摘要
以咖啡渣为原料,利用碳化与活化反应制备出多孔的碳材料,并利用X射线衍射、扫描电子显微镜、Raman光谱和N2吸附脱附等方法分析该材料的物理化学性质.结果表明:该材料具有较高的石墨化程度;当质量电流密度为0.1A/g时,其首圈放电和充电质量比容量值分别为1 029mA·h/g和461mA·h/g,且循环稳定性较好,其质量比容量远高于石墨的理论容量(372mA·h/g).
An easy carbonization and activation approach was employed to synthesize porous carbon material with coffee grounds as carbon source. X-ray diffraction （XRD）, Raman spectroscopy, and scanning electron microscopy （SEM） show that the prepared material possesses a disordered structure with a relatively high graphitization degree. The existence of mesopores was confirmed by the nitrogen adsorption/desorption isotherms as well as the pore size distribution curve. At a mass current density of 0.1 A/g, the initial discharge and charge capacities of the prepared material can reach as high as 1 029 and 461 mA ·h/g, respectively, much higher than the theoretical capacity of graphite （372 mA· h/g）.
出处
《吉林大学学报（理学版）》
CAS
CSCD
北大核心
2014年第4期802-806,共5页
Journal of Jilin University:Science Edition
基金
国家自然科学基金(批准号:21301117)
关键词
锂离子电池
负极材料
多孔碳
生物质
咖啡渣
lithium ion battery
anode material
porous carbon
biomass
coffee grounds
