a novel electrolyte is developed using lithium (difluoromethanesulfonyl)(trifluoromethanesulfonyl)imide (LiDFTFSI) and lithium hexafluorophosphate(LiPF6) as salt blend in an organic carbonate-solvent based solvent mixture. Thepresence of LiDFTFSI notably enhances the electrochemical performance of theresulting NMC811||graphite cells. Further advancement of the considered cellchemistry is achieved by introducing the well-known functional electrolyteadditive vinylene carbonate (VC), which was found to feature a synergistic effectwith LiDFTFSI. The formation of a homogenous, effective, and robust solidelectrolyte interphase (SEI) as well as cathode electrolyte interphase (CEI) on thecorresponding electrodes resulted in superior electrochemical performance.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
2. BIG-MAP - Battery Interface Genome - Materials Acceleration Platform (957189) (957189)
3. BATTERY 2030PLUS - BATTERY 2030+ large-scale research initiative: At the heart of a connected green society (957213) (957213)

Appears in the scientific report 2024

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Database coverage:
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