Preparation And Electrochemical Performance Of PVDF Fiber Separator For Supercapacitor

Electrospinning is an effective techonology to produce nanofiber web,the nanofiber web is prepared with a nano-porous structure,the fiber diameter can be regulated on a micrometer or nanometer scale,by increasing the fiber surface area and porosity,they can be further improved electrospinning applications.They have potential applications in the supercapacitor electrode and the separator too.In this paper,electrospinning was used to prepare PVDF nanofibers battery separator and improve their structure and performance.Contents of this paper are as follows:Electrospinning preparation of polyvinylidene fluoride(PVDF),polystyrene(PS),polyacrylonitrile(PAN).Using three polymers which was dissolved in DMF to prepare precursor solution,then using electrospinning process and high-voltage D.C power supply to prepare nanofiber.in order to get the best spining process parameters.Then investigate the three materials as supercapacitor electrodes and electrochemical properties of the membrane stability.Thereby obtain the best material for the PVDF membrane electrodes,PVDF concentration at this time was 16%,the electrolyte uptake was 170%,the internal resistance was 5.5 ?.The preparing porous nanofibers of PVDF which prepared by the high voltage DC electrospinning method PVDF/PVP nanofibers.Then removing PVP by solution phase separation technique to obtain a porous PVDF nanofibers.Characterized by morphology and electrochemical performance results show that specific surface area of 16.602 m2/g,the electrolyte uptake was 300%,the internal resistance was 2.5 ?,the the voltage drop was 0.047 V.Preparation of PVDF electrospun porous hollow fiber membrane.Using PVDF/PVP solution as shells,using glycerol solution as the core,prepared by the DC high voltage electrospinning method nanofibers.then give porous hollow nanofiber by phase separation technique.By morphology and electrochemical characterization results showed that specific surface area of 60.648 m2/g,the electrolyte uptake was 450%,the internal resistance 1?,the voltage drop was 0.028 V.