Sol-gel prevleke na LiNiO [spodaj] 2 katodnem materialu

magistrsko delo

Katarina Vukosav (Author), Robert Dominko (Mentor), Igor Plazl (Thesis defence commission member), Boštjan Genorio (Thesis defence commission member), Marjan Marinšek (Co-mentor)

Abstract

Uporaba akumulatorjev v zadnjih letih vse bolj narašča. Že dolgo so najboljša izbira za komercialno uporabo Li-ionski akumulatorji, pri katerih se za anodni material še vedno večinoma uporablja grafit, katodni materiali pa so še kar v razvoju. Prvi in komercialno največkrat uporabljen katodni material je LCO (LiCoO2), ki je zaradi visoke cene Co in zmožnosti reverzibilne izmenjave 0.55 mola Li predrag za uporabo v električnih avtomobilih. Kot alternativni katodni material se vse pogosteje omenja LNO (LiNiO2). LNO ima višjo kapaciteto saj lahko reverzibilno izmenja 0.75 mola Li in ima nižjo ceno zaradi večje dostopnosti Ni v primerjavi s Co. Njegova težava je stabilnost pri višjih napetostih. Zato smo v sklopu te magistrske naloge poskušali izboljšati stabilnost LNO katod s tvorbo Al2O3 prevlek s pomočjo sol-gel metode s tremi različnimi prekurzorji: aluminijev sek-butoksid (Al(O-s-But)3), aluminijev izopropoksid Al(O-i-Pr)3 in aluminijev acetat (Al(Ac)2(OH)). Iz dobljenega materiala smo izdelali katode ter z galvanostatskimi meritvami ugotavljali, s katerim prekurzorjem, s kolikšno količino prekurzorja ter s katero temperaturo žganja dosežemo najboljšo stabilnost. Kot najboljši prekurzor se je izkazal Al(Ac)2(OH), in sicer v količini, ki rezultira v 0,25 ut.% Al2O3 glede na LNO, pri temperaturi žganja 400 °C.

Keywords

Li-ionski akumulator;LNO katode;prevleke;stabilnost;magistrska dela;

Data

Language:	Slovenian
Year of publishing:	2022
Typology:	2.09 - Master's Thesis
Organization:	UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher:	[K. Vukosav]
UDC:	621.355:620.1(043.2)
COBISS:	135272451
Views:	38
Downloads:	17
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Sol-gel coatings on LiNiO2 cathode material
Secondary abstract:	The use of batteries has been increasing in recent years. For a long time, the best choice for commercial use have been Li-ion batteries, where graphite is still the most used anode material, and cathode materials are still being developed. The first and commercially most successful cathode material is LCO (LiCoO2), which is impractical for use in electric cars due to the high cost of Co and the ability to reversibly exchange only 0.55 mol of Li. As an alternative to LCO cathode material, LNO (LiNiO2) material is presented. LNO has a higher capacity (0.75 mol of Li can be reversibly exchanged) and a lower price due to the greater availability of Ni. Since LNO has a problem with stability at higher voltages, the improvement of the stability of LNO cathodes was the main goal of my master's thesis. We tried to improve the stability by forming Al2O3 coatings using the sol-gel method with the use of three different precursors: aluminium sec-butoxide (Al(O-s-But)3), aluminium isopropoxide (Al(O-i-Pr)3), and aluminium acetate (Al(Ac)2(OH)). We made cathodes from the obtained material and using galvanostatic measurements determined, with which precursor, with what amount of said precursor, and with which calcination temperature the best stability is achieved. Al(Ac)2(OH) in an amount that results in 0.25 wt% of Al2O3 and calcinated at 400 °C showed the best results.
Secondary keywords:	Li-ion batteries;LNO cathodes;coatings;stability;Akumulatorji;Materiali;Univerzitetna in visokošolska dela;
Type (COBISS):	Master's thesis/paper
Study programme:	1000376
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, smer Kemijsko inženirstvo
Pages:	48 str.
ID:	17215818