Synthesis by UV-curing and characterisation of polyurethane acrylate-lithium salts-based polymer electrolytes in lithium batteries

Abstract

UV-cured caprolactone-based polyurethane acrylate (PUA) polymer blend electrolytes were prepared and characterised. To develop polymer electrolytes suited to ambient temperature, an ionically-conductive and reliable polymer electrolyte based on urethane acrylate resins synthesised from a fluorine-containing di-functional oligomer 6F ethoxylated diacrylate, a di-functional reactive diluent 1,6-hexanediol diacrylate for adjusting the viscosity, and a radical photo-initiator doped with a mixture of lithium salts were used. Free-standing flexible electrolyte films were prepared by UV-curing via free-radical photopolymerisation. The performance of the lithium polymer cell system (Li/PE(F4)/LiCoO2) was determined by electrochemical impedance spectroscopy, cyclic voltammetry, a galvanostatic recurrent differential pulse, chronocoulometry and chronoamperometry. The electrolyte with optimal amounts of fluorine-containing oligomer and optimal salt mixture content exhibited enhanced conductivity, showing a conductivity of 1.00 × 10 −4 S cm −1 at ambient temperature. The specific capacity, specific energy and specific power of a Li/PE(F4)/LiCoO2 cell were also determined.

UV-Cured Poly(Siloxane-Urethane)-Based Polymer Composite Materials for Lithium Ion Batteries—The Effect of Modification with Ionic Liquids

“…Various UV-cured crosslinked gel polymer electrolytes have been studied so far, primarily including polymerized di-or triacrylate or di-or trimethacrylate esters of PEO with doped lithium salts [3][4][5][6][7][8][9][10][11]. Similar systems based on UV-crosslinked siloxane diacrylate monomers [12,13] or polyurethane-acrylate [14,15] have also been investigated. However, in most of these works, flammable solvents were used, including mainly ethylene carbonate (EC), propylene carbonate (PC), or a standard flammable 1/2 v/v mixture of EC with dimethyl carbonate (DMC) referred to as EC/DMC in this paper.…”

UV-Cured polypropylene mesh-reinforced composite polymer electrolyte membranes

“…Appetecchi et al (28) reported that the liquid phase decomposed at the surface of the lithium, thereby severely affecting the electrochemical performance, such as the cyclability of the lithium electrode. Thus, the high stability of the composite polymer electrolytes (CPEs) may be due to the absence of any impurities, which is a welcome feature because it permits their use in highvoltage battery applications (29). The flat plateu in Figure 8 with no peaks in the 3.5-4.7-V voltage range confirms the high purity of the prepared composite polymer electrolyte.…”

Synthesis of cardanol-based photo-active SET-LRP initiator and its application to preparation of UV-cured resin

“…This approach is preferable to thermal curing in terms of energy saving, safety, high reaction rate, and has found a wide range of industrial applications such as coatings, oil inks, adhesives, dental materials (Ugur et al, 2014;Cheng et al, 2014b;Lee et al, 2011;Yang et al, 2010). However, smallmolecular photo-initiators are usually applied to the UV-curing process and these possess disadvantages such as ready volatility and motion which increase the hazards for workers and affect the properties of the resins.…”