| Solid-state supercapacitors have the advantages of safety,less liquid leakage,light weight,and ultra-thinness,etc..They have become a research hotspot in recent years,but there have been some shortcomings,such as:ionic conductivity,thermal stability,low electrochemical performance,etc.,making traditional all solid-state supercapacitors have many limitations in practical applications.The gel polymer electrolytes has improved the performance of all-solid supercapacitors.It has extremely high ionic conductivity,thermal stability,mechanical properties,and high safety performance,environmental protection,etc.,and can be widely applied.This paper focuses on the performance of gel polymer electrolytes based on PAN-b-PEG-b-PAN,and improves the performance of gel polymer electrolytes through a series of modification methods such as blending and inorganic salt doping.The following describes all the work that will soon begin in this paper:?1?The preparation and properties of PAN-b-PEG-b-PAN gel polymer electrolytes and the electrochemical performance of all-solid supercapacitors based on the gel polymer electrolytes were investigated.PAN-b-PEG-b-PAN/DMF/TEABF4 was prepared by a solution casting method using triblock copolymers PAN-b-PEG-b-PAN,TEABF4 ion electrolyte,and dimethylforMami-de.TEABF4 gel polymer electrolyte membrane,room temperature ionic conductivity up to 4.9×10-22 S/cm;explore TEABF4 content of gel polymer electrolyte supercapacitor performance,found that with the electrolyte salt increases,electrochemical performance gradually However,when the mass ratio of PAN-b-PEG-b-PAN/DMF/TEABF4 is 1:15:15,the addition of TEABF4electrolyte will reduce the electrochemical performance.When the mass ratio of PAN-b-PEG-b-PAN/DMF/TEABF4 is 1:15:15,the specific capacitance can reach142.15 F/g,the energy density reaches 518.14 J/g,and 91.8%after 3000 cycles.The capacitance legacy rate.?2?Themodificationofgelpolymerelectrolytebasedon PAN-b-PEG-b-PAN was studied by blending with PVDF-HFP and doping inorganic salt Si O2.When inorganic doping is modified,when the amount of SiO2 added reaches 0.1 g,the performance of the all-solid supercapacitor is optimal,and the ionic conductivity at room temperature reaches 5.1×10-22 S/cm,and the specific capacitance value is 152 F/g.The density reached 554.04 J/g,and at the same time,the cycle stability was also improved;when the blend was modified,when m?PAN-b-PEG-b-PAN?:m?PVDF-HFP?=1:1,the total The performance of the mixed gel polymer electrolyte was the best,the room temperature ionic conductivity increased to 5.22×10-22 S/cm,based on PAN-b-PEG-b-PAN/PVDF-HFP blend gel polymer electrolyte all solid super The capacitor has a maximum specific capacitance of 153 F/g,an energy density of 557.69 J/g,and a capacitance retention rate of 94.2%after 3000 cycles.On the basis of blending,inorganic doping of Si O2 is performed to obtain the ionic conductivity.The value is 5.48×10-22 S/cm,and the specific capacitance value of the SiO2-doped PAN-b-PEG-b-PAN/PVDF-HFP blend gel polymer electrolyte all-solid supercapacitor is 159.8 F/g.After reaching 582.47 J/g,the capacitance retention rate after 3,000 cycles was increased to 97%,indicating that after modification of the gel polymer electrolyte,the ionic conductivity and the corresponding The electrochemical properties of the solid-state supercapacitor also improved.?3?In addition to the above work,the thermal stability of gel polymer electrolyte membranes,X-ray diffraction?XRD?and scanning electron microscopy?SEM?were also tested.The results prove that it can be stable in the temperature range of 25°C-120°C,and it proves that adding TEABF4 electrolyte reduces the crystallinity of PAN-b-PEG-b-PAN system,and the surface morphology of gel polymer electrolyte membrane presents The pore structure is evenly distributed,and the compatibility of various parts of the electrolyte is relatively strong.Meanwhile,in order to fabricate all-solid supercapacitors,electrodes of activated carbon?AC?materials were prepared,and the surface morphology of the electrodes was characterized using a scanning electron microscope?SEM?,and the BET test was performed to obtain nitrogen adsorption-desorption curves and pore size distribution spectra.The result shows that it is a porous structure with uniform pore distribution.These pores consist of fine carbon particles.Further research shows that the AC/GPE/AC system can well demonstrate the performance of the all-solid supercapacitor,and the activated carbon electrode and gel polymer electrolyte can be well contacted and penetrated,which is favorable for ion transport. |
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