PDF全文下载:2014040360
刘宁安, 彭红瑞*
(青岛科技大学 材料科学与工程学院,山东 青岛 266042)
摘要: 把羧化的碳纳米管与水热法合成的V2O5纳米线混合超声处理后,直接真空抽滤得到无粘结剂V2O5纳米线/CNT纸。对加入不同含量的碳纳米管的样品,综合考虑比容量和循环性能,其中m(V2O5)∶m(CNT)=1∶1样品的电化学性能最好。当电流密度为30 mA·g-1时,首次放电比容量能达到2906 mAh·g-1,接近于V2O5的理论比容量,10次循环以后为2654 mAh·g-1,容量保持率为9132%。当电流密度为600 mA·g-1,首次放电比容量712 mAh·g-1,第10次循环为625 mA·g-1,容量保持率可达878%。
关键词: 锂离子电池; 无粘结剂; 碳纳米管; V2O5
中图分类号: TM 912.9文献标志码: A
收稿日期: 20130312
作者简介: 刘宁安(1987—),男,硕士研究生.*通信联系人.
Preparation and Electrochemical Properties of Vanadium Oxide NanowireCarbon Nanotube BinderFree Electrodes
LIU Ningan, PENG Hongrui
(CollegeofMaterials Scienceand Engineering,QingdaoUniversityof Science and Technology,Qingdao266042,China)
Abstract: Mix the carboxylation CNTs and V2O5 nanowires together, disperse into water with ultrasonic processing, then treat the products with vacuum fitration to obtain the binderfree V2O5 nanowires/CNT composite paper. Considering the complex electrochemical properties,m(V2O5)∶m(CNT)=1∶1 is the best. When the current density is 30 mA·g-1, the initial discharge capacity is up to 2906 mAh·g-1, which is close to the specific capacity, and after 10 cycles, the capacity is 2654 mAh·g-1 with a retention of 9132%. When the current density is up to 600 mA·g-1, the initial and 10th discharge capacity are 712 mA·g-1 and 625 mAh·g-1 with a retention of 878%.
Key words: Liion batteries; binderfree; carbon nanotube; V2O5