Fig. 9.

Electrochemical evaluation of macroporous Si and the carbon-coated macroporous Si. a Voltage profiles of chemically etched Si anodes at 0.1 C rate between 0.005 and 1.2 V in coin-type half cell. b Voltage profiles of the carbon-coated porous Si anodes at 0.1 C (the first cycle) and 0.2 C (2nd–50th cycles) in the same conditions. c Plot of charge capacity versus cycle number obtained from voltage profiles seen in (b). d Rate capabilities of the carbon-coated porous Si anodes [37]