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Porous activated carbon derived from corncob without further element-doping was employed as a coating interlayer on polypropylene (PP) separator in lithium sulphur (Li/S) battery. The highly electrically conductive activated carbon served as a pseudo current collector dramatically reducing the interface resistance and thus improved the reaction kinetics of the cell system. Furthermore, the mirco/mesoporous structure and large pore volume of activated carbon provided an excellent environment to trap soluble polysulfide intermediates resulting in shuttle reaction and buffered the volume change of sulphur during cycling, prominently alleviating capacity fading. The cell with activated carbon coating layer maintained a high reversible specific capacity of 839.8 mA h g -1 after 100 cycles at a current rate of 0.3 C (1 C = 1672 mA g -1 ), comparing to 496.7 mAh g -1 of the cell with only pristine PP separator. Extended cycle life test exhibited a discharge capacity of 648 mAh g -1 after 350 cycles under 0.5 C. Moreover, thickness influence of activated carbon coating layer indicated that a thin layer of 29 μm coating was sufficient enough to improve the electrochemical performance of Li/S battery. Thicker coating was only able to slightly improve the performance of battery.

Corncob-derived Porous Carbon as an Interlayer Coating to Improve the Performance of Lithium Sulphur Battery