CAJ | 학술논문

以碳纳米管和氧化石墨烯(CNTs/GO)为主体材料,通过化学还原法制备了CNTs/GO负载硫的复合正极材料CNTs/GO/S.扫描电子显微镜(SEM)及透射电子显微镜(TEM)测试表明, CNTs均匀插层在GO片间,从而形成三维多孔结构,有利于电解液的浸润;活性物质硫均匀地负载在CNTs/GO表面.电化学测试表明, CNTs/GO/S复合材料具有高的比容量和良好的循环稳定性:在1C倍率电流密度下,复合材料首次放电比容量高达904 mAh·g-1,经过50圈循环之后,复合材料的比容量仍保持在578 mAh·g-1.
이탄납미관화양화석묵희(CNTs/GO)위주체재료,통과화학환원법제비료CNTs/GO부재류적복합정겁재료CNTs/GO/S.소묘전자현미경(SEM)급투사전자현미경(TEM)측시표명, CNTs균균삽층재GO편간,종이형성삼유다공결구,유리우전해액적침윤;활성물질류균균지부재재CNTs/GO표면.전화학측시표명, CNTs/GO/S복합재료구유고적비용량화량호적순배은정성:재1C배솔전류밀도하,복합재료수차방전비용량고체904 mAh·g-1,경과50권순배지후,복합재료적비용량잉보지재578 mAh·g-1.
Three-dimensional (3D) hierarchical CNTs/GO/S ternary composites were prepared by solution-based reaction-deposition, using graphene oxide (GO) and carbon nanotubes (CNTs) as precursors. Scanning electron microscopy (SEM) and transmission electron microscope (TEM) indicated a uniform S coating on CNTs/GO which arose because of the large GO specific surface area. CNTs interspersed between the GO layers to form a 3D porous structure. Constant current charge-discharge tests showed that CNTs/GO/S composites had a high discharge capacity and excel ent cycling stability, and delivered a high initial discharge capacity of 904 mAh·g-1 at 1C rate. After 50 cycles at the same rate, the reversible capacity remained at 578 mAh·g-1.