Abstract
Different weight percentages of ZrO2 (0, 3, 5, 7 and 10 wt%) incorporated electrospun PVDF-HFP nanocomposite polymer membranes (esCPMs) were prepared by electrospinning technique. They were activated by soaking in 1 M LiPF6 containing 1:1 volume ratio of EC : DMC (ethylene carbonate:dimethyl carbonate) to get electrospun nanocomposite polymer membrane electrolytes (esCPMEs). The influence of ZrO2 on the physical, mechanical and electrochemical properties of esCPM was studied in detail. Finally, coin type Li-ion capacitor cell was assembled using LiCo0.2Mn1.8O4 as the cathode, Activated carbon as the anode and the esCPME containing 7 wt% of ZrO2 as the separator, which delivered a discharge capacitance of 182.5 Fg−1 at the current density of 1Ag−1 and retained 92% of its initial discharge capacitance even after 2,000 cycles. It revealed that the electrospun PVdF-HFP/ZrO2 based nanocomposite membrane electrolyte could be used as a good candidate for high performance Li-ion capacitors.
Highlights
Polymer electrolytes are promising alternative to the conventional liquid electrolytes, as they overcome the problems caused by liquid electrolytes such as leakage that are deteriorating the long term performance of Li-ion capacitors as well as it can be form in any possible shapes[1]
It can be seen that ZrO2 nanoparticles were dispersed homogeneously in polyvinylidene fluoride (PVdF)-HFP matrix that may be due to good compatibility between the ZrO2 nanoparticles and the polymer
PVdF-HFP based electrospun nanocomposite polymer membrane electrolyte has been prepared by incorporating different weight percentages (0, 3, 5, 7 and 10 wt %) of ZrO2 nanoparticles
Summary
Polymer electrolytes are promising alternative to the conventional liquid electrolytes, as they overcome the problems caused by liquid electrolytes such as leakage that are deteriorating the long term performance of Li-ion capacitors as well as it can be form in any possible shapes[1]. Great efforts has been made on developing nanocomposite polymer membrane electrolytes, in order to improve the ionic conductivity, mechanical strength, stiffness, dimensional stability, thermal stability, electrochemical stability and good electrode-electrolyte contact. A majority of studies on PVdF-HFP based nanocomposite polymer electrolytes were reported for lithium-ion battery applications because of their excellent ionic conductivity, electrochemical stability and mechanical strength etc., The effect of zirconia fillers on the structural, mechanical, thermal and electrochemical properties of the polymer electrolytes such as polyvinyl alcohol (PVC), poly (ethylene oxide) (PEO), etc., have been reported earlier[4,5,6,7]. The development of electrospun PVdF-HFP/ZrO2 nanocomposite polymer membrane for Li-ion capacitors is of great importance. The supercapacitive performance of LiCo0.2Mn1.8O4//Carbon Li-ion capacitor cell assembled with the prepared electrospun PVdF-HFP/ ZrO2 nanofibrous composite membrane containing 1 M LiPF6 in EC and DMC (1:1 v/v) was studied in detail
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