Nanostructures for lithium intercalation can be obtained by combining carbon nanotubes with nanoparticles, to achieve a composite that can be applied as electrochemical energy storage device. Depending on the chemical composition and architecture of the nanostructure, it can be used to develop batteries, supercapacitors, or hybrid battery-supercapacitor devices. Here, we study how the V₂O₅.nH₂O concentration affects lithium intercalation into the V₂O₅.nH₂O/cup-stacked carbon nanotube (CSCNTs) nanostructure. First, CSCNTs were directly grown on the surface of a nonwoven carbon fiber felt (CF). Then, ε/δ-V₂O₅.nH₂O was electrodeposited on the CF/CSCNT composite. Between 4.2 and 1.5 V, 34 wt% V₂O₅.nH₂O load provided lithium specific capacity of 633 mAhg⁻¹ at 0.5 Ag⁻¹ for 300 discharge/charge cycles with lower fading capacity. Higher or lower V₂O₅.nH₂O load diminished this performance. Depending on the V₂O₅.nH₂O load and scan rate, this new nanostructure can also operate as a pseudo-capacitor, to deliver 610 F g⁻¹ at a scan rate of 10 mV s⁻¹ between 4.0 and 1.5 V. We discuss this dependence in terms of V₂O₅.nH₂O morphology and the presence of a junction between CSCNTs and V₂O₅.nH₂O.

可以通过将碳纳米管与纳米颗粒结合以获得用于锂嵌入的纳米结构，从而获得可用作电化学储能装置的复合材料。根据纳米结构的化学组成和结构，它可用于开发电池，超级电容器或混合电池-超级电容器设备。在这里，我们研究了V ₂ O ₅ .nH ₂ O的浓度如何影响锂嵌入到V ₂ O ₅ .nH ₂ O /杯状碳纳米管（CSCNTs）纳米结构中。首先，将CSCNT直接生长在非织造碳纤维毡（CF）的表面上。然后，ε/δ-V ₂ ø ₅ .NH ₂O电沉积在CF / CSCNT复合材料上。在4.2和1.5 V之间，负载为34 wt％的V ₂ O ₅ .nH ₂ O在0.5 Ag ^{- 1下}进行300次放电/充电循环时，锂比容量为633 mAhg ^{- 1}，具有较低的衰落容量。较高或较低的V ₂ O ₅ .nH ₂ O负载都会降低此性能。取决于在V ₂ ø ₅ .NH ₂ O负载和扫描速率，这种新的纳米结构也可以作为一个伪电容器操作，以提供610 F G ^-1以10毫伏s的扫描速率^-1在4.0至1.5 V之间。我们从V ₂ O ₅ .nH ₂ O形态以及CSCNT与V ₂ O ₅ .nH ₂ O之间存在结的角度讨论了这种依赖性。