CAJ | 학술논문

以K2SnO3为原料,采用简单的水热反应,通过基于静电引力的自组装机制,制得石墨烯包覆SnO2空心球的复合材料.采用SEM、TEM、XRD、N2吸附等温线研究了复合材料的形貌和结构；采用电化学方法研究了复合材料的锂离子电池负极性能.结果表明,复合材料为石墨烯包覆的直径约200~300nm的SnO2空心球,比表面积为140.1 m2·g-1.当放电电流密度为158m A·g-1时,充电比容量为425 mAh·g-1,库伦效率保持为92%以上,复合材料具有良好的循环性能.
이K2SnO3위원료,채용간단적수열반응,통과기우정전인력적자조장궤제,제득석묵희포복SnO2공심구적복합재료.채용SEM、TEM、XRD、N2흡부등온선연구료복합재료적형모화결구；채용전화학방법연구료복합재료적리리자전지부겁성능.결과표명,복합재료위석묵희포복적직경약200~300nm적SnO2공심구,비표면적위140.1 m2·g-1.당방전전류밀도위158m A·g-1시,충전비용량위425 mAh·g-1,고륜효솔보지위92%이상,복합재료구유량호적순배성능.
Graphene-encapsulated SnO2 hollow spheres composite (G-mh-SnO2) were synthesized by a simple hydrothermal method with K2SnO3as the precursor. This process was based on electrostatic self-assembly mechanism. Morphology and structure of resultant composite were characterized by SEM, TEM, XRD and nitrogen adsorption isotherms. Performance of the prepared composite as anode materials for lithium ion batteries was investigated by electrochemical method. The results showed composite was a graphene encapsulated SnO2 hollow spheres with a diameter of 200-300nm. The specific surface area was 140.1 m2·g-1. The charge specific capacitance was 425 mAh·g-1 at the current density of 158m A·g-1 after 50 cycles, and coulombic efficiency was up to 92%. The as-prepared exhibited bettercycling performance.