Towards a better understanding of vinylene carbonate derived SEI-layers by synthesis of reduction compounds

JOURNAL OF POWER SOURCES

卷:427

Article

Grugeon, Sylvie^1,2  Jankowski, Piotr^4,5,7  Cailleu, Dominique³  Forestier, Coralie^1,2,6,7  Sannier, Lucas^2,6,7  Armand, Michel¹  Johansson, Patrik^5,7  Laruelle, Stephane^1,2 

[1] Univ Picardie Jules Verne, CNRS, UMR 7314, Lab Reactivite & Chim Solides, 33 Rue St Leu, F-80039 Amiens, France

[2] CNRS, RS2E, FR3459, Paris, France

[3] Univ Picardie Jules Verne, Plate Forme Analyt, 33 Rue St Leu, F-80039 Amiens, France

[4] Warsaw Univ Technol, Fac Chem, Ul Noakowskieg 3, PL-00664 Warsaw, Poland

[5] Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden

[6] Renault, DEA IREB, Technoctr, 1 Ave Golf, F-78288 Guyancourt, France

[7] CNRS, FR 3104, ALISTORE ERI European Res Inst, Hub Energie, Rue Baudelocque, F-80039 Amiens, France

关键词: Li-ion battery;    SET;    Additive;    Vinylene carbonate;    Ball milling;    IR;   

DOI  :  10.1016/j.jpowsour.2019.04.061

来源: Elsevier

【 摘 要 】

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 Li2CO3 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 Li2CO3, LDVD and poly (VC) are all present in different proportions dependent on the VC content in the electrolyte.

【 授权许可】

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