Reverzibilnost procesov na magnezijevi anodi

diplomsko delo

Katarina Vukosav (Author), Robert Dominko (Mentor)

Abstract

Uporaba akumulatorjev v zadnjih letih vse bolj narašča. Uporabljajo se v avtomobilski in računalniški industriji, prisotni so v večini vsakdanjih elektronskih naprav, pomembno vlogo pa imajo tudi pri shranjevanju energije, pridobljene z naravnimi energijskimi viri. Zaradi vedno večje porabe je vedno večja tudi potreba po njihovem razvoju. Zato raziskovalci iščejo nove materiale za elektrode in elektrolite, s katerimi bi presegli zmožnosti Li-ionskih akumulatorjev. Kot dobra alternativa se kažejo magnezijevi akumulatorji, katerih razvoj je sicer še precej na začetku. Eden glavnih problemov magnezijevih akumulatorjev je odtapljanje in nalaganje magnezija, saj se pri tem izgublja precejšnja količina magnezija, zaradi česar proces ni popolnoma reverzibilen. Na reverzibilnost procesa lahko pomembno vplivajo elektroliti, zato se v svoji diplomski nalogi posvečam možnim izboljšanjem določenih obstoječih elektrolitov z dodajanjem različnih dodatkov. Trem elektrolitom, APC v THF, Mg(B(hfpi)4)2 v DME in Mg(TFSI)2-2MgCl2 v DME, smo dodajali MgBr2, Bu2Mg in I2 ter s kronopotenciometričnimi meritvami ugotavljali, kako ti dodatki vplivajo na učinkovitost in prenapetost elektrokemijskih celic z magnezijevo anodo. Ugotovili smo, da različni dodatki na elektrolite različno vplivajo, saj določeni dodatki precej izboljšajo reverzibilnost odtapljanja in nagalanja magnezija ter zmanjšajo prenapetost, medtem ko drugi, zaradi reakcij z anodo ali samim elektrolitom, povzročijo ravno nasprotne rezultate.

Keywords

magnezijevi akumulatorji;delovanje akumularorjev;elektrolit;coulombska učinkovitost;prenapetost;reverzibilnost;diplomska dela;

Data

Language:	Slovenian
Year of publishing:	2020
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher:	[K. Vukosav]
UDC:	621.355(043.2)
COBISS:	22827779
Views:	535
Downloads:	160
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Reversibility processes on magnesium anode
Secondary abstract:	The use of batteries has increased in recent years. They are being used in the automotive and computer industry, they are present in most of portable electronic devices and also play an important role in storing energy obtained from renewable energy sources. Due to the increasing consumption, there is also a growing demand for their development. Researchers are looking for new active materials and electrolytes to exceed the capabilities of Li-ion batteries. Magnesium batteries are proving to be good alternative, but their development is still at its infancy stage. One of the main problem of magnesium batteries is deposition and stripping of magnesium, as a considerable amount of magnesium is lost, which makes the process not completely reversible. The reversibility process can be affected partially by electrolytes. For that reason, in this thesis, I focus on the possible improvements of selected electrolytes by adding various additives. MgBr2, Bu2Mg and I2 were added to three electrolytes APC in THF, Mg(B(hfpi)4)2 in DME and Mg(TFSI)2-2MgCl2 in DME, and galvanostatic measurements were used to determine how these additives affect coulombic efficiency and overpotential of electrochemical cells with magnesium anode. We found that different additives have different effects on electrolytes, as certain additives significantly improve the reversibility of magnesium stripping and deposition and decrease overpotential, while others, due to reactions with the anode or the electrolyte itself, cause the exact opposite.
Secondary keywords:	magnesium batteries;electrolyte;coulombic efficiency;overpotential;reversibility;
Type (COBISS):	Bachelor thesis/paper
Study programme:	1000372
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, UNI Kemijsko inženirstvo
Pages:	36 str.
ID:	11890310