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Synthesis of an Original Fluorinated triethylene glycol methacrylate Monomer and its Radical Copolymerisation with Vinylidene Fluoride. Application as Polymer Electrolyte Gel for Li-Ion Batteries

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Alaaeddine, Ali Vergnaud, Jerome Rolland, Julien [UCL] Vlad, Alexandru [UCL] Gohy, Jean-François [UCL] Ameduri, Bruno

The synthesis and characterisation of novel poly[VDF-g-oligo(EO)] graft copolymers (where VDF and EO stand for vinylidene fluoride and ethylene oxide, respectively) are presented. First, 2-trifluoromethyl oligo(EO) acrylate, MAFTEG, was prepared by esterification of triethylene glycol monomethyl ether (TEG) with 2-trifluoromethacrylic acid (MAF) catalyzed by methanesulfonic acid, in 50% yields. Then, various radical copolymerisations of such MAFTEG with VDF from different feeds (VDF ranging from 86 to 95 mol.%) led to random poly[VDF-co-MAFTEG] copolymers that bore oligo(OE) side-chains in satisfactory yields (67%). These original graft copolymers were characterised by 1H, 19F and 13C NMR spectroscopy. Their molar masses reached 7,000 g∙mol-1 and their thermal properties were investigated while their glass transition temperatures ranged between -31 and -19 °C. Their thermogravimetric analyses under air showed decomposition temperatures from 235 to 325 °C with 10 % weight loss (Td,10%). Gel polymer electrolytes were achieved at room temperature by blending ionic liquid electrolyte (RTIL), poly[VDF-g-oligo(EO)] graft copolymers, and silica nanoparticles, the ionic liquid being made of 1-propyl-1-methyl pyrrolidinium bis(fluorosulfonyl)imide (PyrFSI) dissolving lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). These novel copolymers are of potential interest as gel polymer electrolytes in lithium ion batteries, showing competitive ambient conductivities of 0.2 mS.cm-1 that increased up to 0.5 mS.cm-1 with the content of silica nanoparticles at 20 wt%. In addition, the electrolyte gel appeared to be electrochemically stable in a wide range of potentials varying from 1.5 V to 4 V vs. Li+/Li, compatible with 4 V class lithium ion batteries.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2015
Language Anglais
Journal information "Polymer Chemistry" - Vol. 6, no. 33, p. 6021-6028 (2015)
Peer reviewed yes
Publisher Royal Society of Chemistry ((United Kingdom) Cambridge)
issn 1759-9954
e-issn 1759-9962
Publication status Publié
Affiliation UCL - SST/IMCN/BSMA - Bio and soft matter
Links
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Bibliographic reference Alaaeddine, Ali ; Vergnaud, Jerome ; Rolland, Julien ; Vlad, Alexandru ; Gohy, Jean-François ; et. al. Synthesis of an Original Fluorinated triethylene glycol methacrylate Monomer and its Radical Copolymerisation with Vinylidene Fluoride. Application as Polymer Electrolyte Gel for Li-Ion Batteries. In: Polymer Chemistry, Vol. 6, no. 33, p. 6021-6028 (2015)
Permanent URL http://hdl.handle.net/2078.1/162264