【摘要】 通过香蒲绒的热解和KOH活化制备香蒲活性炭。香蒲活性炭的BET比表面积和孔容积分别为1 913. 7 m~2/g和0. 893 cm~3/g,主要为孔径约2 nm的微、介孔。当其用于锂硫电池正极时,碳基质的微介孔可以高度分散和负载非导电性硫,并有效持硫、抑制多硫化物的扩散;同时孔壁可以较快地进行电子输运。因此硫/香蒲活性炭复合材料具有较好的循环性能和倍率容量,0. 12C下首次放电容量可达1 150. 1 m Ah/g,100次循环后比容量为663. 3 m Ah/g。不同倍率测试表明,复合电极均具有较好的循环稳定性,1C下可逆容量约600 m Ah/g。更多还原

【Abstract】 Cattail derived activated carbon( CAC) was prepared by pyrolysis of natural cattail wool following with KOH activation. The CAC has a high BET surface area of 1 913. 7 m~2/g,large pore volume of 0. 893 cm~3/g and pore size distribution mainly at ～ 2 nm,which are beneficial to make the non-conductive sulfur being loaded into the pores of the carbon matrix in highly dispersed state,facilitate electrons transports,and restrain the diffusion of polysulfides during the galvanostatic charge/discharge processes using as the cathode matrix for the rechargeable Li-S battery. The S/CAC composite material shows an excellent cycle performance and a good rate capability. At 0. 12 C current,the first discharge capacity of 1 150. 1 m Ah/g and 663. 3 m Ah/g after 100 cycles,can be obtained respectively. Different rates test shows that S/CAC composite has good cycle stability and a stable ～ 600 m Ah/g discharge capacity at 1 C rate.更多还原