SiO ₂ /C Composite Derived from Rice Husks with Enhanced Capacity as Anodes for Lithium‐Ion Batteries

High‐capacity SiO 2 /C composites with uniform distribution, rice husks (RHs) as raw materials, were scalably prepared by the ball milling method. Based on a fact that the porous SiO 2 nanoparticles and carbon in RHs possess natural properties, ball mill could visibly decrease grain sizes of clustering SiO 2 particles and C blocks and then improve the dispersivity of the two components, finally forming desirable SiO 2 /C composite, which can generate more active sites for Li + storage as well as can effectively buffer the volume change during cycling. Therefore, SiO 2 /C composites, evaluated as anode for lithium ion batteries, exhibited an excellent electrochemical performance, especially the highly reversible capacity of 827 mA h g −1 over 300 cycles at 100 mA g −1 and 530 mA h g −1 at the large rate of 500 mA g −1 , which suggests that the facile ball mill with environmental friendliness and large‐scale preparation may be available for electrode materials derived from biomass.