Extremely stable cycling of ultra-thin V2O5 nanowire–graphene electrodes for lithium rechargeable battery cathodes

Abstract

Vanadium pentoxide (V 2 O 5 ) has received considerable attention as a lithium battery cathode because its specific capacity (>250 mA h g À1 ) is higher than those (<170 mA h g À1 ) of most commercial cathode materials. Despite this conspicuous advantage, V 2 O 5 has suffered from limited cycle life, typically below a couple of hundred cycles due to the agglomeration of its particles. Once V 2 O 5 particles are agglomerated, the insulating phases continuously expand to an extent that ionic and electronic conduction is severely deteriorated, leading to the significant capacity decay. In this study, in order to overcome the agglomeration issue, the electrodes were uniquely designed such that ultrathin V 2 O 5 nanowires were uniformly incorporated into graphene paper. In this composite structure, the dispersion of V 2 O 5 nanowires was preserved in a robust manner, and, as a result, enabled substantially improved cycle life: decent specific capacities were preserved over 100 000 cycles, which are 2-3 orders of magnitude larger than those of typical battery materials.

Vanadium-based nanostructure materials for secondary lithium battery applications

“…[29][30][31] For instance, Pan et al into 1D CNTs, [32][33][34][35] 2D graphenes, [36][37][38] etc. In this regard, Rui et al 39 hybridized reduced graphene oxide (rGO) with highly porous V 2 O 5 spheres (denoted as V 2 O 5 /rGO) using a simple solvothermal method, as shown in Fig.…”

Recent Advances in Nanostructured Vanadium Oxides and Composites for Energy Conversion

“…As shown in Figure 14b,c, V 2 O 5 /rGO stacked structures with 15 wt% V 2 O 5 have high specific capacity and outstanding cycling performance, the specific capacity of approximately 200 mA h g −1 was reported using this structure after 3000 cycles. [159] V 2 O 5 was also fabricated on rGO nanosheets to form composite structures. [160] As shown in Figure 14d, V 2 O 5 nanoparticles were fabricated on rGO layers for anodic applications in LIBs.…”

Vanadium-oxide-based electrode materials for Li-ion batteries

“…[161] Graphene is a monolayer carbon sheet with the honeycomb (hexagonal) lattice of sp 2 -bonded carbon atoms. [162] Graphene has been considered as an extraordinary carbon since its discovery, due to the high electric conductivity of 10 , strong mechanical strength, and high chemical stability.…”

“…[164,165] Graphene has been employed to hybrid with V2O5 nanostructures via various strategies to improve the electrochemical performance for LIBs. [110,148,161,[166][167][168] V2O5 nanowires were homogeneously integrated with graphene sheets to form a robust V2O5 nanowire-graphene composite paper via a simple vacuum filtration process. [161] Individual preparations were conducted for graphene oxides by a modified Hummer's method [169] and V2O5 nanowires by a hydrothermal treatment process.…”

“…[110,148,161,[166][167][168] V2O5 nanowires were homogeneously integrated with graphene sheets to form a robust V2O5 nanowire-graphene composite paper via a simple vacuum filtration process. [161] Individual preparations were conducted for graphene oxides by a modified Hummer's method [169] and V2O5 nanowires by a hydrothermal treatment process. The uniform mixture of graphene and V2O5 nanowires were filtered to obtain a V2O5 nanowire-GO composite paper.…”