(Invited) Fabrication and Characterization of Silicon Microwire Anodes by Electrochemical Etching Techniques

Abstract

With a technique principally allowing for large scale production based on electrochemical etching, silicon microwires for Li ion battery anodes are produced. Those silicon wires exhibit high cycling stability with high amount of active material which does not degenerate over the cycling period due to the formation of a homogeneous solid electrolyte interface around each wire. This study summarizes the importance of the (exact) battery work parameters and shows the influence of different wire dimensions on the battery performance and cycling stability. Furthermore, it compares two anode variations in which the wires can be incorporated. FFT-impedance analysis shows the characteristic resistance changes under specific conditions, which relate directly to the processes of the wires, allowing to optimize the electrochemical processes.