介孔碳纳米微球在锂离子电池中的应用

Application of nano-mesoporous carbon spheres in Li-ion battery

将介孔碳纳米微球粉末与磷酸铁锂(LiFePO_4)、石墨混合(介孔碳含量为8%)作为电池的正负极材料,组装锂离子电池。添加碳纳米微球后,电池的可逆性和比容量均优于未添加的,尤其在大电流9.0 A充放电时,充电电压平台约低0.25 V;充放电效率高出约88.5%;输出容量与放电电流为0.8 A时的比值高约15%。在低温0℃、-10℃和-20℃放电时,添加碳纳米微球的电池输出容量与额定容量的比值比未添加的分别高12.4%、14.9%和16.7%。

A certain amount of nano-mesoporous carbon spheres（ NCSs, 8% ） mixed with lithium iron phosphate （LiFeP04） and graphite as active material was assembled into the Li-ion battery. After adding NCSs, the reversibility and specific capacity of the battery were better than those without NCSs, especially, when charged-discharged at 9.0 A, the charge voltage platform was showed lower about 0. 25 V, the charge-discharge efficiency was increased about 88%. The ratio of output capacity and the capacity at the current of 0. 8 A was higher about 15 %. At low temperature of 0℃, - 10℃ and - 20℃, the ratio of the output capacity of battery adding NCSs to the rated capacity was 12. 4% ,14. 9% and 16. 7% higher than that of the non-adding one,respectively.