Figure 1. Particle size change of Si after milling and classification process.
Figure 2. Particle size distribution of Si after ball milling with different material ratios: (a) Si 50 g / steel ball 3 kg / 8 h, (b) Si 100 g / steel ball 3 kg / 8 h, (c) Si 110 g / steel ball 3 kg / 8 h, (d) Si 250 g / steel ball 4.5 kg / 12 h.
Figure 3. Analysis of Si particle after ball milling, (a) XRD pattern, (b) SEM image.
Figure 4. Particle size distribution of Si after (a) 1st pulverization, (b) 2nd pulverization, (c) classification.
Figure 5. SEM images of Si particles: (a) before and (b) after classification process.
Figure 6. Electrochemical capacity and coulomb efficiency characteristics of secondary pulverized Si up to 10 cycles.
Figure 7. Charge/discharge curves of Si anodes with particle size of (a) D50 = 0.230 μm, (b) D50 = 0.297 μm, (c) D50 = 0.300 μm.
Table 1. Average particle size and BET analysis after ball milling of Si
Table 2. Comparison of Si particle size before and after classification
Table 3. Electrochemical properties of second pulverized Si and commercialized Si
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