Study On Preparation And Properties Of PAMPS Matrix Composite Gel Polyelectrolyte

Gel-polymer electrolytes ?GPEs? with the advantages of compactness, reliability and freedom from leakage have attracted increasing attention for rechargeable batterie,electrochromic displays,supercapacitors and especially for flexible energy storage device. GPEs always exhibit high conductivity in the ranging between 10-4 and 10-3 S/cm. Comparing with GPEs which absorbing organic solvent, hydrogel polyelectrolytes have better prospect for its lower cost and environmental friendliness.Here, composite gel polyelectrolytes were prepared where Poly ?2-acrylamide-2-methyl propane sulfonic acid? ?PAMPS? worked as matrix and montmorillonite ?Na-MMT?worked as doped material. The influence of adding polyvinyl alcohol ?PVA? into the composite gel polyelectrolyte was also discussed to improve its ionic conductivity and mechanical property to work well in supercapacitor as electrolyte.PAMPS/MMT composite gel polyelectrolytes were prepared by solution castingmethod and the optimal ratio of initiator KPS, crosslinker MBA and doped material Na-MMT were explored. The ionic conductivity and mechanical strength of PAMPS GPE were successfully improved by adding Na-MMT into the system, the highest ionic conductivity is 5.91 ×10^-2 S/cm and tensile strength is 8.3MPa when Na-MMT is at 5?7wt.%. These composites were characterized via FTIR,XRD,and the results show that the layer structure of Na-MMT was exfoliated by PAMPS matrix successfully.TGA shows that the thermal stability of PAMPS/MMT is higher than that of PAMPS.The electrochemical properties were also studied, the electrode specific capacitance value of the supercapacitor based on PAMPS/MMTcomposite gel poly electrolyte is 22 F/g,which is higher than 20 F/g of PAMPS gel polyelectrolyte, the specific capacitance retention rate of the former is 90% after .1000 times charging and discharging,while the value of later is lower than 70%.PAMPS/PVA/MMT semi-interpenetrating Polymer Network ?s-IPN? composite GPEs were prepared by solution casting method and the optimal ratio of initiator KPS,crosslinker MBA, doped material Na-MMT and PVA/AMPS were explored. The adding of PVA and Na-MMT improved the ionic conductivity and mechanical strength of PAMPS/PVA s-IPN GPE and PAMPS/MMTcomposite GPE. PAMPS/PVA/MMT s-IPN composite GPEs have the highest ionic conductivity of 6.4×10^-2 S/cm and tensile strength of 24.3MPa when the ratio of PVA/AMPS is at 0.8:1 and Na-MMT is at 7wt.%,respectively. These composites were characterized via FTIR and XRD, and the results show that the polymer structure of PAMPS/PVA is semi-Interpenetrating Network and the layer structure of Na-MMT was exfoliated by PAMPS/PVA s-IPN matrix successfully. TGA shows that the thermal stability of PAMPS/PVA/MMT s-IPN is higher than that of PAMPS/PVA s-IPN. The electrochemical properties were also studied,the electrode specific capacitance value of the supercapacitor based on PAMPS/PVA/MMT s-IPN composite GPE is 24 F/g, which is higher than 21 F/g of PAMPS/PVA s-IPN GPE, the specific capacitance retention rate of the former is 91%after 1000 times charging and discharging,while the value of later is only 72%.