TEM examination of innovative materials for energy conversion
Within this dissertation, different promising material systems for battery anodes as well as one for cathodes are being examined by methods of transmission electron microscopy (TEM). In Kiel, a high-capacity battery electrode was developed based on a novel silicon microwire structure. As a part of this work, causes and effects of electrode degradation are being examined. Recent advances are presented which pave the way to the development of more powerful electrodes. Not only crystalline, but also amorphous and porous silicon modifications were considered being synthesized by chemical extraction methods. Further spinel-type transition metal oxides providing a wide variety of applicable compositions were examined. Binary and ternary compounds are being researched and compared with respect to microstructural changes during charging/discharging. As counterpart, a sulfur-based cathode material with a theoretically high capacity are presented. Finally, recently synthesized copper-poor compounds are introduced and analyzed with respect to their ability to perform as photo catalyst to generate hydrogen.
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