Towards a better understanding of vinylene carbonate derived SEI-layers by synthesis of reduction compounds
Artikel i vetenskaplig tidskrift, 2019

Here two chemical reduction pathways to synthesize the vinylene carbonate (VC)and poly(VC)reduction products are investigated, with the precise aim of further deciphering the lithium-ion battery solid electrolyte interphase (SEI)layer composition and the associated reduction mechanisms. The liquid synthesis pathway offers the opportunity of varying the concentration of Li-4,4′-Di-tert-butylbiphenyl reducing agent, whereas the dry synthesis pathway by ball milling allows to solve issues related to solvent-induced side reactions and washing procedure. As a result, the two syntheses do not unveil the same reduction mechanisms, favouring either carboxylate or carbonate salts as the major end product. The latter pathway is very efficient in terms of providing SEI-layers products resulting in well-defined IR spectra and comparisons with simulated spectra enable us to obtain IR fingerprints of the Li di-vinylene di-carbonate (LDVD)compound. Taken together the synthesis procedures provide information on conditions favouring radical polymerization and further poly(VC)reduction into Li 2 CO 3 and polyacetylene. Overall, this chemical simulation of SEI-layers formation assists in a proper characterization of the SEI-layers created on graphite surfaces by their IR spectra showing that Li 2 CO 3 , LDVD and poly(VC)are all present in different proportions dependent on the VC content in the electrolyte.

Li-ion battery

IR

SEI

Ball milling

Vinylene carbonate

Additive

Författare

S. Grugeon

Centre national de la recherche scientifique (CNRS)

Université de Picardie Jules Verne

Piotr Jankowski

Politechnika Warszawska

Chalmers, Fysik, Kondenserade materiens fysik

Centre national de la recherche scientifique (CNRS)

Dominique Cailleu

Université de Picardie Jules Verne

C. Forestier

Centre national de la recherche scientifique (CNRS)

Université de Picardie Jules Verne

Renault

L. Sannier

Centre national de la recherche scientifique (CNRS)

Renault

Michel Armand

Université de Picardie Jules Verne

Patrik Johansson

Centre national de la recherche scientifique (CNRS)

Chalmers, Fysik, Kondenserade materiens fysik

S. Laruelle

Université de Picardie Jules Verne

Centre national de la recherche scientifique (CNRS)

Journal of Power Sources

0378-7753 (ISSN)

Vol. 427 77-84

Ämneskategorier

Oorganisk kemi

Materialkemi

Annan kemi

DOI

10.1016/j.jpowsour.2019.04.061

Mer information

Senast uppdaterat

2019-05-13