CAJ | 학술논문

目的：制备高容量和循环性能稳定的锂离子电池复合电极材料。方法通过L-半胱氨酸(L-cys)辅助水热法合成SnS2-SnO2/石墨烯复合纳米材料,采用XRD,SEM,TEM和HRTEM技术对其进行结构表征,并采用循环伏安、恒流充放电和电化学阻抗技术研究了其电化学贮锂性能。结果随着水热溶液中L-cys的量增加,复合材料中少层数结构SnS2的含量也增加。当Sn4+/L-cys的物质的量之比为1∶4时,制得了SnS2/石墨烯复合纳米材料,而且石墨烯的存在在一定程度上抑制了SnS2沿c轴方向的生长,减少了层状SnS2的层数。结论由于二维层状结构的SnS2具有与石墨烯类似的微观结构和形貌,与石墨烯的复合具有更好的匹配性和相互协同效应,增强了SnS2/石墨烯复合材料的电化学贮锂性能,使其具有较高的可逆储锂容量、良好的循环性能和增强的倍率特性。
목적：제비고용량화순배성능은정적리리자전지복합전겁재료。방법통과L-반광안산(L-cys)보조수열법합성SnS2-SnO2/석묵희복합납미재료,채용XRD,SEM,TEM화HRTEM기술대기진행결구표정,병채용순배복안、항류충방전화전화학조항기술연구료기전화학저리성능。결과수착수열용액중L-cys적량증가,복합재료중소층수결구SnS2적함량야증가。당Sn4+/L-cys적물질적량지비위1∶4시,제득료SnS2/석묵희복합납미재료,이차석묵희적존재재일정정도상억제료SnS2연c축방향적생장,감소료층상SnS2적층수。결론유우이유층상결구적SnS2구유여석묵희유사적미관결구화형모,여석묵희적복합구유경호적필배성화상호협동효응,증강료SnS2/석묵희복합재료적전화학저리성능,사기구유교고적가역저리용량、량호적순배성능화증강적배솔특성。
ABSTRACT:Objective To prepare the nanomaterials with high specific capacity and stable cyclic performance as Li-ion battery anode. Methods The SnO2-SnS2/GNS composites were prepared by an L-cys-assisted hydrothermal method and characterized by XRD, SEM, TEM and HRTEM. The electrochemical performances of the composites for reversible lithium storage were measured by cyclic voltammogram, galvanostatic charge/discharge and electrochemical impedance spectroscopy. Results With the increasing amount of L-cys in the hydrothermal solution, the content of SnS2 in the low-rise structure of the composite material also increased. The SnS2/graphene nanocomposite could be prepared when the molar ratio of Sn4+/L-cys was 1 ∶ 4. The presence of graphene in-hibited the growth of SnS2 along the c-axis direction to some extent, and reduced the layer number of the layered SnS2 . Conclusion Because the two-dimensional layered SnS2 had similar morphology and microstructure to graphene, the compositing of the layered SnS2 with graphene exhibited better synergetic effects. Therefore, the SnS2/graphene nanocomposite showed a high reversible spe-cific capacity with stable cyclic performance and enhanced rate capability.