Scalable processing and capacity of Si microwire array anodes for Li ion batteries
1 Institute for Physics, Meritorious Autonomous University of Puebla (BUAP), Puebla 72570, Mexico
2 Institute for Materials Science, Christian-Albrechts-University of Kiel, Kiel 24143, Germany
Nanoscale Research Letters 2014, 9:417 doi:10.1186/1556-276X-9-417Published: 21 August 2014
Si microwire array anodes have been prepared by an economical, microelectronics compatible method based on macropore etching. In the present report, evidence of the scalability of the process and the areal capacity of the anodes is presented. The anodes exhibit record areal capacities for Si-based anodes. The gravimetric capacity of longer anodes is comparable to the one of shorter anodes at moderate lithiation/delithiation rates. The diffusion limitation of the lithium ions through the electrolyte in depth among the wires is the limiting factor for cycling longer wires at high rates.
82.47.Aa; 82.45.Vp; 81.16.-c