Facile Synthesis of Hierarchical Networks Composed of Highly Interconnected V₂O₅ Nanosheets Assembled on Carbon Nanotubes and Their Superior Lithium Storage Properties

Abstract

Guo, Z. (2013). Facile synthesis of hierarchical networks composed of highly interconnected V2O5 nanosheets assembled on carbon nanotubes and their superior lithium storage properties. ACS Applied Materials and Interfaces, 5 (23), 12394-12399. Facile synthesis of hierarchical networks composed of highly interconnected V2O5 nanosheets assembled on carbon nanotubes and their superior lithium storage properties AbstractHierarchical networks with highly interconnected V2O5 nanosheets (NSs) anchored on skeletons of carbon nanotubes (CNTs) are prepared by a facile hydrothermal treatment and a following calcination for the first time. Benefiting from these unique structural features, the as-prepared CNT@V2O5 material shows dramatically excellent electrochemical performance with remarkable long cyclability (137-116 mA h g-1 after 400 cycles) at various high rates (20 C to 30 C) and very good rate capability for highly reversible lithium storage. The excellent electrochemical performance suggests its promising use as a cathode material for future lithium-ion batteries. Benefiting from these unique structural features, the asprepared CNT@V 2 O 5 material shows dramatically excellent electrochemical performance with remarkable long cyclability (137−116 mA h g −1 after 400 cycles) at various high rates (20 C to 30 C) and very good rate capability for highly reversible lithium storage. The excellent electrochemical performance suggests its promising use as a cathode material for future lithium-ion batteries.

Template-free synthesis of ultra-large V2O5 nanosheets with exceptional small thickness for high-performance lithium-ion batteries

“…Nanostructured materials are believed to be an effective way to solve the problems because of the nanoscale effect, which includes the enlarged surface area, reduced Li + diffusion distance and shortened electron transportation distance. So far, various nanostructured materials have been fabricated to demonstrate the enhanced electrochemical performances, such as nanoarrays, [19] nanorods, [20] nanowires, [21] nanobelts, [22,23] nanosheets [8,24,25] and three-dimensional hollow micro/nanospheres [26]. Moreover, the surface energy and surface defects of the active material is believed to contribute to the superior electrochemical performances [27,28].…”

Self-template processed hierarchical V2O5 nanobelts as cathode for high performance lithium ion battery

“…Further insertion of the third lithium into V 2 O 5 leads to the irreversible formation of Li x V 2 O 5 (2<x≤3), which has a rock salt type structure fabricated from an irreversible electrochemical process below 2 V, implying poor durability in such a deep discharge process. The theoretical capacity of V 2 O 5 is 294 or 442 mAh g -1 corresponding to 2 or 3 lithium ions intercalation/de-intercalation per unit formula, showing higher capacity than that of conventional cathode materials [19][20][21]. However, the bulk V 2 O 5 as cathode materials of LIBs still suffer from low discharge capacity and fast capacity fading because of the low lithium ion diffusion efficiency, insufficient contact areas and poor structure stability [22][23][24].…”

Recent Advances in Nanostructured Vanadium Oxides and Composites for Energy Conversion

“…[162] Nanocomposites of CNTs and vanadium oxides were realized by modifying CNTs surfaces. [104,163] It is well known that CNTs can form a conductive network to improve the poor conductivity of vanadium oxides. [150a,156b,164] Also, the stacked nanowires can also improve the electron and ion transfer between electrolytes and electrodes.…”