Master Thesis defense by Dadi P. Sveinbjörnsson – Niels Bohr Institute - University of Copenhagen

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Master Thesis defense by Dadi P. Sveinbjörnsson

The hydrogen storage properties and the electrical conductivity of LiBH4+Lil mixtures were studied. Using powder diffraction and impedance spectroscopy, it was investigated if the highly conducting, high temperature phase of LiBH4 could be stabilized at room temperature by partical substitution of BH4- by other ions. The main aims were to see if the hydrogen desorption temperature of LiBH4 could be lowered, and to see if the conductivity of LiBH4 could be enhanced at room temperature. The main results are that the high temperature phase of LiBH4 can be stabilized at room temperature by Lil or LiBr addition, and that the LiBH4+Lil mixtures maintain the high conductivity behavior of the high temperature phase of LiBH4 down to room temperature. This could make such mixtures suitable as solid electrolytes in all-solid state batteries.

Master Thesis defense by Dadi P. Sveinbjörnsson