Facile reduction of pseudo-carbonates: Promoting solid electrolyte interphases with dicyanoketene alkylene acetals in lithium-ion batteries
Artikel i vetenskaplig tidskrift, 2016

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 =C(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 degrees C. Moreover, the additives proved to enhance the thermal stability of the lithiated graphite/electrolyte interface, as deduced from DSC measurements.

SEI

vinyl ethylene carbonate

low-temperature performance

li-ion

density functionals

elevated-temperature

graphite anode

Li-ion battery

DFT

Thermal runaway

cells

additives

Dicyanoketene alkylene acetal

carbonate

Additives

fluoroethylene

thermal-stability

Författare

C. Forestier

CNRS RS2E FR3459

Université de Picardie Jules Verne

Institut National de l'Environnement Industriel et des Risques (INERIS)

Renault

Piotr Jankowski

Chalmers University of Technology

Politechnika Warszawska

L. Coser

CNRS RS2E FR3459

Université de Picardie Jules Verne

G. Gachot

CNRS RS2E FR3459

Université de Picardie Jules Verne

L. Sannier

Renault

Patrik Johansson

Chalmers, Fysik, Kondenserade materiens fysik

M. Armand

Université de Picardie Jules Verne

S. Grugeon

CNRS RS2E FR3459

Université de Picardie Jules Verne

S. Laruelle

CNRS RS2E FR3459

Université de Picardie Jules Verne

Journal of Power Sources

0378-7753 (ISSN)

Vol. 303 1-9

Styrkeområden

Transport

Energi

Materialvetenskap

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1016/j.jpowsour.2015.10.103