Rice hull ash hard carbon exceeds both, with a storage capacity of more than 700 mAh—nearly double that of graphite. The nanoporous structure of the isolated hard carbon is thought to contribute ...

Rather than importing graphite mined from China or Mexico, rice hull ash could provide a higher quality domestic material for making battery electrodes. The process is also more sustainable than ...

A closer inspection of ash from burned rice hulls, the hard outer layer of rice grains, revealed a form of carbon that could nearly double the energy density of typical lithium-ion or sodium-ion ...