石墨烯/碳纳米管复合导电剂对LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2的影响

研究球磨分散法制备的石墨烯和碳纳米管(CNT)(2∶3)复合导电剂对三元正极材料LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2性能的影响。SEM分析表明:复合导电剂均匀地分散在LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2表面,形成良好的"点-线-面"三维立体导电网络结构。电化学阻抗测试表明:复合导电剂可降低电池的内阻。充放电测试显示:在1%的低添加量下,使用复合导电剂的电池的首次放电(2.58~4.25 V,0.1 C)比容量比单独使用CNT的高7 mAh/g,比单独使用炭黑的高19 mAh/g;以10.0 C放电的比容量可达128 mAh/g,比单独使用CNT和炭黑的分别提高24 mAh/g和58 mAh/g。

Effects of graphene/carbon nanotube composite conductive agent to LiNi1/3Co1/3Mn1/3O2

The influence of composite conductive agent on properties of LiNi1/3Co1/3Mn1/3O2 was investigated.Graphene/carbon nanotube(CNT) (2∶ 3) composite conductive agent was prepared by ball milling dispersion method.SEM analysis showed that the graphene/CNT composite conductive agent could be evenly dispersed on the surface of LiNi1/3Co1/3Mn1/3O2,a good "dot-linesurface" three-dimensional conductive network structure was formed.Electrochemical impedance spectroscopy (EIS) test demonstrated that the resistance of the battery was reduced by the graphene/CNT composite conductive agent effectively.The cell charge and discharge tests showed that,under the low adding content of 1％,the initial discharge capacity(2.80-4.25 V,0.1 C)of the battery using composite conductive agent was 7 mAh/g higher than that of CNT,19 mAh/g higher than that of carbon black.The specific capacity could reach 128 mAh/g at 10 C rate discharge,which was 24 mAh/g and 58 mAh/g higher than that of CNT and carbon black,respectively.