蔗糖基炭材料的制备及其电化学性能研究  

PREPARATION AND ELECTROCHEMICAL PROPERTIES STUDY OF SUCROSE BASED CARBON MATERIALS

作　　者：张宝田 胡步千 于宝军[3] 陈明鸣[3] 

机构地区：[1]天津天湖炭素制品有限公司,天津300382 [2]中国五环工程有限公司,武汉430223 [3]天津大学化工学院绿色合成与转换教育部重点实验室,天津300072

出　　处：《炭素》2012年第3期13-19,共7页Carbon

摘　　要：在蔗糖中按不同比例掺入膨胀石墨（EG），在800qC和1000℃炭化制得蔗糖基炭材料。通过扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线电子衍射（XRD），对蔗糖基炭材料的表面形态和内部结构进行表征。采用循环伏安（cv）和恒流充放电表征其电化学性能，并分析其储锂机理。电化学实验结果表明：掺入3％质量比的EG在800℃下炭化得到的蔗糖基炭材料具有最优的大电流充放电性能，其在100mA／g的电流密度下，可逆放电容量为210mAh／g，容量保持率为85．5％；在200rnA／g的电流密度下，可逆放电容量为178．6mAh／g，容量保持率为72．5％。Sucrose-based carbon materials were obtained by adding different contents of expanded graphite to sucrose and then being pyrolyzed at the temperatures of 800℃ and 1000℃. Analysis methods including SEM, TEM, and XRD were applied to study the surface morphology and internal structures of as-prepared samples. Electrochemical testing methods including cyclic vohammetry and galvanostatic charge-discharge processes were applied to study the electrochemical performance and analyze the mechanism of lithium storage in the obtained material. The results of electrochemical testing show that the sucrose-based carbon material obtained by adding 3（wt）% EG and being pyrolyzed at 800℃ exhibits the best charge-discharge performance at high current densities. Its reversible discharge capacity is 210 mAh/g at the current density of 100mA/g with a capacity retention ratio of 85.5%. The reversible discharge capacity keeps above 178.6 mAh/g at the current density of 200 mA/g with a capacity retention ratio of 72.5%.

关 键 词：蔗糖 膨胀石墨 锂离子电池 大电流性能 

分 类 号：TQ165[化学工程—高温制品工业]