Performance of Polymer Electrolytes Based on Polyvinylidene Fluoride (PVDF) in Lithium-ion Batteries

Polyvinylidene fluoride (PVDF) is a semicrystalline polymer which has been extensivelyapplied in scientific research and industrial processes owing to its desirable featuressuch as excellent dielectric properties, suitable mechanical resistance, high thermal stability,good chemical resistance. PVDF membranes can be applied in a wide range of applicationsincluding waste water treatment, gas separation, and separator and polymer electrolyte inlithium ion batteries. PVDF-based polymer electrolytes in lithium ion batteries should havelow thickness as well as an appropriate porosity with good mechanical strength and highelectrochemical stability. Applying pristine PVDF based polymer electrolytes may causeinternal short circuit which will influence the performance of the Li-ion batteries. BlendingPVDF with other polymers and incorporation of inorganic fillers have been considered aseffective methods to improve the performance of PVDF-based electrolytes. In this paper,PVDF-based electrolytes and their performance requirements have been investigated. Thefabrication methods of PVDF membranes and the known strategies which are applied toimprove their mechanical and electrochemical characteristics have also been described.Furthermore, the ionic conductivity and electrochemical performance of PVDF-basedlithium-ion batteries are discussed.