A hard X-ray photoelectron spectroscopy study on the solid electrolyte interphase of a lithium 4,5-dicyano-2-(trifluoromethyl)imidazolide based electrolyte for Si-electrodes

Fredrik Lindgren , Chao Xu , Julia Maibach , Anna M. Andersson , Marek Marcinek , Leszek Niedzicki , Torbjörn Gustafsson , Fredrik Björefors , Kristina Edström

Abstract

This report focuses on the relatively new salt, lithium 4,5-dicyano-2-(trifluoromethyl)imidazolide (LiTDI), and its functionality together with a silicon based composite electrode in a half-cell lithium ion battery context. LiTDI is a promising alternative to the commonly used LiPF6 salt because it does not form HF which can decompose the oxide layer on Si. The formation of a solid electrolyte interphase (SEI) as well as the development of the active Si-particles are investigated during the first electrochemical lithiation and de-lithiation. Characterizations are carried out at different state of charge with scanning electron microscopy (SEM) as well as hard x-ray photoelectron spectroscopy (HAXPES) at two different photon energies. This enables a depth resolved picture of the reaction processes and gives an idea of the chemical buildup of the SEI. The SEI is formed by solvent and LiTDI decomposition products and its composition is similar to SEI formed by other carbonate based electrolytes. The LiTDI salt or its decomposition products are not in itself reactive towards the active Si-material and no unwanted side reactions occurs with the active Si-particles. Despite some decomposition of the LiTDI salt, it is a promising alternative for electrolytes aimed towards Si-based electrodes.
Author Fredrik Lindgren
Fredrik Lindgren,,
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, Chao Xu
Chao Xu,,
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, Julia Maibach
Julia Maibach,,
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, Anna M. Andersson
Anna M. Andersson,,
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, Marek Marcinek KChNTCS
Marek Marcinek,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Leszek Niedzicki KChNTCS
Leszek Niedzicki,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Torbjörn Gustafsson
Torbjörn Gustafsson,,
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, Fredrik Björefors
Fredrik Björefors,,
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, Kristina Edström
Kristina Edström,,
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Journal seriesJournal of Power Sources, ISSN 0378-7753
Issue year2016
Vol301
Pages105-112
Publication size in sheets0.5
Keywords in EnglishLithium 4,5-dicyano-2-(trifluoromethyl)imidazolide; Silicon negative electrode; Solid electrolyte interphase; Hard x-ray photoelectron spectroscopy
DOIDOI:10.1016/j.jpowsour.2015.09.112
URL http://www.sciencedirect.com/science/article/pii/S0378775315303724
Languageen angielski
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1-s2.0-S0378775315303724-main.pdf 904.54 KB
Score (nominal)45
ScoreMinisterial score [Punktacja MNiSW] = 40.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) [Punktacja MNiSW (2013-2016)] = 45.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor [Impact Factor WoS]: 2016 = 6.395 (2) - 2016=6.117 (5)
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