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Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 50: HL Poster IV

HL 50.46: Poster

Thursday, March 15, 2018, 19:00–21:00, Poster B

Metallurgical grade Silicon-Air Battery in alkaline solution — •Benjamin Griesche1, Richard Schalinski1, Stefan L. Schweizer1, and Ralf B. Wehrspohn1,21Institute of Physics, Martin-Luther-University Halle-Wittenberg, Germany — 2Fraunhofer Institute for Microstructure of Materials and Systems IMWS, Halle (Saale), Germany

The demand of energy storage technologies is one of the most discussed, regarding the transition from fossil fuels towards renewable energy systems. Therefore, lots of research was done. Some of them are highly promising, e.g. Lithium-ion battery, which achieved extreme progress over the last 25 years, and which is widely spread in portable devices. However, concerning the huge ever-increasing request, it is necessary to develop alternative battery systems. Metal-air batteries represent a category of these alternatives, from which the zinc-air battery (820 Ah/kg) is used in small applications. We are investigating another promising system, the silicon-air battery, since its components are abundant with a high theoretical specific capacity of 3.817 Ah/kg.

We introduce a new route of electrode preparation by using inexpensive metallurgical grade silicon as starting material and ball mill it to obtain small Si-nanoparticles. These were mixed with different binders to form slurries and were then coated on a substrate. The dried electrodes were analyzed by electrochemical methods in alkaline electrolyte solution and were investigated by optical methods. In order to optimize the battery performance a variation of chemical contents and treatments were performed.

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