As high capacity cathodes for Li-ion and Na-ion batteries, carbon bonded and encapsulated selenium composites (C/Se) with a high loading content of 54% Se were synthesized by the in situ carbonization of a mixture of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) and selenium (Se) in a sealed vacuum glass tube. Because Se is physically encapsulated and chemically bonded by carbon, the sh...
