Sabrina Heuer

 

Manufacturing and characterization of lithium lanthanum zirconate solid state electrolytes for lithium-ion batteries

fig.1: Set-up of a conventional lithium-ion-battery (left) and a solid-state battery (right).[2] Copyright: http://www.spring8.or.jp/en/news_publications/research_highlights/no_49/ fig.1: Set-up of a conventional lithium-ion-battery (left) and a solid-state battery (right).[2]

The continuously increasing technological advances in our society are leading to a higher demand for safe and efficient energy storage systems. The lithium-ion batteries which are mainly used at the present time exhibit many safety issues due to organic electrolytes. A degree of safety can be obtained by inorganic solid state materials. These include garnet structures, such as the cubic LLZ (Li7La3Zr2O12), which is characterized by high lithium-ion conductivity. The lithium-ion conductivity of these materials is about 10-3- 10-4 S cm 1 . [1]
For good ion conductivity and separation of anode and cathode LLZ ceramics of high densities are required.
In this master thesis, the sintering behavior and microstructure development of LLZ should be investigated. The characterization should be mainly performed via dilatometry, X-ray powder diffraction and scanning electron microscopy.

[1] D.Rettenwander, R.Wagner, J.Langer, M.E.Maier, M.Wilkening, G.Amthauer, Eur..J.Mineral. 2016, 28, 619-629.

[2] http://www.spring8.or.jp/en/news_publications/research_highlights/no_49/