二氧化锡/石墨烯柔性电极的制备及其在锂离子电池中的应用

采用简便的抽滤装置制备了三明治结构的不同粒径大小的二氧化锡(SnO_2)/石墨烯柔性薄膜电极,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、原子力显微镜(AFM)、比表面积(BET)和电化学等测试技术手段对样品结构、形貌和电化学性能进行表征,研究了二氧化锡颗粒大小对复合电极电化学性能的影响。结果表明,当SnO_2纳米颗粒的粒径为6 nm时柔性复合电极表现出最优的电化学性能,在100 m A/g的电流密度下经过100次循环后,可逆比容量保持在555 m A·h/g,远高于纯SnO_2和粒径过大或过小的SnO_2/石墨烯复合电极。

Preparation of Tin Oxide-Graphene Flexible Electrode and Its Application in Lithium Ion Battery

Flexible free-standing tin oxide(SnO₂) nanoparticles with different particle size/graphene sandwich paper electrodes were fabricated via a simple filtration method. The influence of SnO₂ particle size on electrochemical performances was investigated by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electronic microscopy(TEM), Brunauer, atomic force microscope(AFM), Emmett and Teller analysis(BET) and electrochemical measurements. The results show that the best electrochemical performance can be obtained when the particle size of nanoparticle is at 6 nm. When applied as an anode for lithium ion battery, an excellent cycling stability with a reversible capacity of 555 mA·h/g after 100 cycles at 100 mA/g is delivered, which is far superior to those of pristine SnO₂ and the corresponding composites composed of larger or smaller particles than optimum.