High-Energy Micro-grain Silicon Anodes for Lithium-Ion Technology

F.Farmakis, P.Selinis, N.Georgoulas, M.Hagen, P.Fanz, S.Schiestel, A.Kovacs
2015. 4th International Conference on Modern Circuits and Systems Technologies (MOCAST), Thessaloniki, May 2015

Abstact: As more and more applications require high energy density electrochemical storage systems that deliver more than 200 Wh/kg, Lithium-ion batteries with silicon-based anodes provide promising electrochemical properties especially high specific capacity. In this paper, we present a micro-grain structured silicon deposited by DC sputtering on special copper foil that serves as current collector. It is demonstrated that high-­‐density silicon anodes are obtained with more than 2000 mAh g-1 and 2.0 mAh cm‐2 which can be considered as a commercial value. Finally, it is found that with such anodes the irreversible capacity during the first galvanostatic cycle can be lower than 20%.
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