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The rice husk is the outer covering of a rice kernel and protects the
inner ingredients from external attack by insects and bacteria. To
perform this function while ventilating air and moisture, rice
plants have developed unique nanoporous silica layers in their
husks through years of natural evolution. Despite the massive
amount of annual production near 108 tons worldwide, so far rice
husks have been recycled only for low-value agricultural items. In
an effort to recycle rice husks for high-value applications, we convert
the silica to silicon and use it for high-capacity lithium battery
anodes. Taking advantage of the interconnected nanoporous
structure naturally existing in rice husks, the converted silicon
exhibits excellent electrochemical performance as a lithium battery
anode, suggesting that rice husks can be a massive resource
for use in high-capacity lithium battery negative electrodes.PNAS×îÐÂÎÄÕ¡ªº«¹ú¿ÆÑÐÈËÔ±ÓÃ·ÏÆúµ¾¿ÇÖÆÔìï®µç³Ø
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