摘要
氮掺杂多孔碳(N—C)作为锂硫电池硫载体材料具有巨大潜力,它们可以限制多硫化物的穿梭效应和溶解.在此,通过高温退火成功制备了源自一种三聚氰胺基有机聚合物(SNW-1)的N—C网络,并作为硫的载体材料成功制备出了 N—C/S.采用X射线衍射仪(XRD)、拉曼光谱仪(Raman)、红外光谱仪(FTIR)、扫描电镜(SEM)、透射电镜(TEM)、热重分析仪(TGA)表征了 N—C/S的形貌和结构.N-C/S正极材料表现出优异的循环性能(在334.4mA/g下500圈循环后为709mAh/g,每圈循环衰减为0.09％)和优异的倍率性能(在167.2、334.4、836、1 672、3 344和8 360 mA/g电流密度下分别对应放电比容量为1 102、958、808、721、536和428 mAh/g).
Abstract
Because nitrogen-doped porous carbon(N—C)may limit the shuttling effect and polysulfide dissolution,they hold great promise as sulphur carrier materials for lithium-sulfur batteries.In this work,N—C networks produced from a melamine-based organic polymer(SNW-1)were successfully created by high-temperature annealing,and N—C/S was successfully prepared as a sulphur carrier material.The shape and structure of N—C/S were characterised using X-ray diffractometer(XRD),Raman spectrometer(Raman),infrared spectrometer(FTIR),scanning electron microscope(SEM),transmission electron microscope(TEM),and thermogravimetric analyze(TGA).The N-C/S cathode material shows good rate performance(discharge specific capacities of 1 102,958,808,721,536,and 428 mAh/g at current densities of 167.2,334.4,836,1672,3344,and 8 360 mA/g,respectively)and excellent cycling performance(709 mAh/g after 500 cycles at 334.4 mA/g,with a decay of 0.09％per cycle).
维普
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