Novel hierarchically porous carbon materials obtained from natural biopolymer as host matrixes for lithium-sulfur battery applications.

摘要: Novel hierarchically porous carbon materials with very high surface areas, large pore volumes and electron conductivities were prepared from silk cocoon by carbonization KOH activation. The novel carbon-encapsulated sulfur composites fabricated a simple melting process used as cathodes for lithium batteries. Because of the area structure material, soluble polysulfide intermediates can be trapped within cathode volume expansion alleviated effectively. Moreover, transport properties provide an conductive network promote utilization rate in cathode. carbon–sulfur composite exhibited specific capacity excellent cycle stability. results show initial discharge 1443 mAh g–1 retain 804 after 80 discharge/charge cycles at 0.5 C. A Coulombic efficiency retained up ...