Lithium sulfur batteries are considered to be the most promising secondary battery because of its high theoretical specific capacity (1675 mA·h·g-1). However

the sulfur cathode faces the challenges

such as poor conductivity

low utilization of sulfur and poor structure stability of cathode. Biomass-based porous carbon

with cheap and accessible agricultural waste corn bracts as raw material

was prepared by chemical activation with KOH

and then composited with sublimate sulfur through modelling-fused method to form sulfur/carbon composite. The microscopic structure and morphology of the composites were characterized by XRD

SEM

TEM

and BET. The results show that the biomass-based porous carbon material possesses lamellar structure

which is similar to graphene

and abundant mesoporous structure on the surface of carbon. Furthermore

sulfur particles homogeneously distribute in the carbon conductive network. In addition

the electrochemical properties were studied by galvanostatic charge-discharge tests and electrochemical impedance spectroscopy. The results show that the battery possesses high discharge capacity and good cycle-life performance. The main reasons are as follow:the porous carbon structure like graphene

enhancing conductivity of sulfur cathode; the huge specific surface area which make electrochemical reaction sites increased

improving the utilization of sulfur.