Unlike other long cycle life and hi

Unlike other long cycle life and high capacity nanostructured Si
anodes21,22,37, the nano-Si here is derived without any use of energyintensive
processes such as silane CVD or laser ablation. Our
approach uses abundant and sustainable source: rice husks. The
Mg metal reducing reagent can be regenerated through electrolysis
and thus the whole process is green. Moreover, the method here
has superior scalability to other nano-Si fabrication processes. For
a demonstration in laboratory, we increased the size of our reaction
and recover one gram of nano-Si from RHs (Supplementary
Fig. S13).