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1913.7 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1150.1 mAh/g,100次循环后比容量为663.3 mAh/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 mAh/g。
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 1913.7 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 0.12C current,the first discharge capacity of 1150.1 mAh/g and 663.3 mAh/g after 100 cycles,can be obtained respectively.Different rates test shows that S/CAC composite has good cycle stability and a stable^600 mAh/g discharge capacity at 1C rate.
作者
刘树和
刘彬
赵焱
张兰
于晓华
李如燕
姚耀春
董鹏
LIU Shuhe;LIU Bin;ZHAO Yan;ZHANG Lan;YU Xiaohua;LI Ruyan;YAO Yaochun;DONG Peng(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;National Engineering Research Center of Waste Recovery,Kunming University of Science and Technology,Kunming 650093,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第8期14-19,共6页
Materials Reports
基金
国家自然科学基金(51264016)
昆明理工大学分析测试基金(20152230040)。
关键词
热解
香蒲
KOH
活性炭
锂硫电池
扩散
pyrolysis
cattail
KOH
activated carbon
lithium sulfur battery
diffusion
