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.
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