荷叶茎衍生多孔碳的制备及其在锂硫电池中的应用

以荷叶茎为原料,通过高温退火处理和KOH活化得到多孔碳,并将其作为硫的载体材料,最终得到C/S正极材料.通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、热重法(TG)、BET分析和喇曼光谱对目标产物进行了表征,研究了C/S正极材料的结构和形貌.将C/S作为锂硫电池正极材料进行电化学测试,其...

Preparation of Lotus Leaf Stem-Derived Porous Carbon and Its Application in Lithium-Sulfur Batteries

Porous carbon was obtained by high-temperature annealing treatment and KOH activation with lotus leaf stems as a raw material.Using the porous carbon as a carrier material for sulfur,a C/S positive electrode material was finally obtained.The target products were characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),thermogravimetry(TG),BET analysis and Raman spectroscopy.The structure and morphology of the C/S positive electrode materials were studied.The electrochemical testing was carried out using the C/S as a positive electrode material of lithium-sulfur batteries.The result shows that C/S positive electrode has excellent electrochemical performance.At a current density of 0.1 C(1 C=1672 mA·g^-1),the specific capacity of the C/S positive electrode reaches 847 mA·h·g^-1 after 200 cycles.At a current density of 0.5 C,the specific capacity of the C/S positive electrode reaches 690 mA·h·g^-1 after 500 cycles.Meanwhile,during the rate performance test of the C/S positive electrode,its specific capacities are 1067 and 417 mA·h·g^-1 at current densities of 0.1 C and 5 C,respectively.Besides,when the current density is restored to0.1 C,the specific capacity can be restored to 939 mA·h·g^-1,indicating that the C/S positive electrode has good rate performance.Therefore,the prepared C/S positive electrode has wide application prospect.