Cucumber-Like V₂O₅/poly(3,4-ethylenedioxythiophene)&MnO₂ Nanowires with Enhanced Electrochemical Cyclability

Abstract

Inspired by the cucumber-like structure, by combining the in situ chemical oxidative polymerization with facile soaking process, we designed the heterostructured nanomaterial with PEDOT as the shell and MnO(2) nanoparticles as the protuberance and synthesized the novel cucumber-like MnO(2) nanoparticles enriched vanadium pentoxide/poly(3,4-ethylenedioxythiophene) (PEDOT) coaxial nanowires. This heterostructured nanomaterial exhibits enhanced electrochemical cycling performance with the decreases of capacity fading during 200 cycles from 0.557 to 0.173% over V(2)O(5) nanowires at the current density of 100 mA/g. This method is proven to be an effective technique for improving the electrochemical cycling performance and stability of nanowire electrodes especially at low rate for application in rechargeable lithium batteries.

Facile Synthesis of V₂O₅ Hollow Spheres as Advanced Cathodes for High-Performance Lithium-Ion Batteries

“…As shown in Figure 5, all of the V2O5 cathodes exhibited a reasonably good cycling performance over the 50 cycles at 0.2 C. It is important to note that the V2O5-400 cathode delivers an initial discharge-specific capacity of 273 mAh·g −1 , which is close to the theoretical value (294 mAh·g −1 ). The specific capacity is also superior or comparable to most of the reported results based on differently structured V2O5 cathodes, such as the V2O5 nanorods (272 mAh·g −1 ) [8], V2O5 hollow microspheres (291 mAh·g −1 ) [9], V2O5 nanowires (278 mAh·g −1 ) [16], V2O5 nanosheets (272 mAh·g −1 ) [33] and V2O5/PEDOT/MnO2 (185 mAh·g −1 ) [21]. In addition, the initial specific capacity of the V2O5-400 cathode was higher than that of V2O5-300 (221 mAh·g −1 ) and V2O5-500 (229 mAh·g −1 ), indicating that the annealing temperature exerts a considerable influence on the electrochemical performance.…”

“…Developing nanostructured materials has been demonstrated to be an effective method to address these critical issues because nanomaterials have a large surface area to provide more reaction sites and can effectively shorten the diffusion distance of lithium ions during the insertion/extraction, thereby resulting in an enhanced cycling performance and rate capability [15,16]. A variety of V2O5 nanostructures, such as nanourchins [17], nanotubes [18], nanospikes [10], nanorods [8], nanowires [19][20][21], and nanobelts [22][23][24][25], have been fabricated, and improved electrochemical performance has been achieved with these materials when used as cathodes for LIBs. In particular, hollow structures are rather favorable because the unique hollow structure can effectively buffer the volume expansion of the V2O5 cathode to improve the cycling performance 2 of 10 [9,[26][27][28].…”

A journey into the electrochemistry of vanadium compounds

“…Cucumber-like MnO 2 nanoparticles-enriched V 2 O 5 /PEDOT (= poly-3,4(O CH 2 CH 2 O )thiophene) coaxial nanowires were synthesized by layer-by-layer assembly [281]. This heterostructured nanomaterial exhibited enhanced electrochemical cycling performance.…”

Nanoparticles Encapsulated in Porous Carbon Matrix Coated on Carbon Fibers: An Ultrastable Cathode for Li‐Ion Batteries

“…In the first cycle, the reduction peak at 3.4 V corresponds to a phase change from α-V2O5 to ε-Li0.5V2O5; and peaks at 3.1 V and 2.3 V are assigned to the formation of δ-LiV2O5 and ɤ-Li2V2O5, respectively. [19][20][21][22] In the delithiation process, three anodic peaks at 2.5, 3.3 and 3.5 V are revealed, and they are ascribed to the corresponding reversed phase transformations from ɤ-Li2V2O5 to δ-LiV2O5, ε-Li0.5V2O5, and α-V2O5, respectively [35] . The CV curves for the 2 nd and 5 th cycles resembled that of the 1 st cycle suggesting an excellent reversibility of the cycling process.…”