Priprava elektrokemijskog superkondenzatora temeljenog na električnom dvosloju i određivanje njegovih svojstava

master's thesis

• Title (english): Construction of double layer electrochemical supercapacitor and its testing
• Author: Marko Božurić
• Mentor: Zoran Mandić (mentor)
• Committee member: Zoran Mandić (predsjednik povjerenstva)
• Committee member: Davor Antonić (član povjerenstva)
• Committee member: Stjepan Milardović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2015-07-16, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Analysis, Synthesis and Management of Chemical Processes

Abstract

Svrha ovoga rada je bila pripremiti ugljikovu elektrodu te sastaviti superkondenzator temeljen na električnom dvosloju i ispitati njegova svojstva metodom cikličke voltametrije a zatim ispitati svojstva komercijalnog superkondenzatora Eaton PowerStor® HB Series HB0830-2R5605-R prema zadanoj normi HRN EN 62576 te metodom elektrokemijske impedancijske spektroskopije (EIS). Elektrodni materijal pripremljen na bazi aktivnog ugljika Norit® DLC Super 30 u formi paste sa dodatkom vodljivog ugljičnog crnila Timcal® Super C45 te dodatkom polivinilidenfluorid (PVDF) i organskog otapala N-metil-2-pirolidon (NMP). Smjesa je nanesena na Al radnu elektrodu. Pripremljene su četiri radne elektrolitne otopine; dvije sa polarnim neprotičnim organskim otapalima etilen karbonatom i propilen karbonatom u smjesi volumnog sastava 50:50 gdje je u jednoj korišten elektrolit LiPF6 a u drugoj LiBF4 množinske koncentracije 0,1 mol dm^-3 a dvije otopine sa čistim otapalima koja nisu međusobno u smjesi a sastoje se od istih elektrolita sa istom koncentracijom. Sastavljen je superkondenzator u reakcijskoj posudi s pomoću navedenih kemikalija te su metodom cikličke voltametrije ispitana njegova svojstva u različitim područjima potencijala. Nakon toga ispitana su svojstva komercijalnog superkondenzatora prema zadanoj normi za ispitivanje električnih dvoslojnih kondenzatora za uporabu u hibridnim električnim vozilima HRN EN 62576. Tom analizom dobivene su 3 grupe podataka: 1. kapacitet, unutarnji otpor i maksimalna gustoća snage, 2. svojstva zadržavanja napona, 3. energetska učinkovitost. Dodatno je napravljena analiza metodom elektrokemijske impedancijske spektroskopije (EIS) kojom su dobiveni podaci o omskom otporu, kapacitetu te induktivitetu. Sve navedene analize komercijalnog superkondenzatora su napravljene pri 3 različite temperature; 0°C, 25°C, 60°C.

Abstract (english)

The purpose of this graduate work was to prepare a carbon electrode along with its electroactive material and to put together a double-layer supercapacitor and to analyze its characteristics with cyclic voltammetry. Then analysis was also done on a commercial supercapacitor (Eaton PowerStor® HB Series HB0830-2R5605-R) according to the given standard HRN EN 62576 and additionaly using the electrochemical impedance spectroscopy (EIS) method. The prepared electrode material was prepared as a paste consisting of the activated carbon Norit® DLC Super 30, conductive carbon black Timcal® Super C45, poly(vinylidenefluoride) (PVDF) and organic solvent N-methyl-2-pyrrolidone (NMP). The paste was put on the Al working electrode. Four electrolyte solutions were made; two of them with polar aprotic organic solvents ethylene carbonate (EC) and propylene carbonate (PC) with composition 50:50 by volume. One solution used LiPF6 as the electrolyte while in the second one the electrolyte was LiBF4 both with molar concentration of 0,1 mol dm^-3 and the other two solutions have been made out of same solvents which have not been mixed up together and the same electrolytes with the same concentrations. A supercapacitor was constructed in a vessel reactor and its characteristics have been analyzed with cyclic voltammetry in different potential ranges. After that characteristics of commercial supercapacitor were measured according to the standard for testing the electrical double-layer capacitors for use in hybrid electric vehicles HRN EN 62576. As a result of testings, three groups of dana were obtained: 1. capacity, internal resistance and maximum power density, 2. voltage maintenance characteristics, 3. energy efficiency. Additionaly testings were carried out using the electrochemical impedance spectroscopy (EIS) resulting in Nyquist and Bode plots from which ohmic resistances, capacities and inductivities were calculated. All testings of commercial supercapacitor were done at three different temperatures; 0°C, 25°C, 60°C.

• Keywords: superkondenzator; aktivni ugljik; ciklička voltametrija; ispitna norma; elektrokemijska impedancijska spektroskopija (EIS)
• Keywords (english): supercapacitor; activated carbon; cyclic voltammetry; testing standard; electrochemical impedance spectroscopy (EIS)
• Language: croatian
• URN:NBN: urn:nbn:hr:149:472155
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and technologies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-03-03 09:53:28