A novel PVFM based membranes prepared via phase inversion method and its application in GPE
发表时间：2014-04-10 11:17
The polyvinyl acetal based polymer membranes are prepared via phase inversion method using polyvinyl
formal (PVFM) as the polymer matrix, N-methyl pyrrolidone (NMP) as the solvent, 4,40- diphenylmethane diisocyanate (MDI) as the chemical crosslinking agent and deionized water as the nonsolvent,
respectively. Three-dimensional network structure has been formed due to the polyurethane reaction
between the hydroxyl group of PVFM and MDI, which contributes to the chemical stability of PVFM
based membrane in LiFP6-based liquid electrolyte. The morphologies of the polymer membranes can be
controlled in thermodynamic isothermal process to access porous and dense membranes. The dense
membranes have good mechanical strength and thermal-resistant characteristics. The membranes
absorb and swell liquid electrolyte to form stable gel polymer electrolytes (GPEs) with ionic conductivity
of 1.77 104 S/cm at room temperature and wide electrochemical window of 1.8e5.0 V