The Industrial Preparation Of Conducting Polymers Electrode Materials And Research Of Voltage Limit In A Supercapacitor

The preparation of supercapacitor electrode materials and its voltage limit play akey role in the capacitor performance. In this paper,we do some work in thefollowing two aspects according to it:（1）Now the electrochemical preparation of conducting polymer is still in thelaboratory stage,which is not suitable for large-scale industrial production, and inthis paper,a stacked electrolyser which combines the actived carbon and Ti isconstructed for electrodeposition of conducting polymers in the two-electrodesystem.It’s a tentative exploration for the industrial production of conductingpolymers.In this paper, a stacked electrolyser with titanium bipolar plates which ispre-coated with activated carbon (Cabot Monarch1300pigment black) isconstructed for electrodeposition of conducting polymers(CP). Then we depositethree kinds of conducting polymers in the stacked electrolyser by changing thedeposition charge and amount of pre-coated CMPB,and construct a unit cellsymmetrical CP(+)|KCl (1mol/L)|CP(–) and a stacked asymmetrical CP(+)|KCl(1mol/L)|CMPB(–) supercapacitors with the deposited electrodes. Cyclicvoltammetry and galvanostatic charge/discharge is used to test the capacitorperformance of both supercapacitors. The result of the experients indicate:①The CMPB can lower the deposition voltage,increase the current and reducethe energy consumption effectively.②Both supercaps have exhibited goodcapacitive properties and their capacitance values coincide with the designvalues,suggesting that the bipolar electrolyser have a very high current efficiencyduring the electrodeposition,and we can make the supercapacitor electrodes whosecapacitance values is coincided with the design values simply by changing thedeposition charge and amount of pre-coated CMPB.So it offers a highlyefficient,simple and controlled manufacturing solution towards mass production ofsupercapacitor electrodes with idential capacitance values by electrodeposition.（2）Due to the voltage limit is vital to performance of aqueous supercapacitors,itis very important to research the issues about it.Firstly,We prepare variouspseudocapacitance and carbon nanotube composite material by electrodeposition andredox deposition in the three-electrode system,then assemble and test both thesymmetrical supercapacitor and asymmetrical supercapactior with differentelectrode material in a facile tube cell, and cyclic voltammetry is used to research the different issues about voltage limits of aqueous supercapacitors.Then compare thevoltage limits of supercapacitors with various electrode selections. A simple modelis built to correlate the voltage limits with the capacitive potential ranges of the twoelectrodes of a supercapacitor. The result of the experients indicate:①The capacitive potential ranges of individual electrode determine the voltagelimit of a supercapacitor. so we can improve the voltage limits by selecting theappropriate positive and negative electrode materials.②The first CV cycle has apotential conditioning effect to adjust the electrode potentials and reduce theirreversibility in the following cycles.③Beyond the voltage limit, a supercapacitormay still operate, but at a cost of reduced cycle life.