Fig. 5. (a) Dependence of charge/discharge capacities on cycle number for Si electrodes operated in the voltage ranges of 0.005–2.00 V and 0.005–0.50 V. (b) Cross-sectional FE-SEM images of the electrodes before and after the 20th cycling in the voltage range of 0.005–0.50 V. Fibers observed at top part of the images are glass separator.
