| In order to solve environmental problems and continuous depletion of the traditional fossil energy,safe,clean and renewable energy has been developed rapidly.The energy storage and conversion become the research hotspot.Porous carbon materials are widely used in this field with their high specific surface area,thermal stability and high conductivity.It is found that,the carbon source has important influence on the formation and properties of the porous carbon.In this paper,effects of two biomass carbon sources on the formation and properties of porous carbon were studied.And then the electrochemical properties of porous carbon and elemental sulfur composite was tested and analysed.With KOH as activator and domestic waste Shaddock peel as carbon source,activated porous carbon were prepared.Then the carbon sulfur composite material was prepared by the thermal compounding method.The structure,morphology and properties of the porous carbon and carbon sulfur composite were characterized by XRD?SEM?TEM and electrochemical comprehensive test instrument.Results show that the porous carbon SPC-3 has multi-level pore structure and high specific surface area.The as-prepared carbon sulfur composite as lithium-sulfur battery cathode has initial discharge specific capacity with 1017 mAh/g at 0.1 C.Under the current density of 0.5 C the initial discharge specific capacity is 534 mAh/g,and keeps in 404mAh/g after 50 cycles.The unique spindle structure of activated porous carbon(LMC)was prepared with living waste Longan shell inner film as carbon source and potassium hydroxide as activator.The specific surface area of LMC is 1062.3m~2/g.And the material LMC has abundant microporous structure in the surface and inside.LMC is used as a conducting framework for lithium-sulfur battery cathode materials,the initial discharge capacity of the activated carbon sulfur composite is 823 mAh/g at 0.5C and maintains a reversible capacity of 540 mAh/g after 50 cycles. |
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