无粘结剂V_2O_5纳米线/CNT电极的制备及电化学性能

Preparation and Electrochemical Properties of Vanadium Oxide Nanowire-Carbon Nanotube Binder-Free Electrodes

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30mA·g-1时,首次放电比容量能达到290.6mAh·g-1,接近于V2O5的理论比容量,10次循环以后为265.4mAh·g-1,容量保持率为91.32%。当电流密度为600mA·g-1,首次放电比容量71.2mAh·g-1,第10次循环为62.5mA·g-1,容量保持率可达87.8%。

Mix the carboxylation CNTs and V2 O5 nanowires together, disperse into water with ultrasonic processing, then treat the products with vacuum titration to obtain the binder-free 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 290. 6 mAh · g-1, which is close to the specific capacity, and after 10 cycles, the capacity is 265.4 mAh · g-1 with a retention of 91.32%. When the current density is up to 600 mA· g-1, the initial and 10th discharge capacity are 71.2 mA· g-1 and 62.5 mAh · g-1 with a retention of 87.8%.