采用芦苇干花制备锂离子电池负极材料

Porous carbon material derived from Pharagmites australis dried flowers as an anode for lithium-ion batteries

本文以芦苇干花为原料,通过氢氧化钾活化致孔制备了多孔碳材料(PC)。采用X射线粉末衍射(XRD)、拉曼光谱、氮气吸附脱附、扫描电镜(SEM)和透射电镜(TEM)等表征手段分析材料的结构与形貌,并进行了恒电流充放电测试以研究其电化学性能。测试结果表明PC材料具有大的比表面积和高的孔隙率,用作锂离子电池负极时,具有较高的容量(在1 A·g^(-1)电流密度下循环100次后,容量为512 m A h·g^(-1))和优良的倍率性能(在2 A·g^(-1)电流密度下,容量为364 m A h·g^(-1))。

In this paper,a porous carbon material（ PC） was prepared by KOH activation treatment. X-ray diffraction（ XRD） ,Raman spectroscopy,nitrogen adsorption-desorption isotherms,scanning electron microscopy （SEM ） and transmission electron microscopy （TEM）were used to analyze the structure and morphology of the material. Results show that the PC material has a large specific surface area and high porosity. Galvanostatic charge-discharge tests were also carried out to study its electrochemical performance. When used as anode for lithium ion batteries,PC possessed a large lithium storage capacity（512 mAh · g-1 at 1 A·g-1 after 100 cycles） and excellent rate capability（364 mAh·g-1 at the current density of 2 A· g-1）.