Facile reduction of pseudo-carbonates: promoting solid electrolyte interphases with dicyanoketene alkylene acetals in lithium-ion batteries

Coralie Forestier , Piotr Jankowski , Laura Coser , Gregory Gachot , Lucas Sannier , Patrik Johansson , Michel Armand , Sylvie Grugeon , Stephane Laruelle

Abstract

Dicyanoketene ethylene and propylene acetals, DCKEA and DCKPA respectively, have been investigated as electrolyte additives for Li-ion batteries. The purpose was to assess the changes in reduction behaviour and solid electrolyte interphase (SEI) passivation properties upon replacing the carbonyl group of ethylene carbonate (EC) and propylene carbonate (PC) solvents, respectively, by the slightly more electronegative and highly conjugated double bond; length as m-dashC(CN)2 group. The experimental reduction potentials and the IR spectroscopy characterisation efforts were further supported by density functional theory (DFT) computations. The two additives were found to, in relatively small amount (0.5 wt%), provide beneficial effects on the capacity retention of 8 mAh cells cycled at 20 and 45 °C. Moreover, the additives proved to enhance the thermal stability of the lithiated graphite/electrolyte interface, as deduced from DSC measurements.
Author Coralie Forestier
Coralie Forestier,,
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, Piotr Jankowski KChNTCS
Piotr Jankowski,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Laura Coser
Laura Coser,,
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, Gregory Gachot
Gregory Gachot,,
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, Lucas Sannier
Lucas Sannier,,
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, Patrik Johansson
Patrik Johansson,,
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, Michel Armand
Michel Armand,,
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, Sylvie Grugeon
Sylvie Grugeon,,
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, Stephane Laruelle
Stephane Laruelle,,
-
Journal seriesJournal of Power Sources, ISSN 0378-7753
Issue year2016
Vol303
Pages1-9
Publication size in sheets0.5
Keywords in EnglishLi-ion battery; SEI; Additives; Thermal runaway; DFT; Dicyanoketene alkylene acetal
DOIDOI:10.1016/j.jpowsour.2015.10.103
URL http://www.sciencedirect.com/science/article/pii/S0378775315304900
Languageen angielski
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1-s2.0-S0378775315304900-main.pdf (file archived - login or check accessibility on faculty) 1-s2.0-S0378775315304900-main.pdf 1.71 MB
Score (nominal)45
ScoreMinisterial score = 40.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 45.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 6.395 (2) - 2016=6.117 (5)
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