Vanadium Oxide Nanofibers and Vanadium Oxide Polyaniline Nanocomposite: Preparation, Characterization and Electrochemical Behavior

2003 ◽  
Vol 788 ◽  
Author(s):  
Samuel T. Lutta ◽  
Hong Dong ◽  
Peter Y. Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Vanadium Oxide ◽  
Hydrothermal Treatment ◽  
Electrochemical Behavior ◽  
Lithium Battery ◽  
Sol Gel ◽  
Active Material ◽  
Vanadium Oxides ◽  
Rechargeable Lithium Battery ◽  
Mixed Carbonate ◽  
Polyaniline Nanocomposite

ABSTRACTThe sol gel reaction of NH4VO3 and polymethylmethacrylate (PMMA) template followed by hydrothermal treatment formed (NH4)xV2O5-Δ.nH2O rods. TGA, SEM, XRD and FTIR characterized this compound. Heating (NH4)xV2O5-Δ.nH2O in oxygen and nitrogen at 250 °C and 300 °C respectively resulted in the formation of vanadium oxides nanofibers of V3O7 and V2O5. Performance of these compounds as cathode in rechargeable lithium battery was investigated in a LiPF6/mixed carbonate electrolyte. The materials show good cycling with capacity greater than 130mAh/g, which translates to the insertion of 0.5 moles of Li+ per vanadium of the active material.

Synthesis of Novel Vanadium Oxide Nanotubes and Nanofibers

2002 ◽  
Vol 740 ◽  
Author(s):  
Samuel T. Lutta ◽  
Hong Dong ◽  
Peter Y. Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Thermal Analysis ◽  
Vanadium Oxide ◽  
Electrochemical Behavior ◽  
Redox Reactions ◽  
Sol Gel ◽  
Vanadium Oxides ◽  
Organic Polymer ◽  
Fibrous Morphology ◽  
Surfactant Templates ◽  
Vanadium Oxide Nanotubes

ABSTRACTWe are exploring the synthesis and properties of structured vanadium oxides mainly nanotubes and nanorods. Nanotubes initially formed with surfactant templates have been readily exchanged with simple cations without change of the basal-plane structure. These compounds contain d-like vanadium oxide layers with the vanadium in VO6 octahedra. This structure is particularly suitable for redox reactions. In this paper we report on synthesis of vanadium oxide, (NH4)xV2O5-d·nH2O rods using organic polymer as template. This compound has been synthesized by sol-gel reaction and subsequent hydrothermal treatment. TGA, SEM, XRD and FTIR were used to characterize this compound. Thermal analysis of this compound shows that the fibrous morphology is maintained when it is heated in nitrogen and oxygen above 300 °C. However, in both cases the size of the fibers decreases. Performance of this compound as cathode material in secondary electrolyte has been investigated using LiPF6 as electrolyte. A capacity of 140 mAh/g was obtained which remained fairly constant with up to at least 10 cycles. We also investigated electrochemical behavior of thermal products.

Vanadium Oxide Nanotubes with Diamine Templates

1999 ◽  
Vol 581 ◽  
Author(s):  
F. Krumeich ◽  
H.-J. Muhr ◽  
M. Niederberger ◽  
F. Bieri ◽  
M. Reinoso ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Hydrothermal Treatment ◽  
Sol Gel ◽  
Exchange Reactions ◽  
Thin Walls ◽  
Synthesis Routes ◽  
High Yields ◽  
Vanadium Oxide Nanotubes ◽  
Tubular Morphology

ABSTRACTDiamine vanadium oxide nanotubes (DA-VOx-NTs) have been prepared in high yields applying two different synthesis routes, namely either a sol-gel reaction followed by a hydrothermal treatment or an exchange reaction. The first route is analogous to the well-known preparation of VOx-NTs containing monoamines: a vanadium(V) alkoxide is mixed with an α, ω- diamine (H2N[CH2]nNH2 with 12≤n≤20), the resulting adduct is hydrolyzed, and, after aging, a hydrothermal treatment leads to the nanotubes in pure form. The exchange of the monoamine template in VOx-NTs against diamines represents an alternative access to DA-VOx-NTs. This reaction occurs readily and is also applicable for diamines with short CH 2 chains like, e.g., in ethylene diamine. The TEM characterization of the DA-VOx-NTs confirms the tubular morphology which is widely preserved in the products of the exchange reactions. The characteristic feature of as-synthesized DA-VOx-NTs is a thick tube wall with many VO, layers while the exchange products are tubes comprising thin walls or bent packs of layers.

Promising Porous Cu2ZnSnS4 Electrode Composition Synthesized by Acetate Route-Based Sol-Gel Process for Lithium Battery Application

2021 ◽  
Author(s):  
Muhammad Amirul Aizat Mohd Abdah ◽  
Muhammad Ramiey Rejab ◽  
Marliyana Mokhtar ◽  
Kamaruzaman Sopian ◽  
Azizan Ahmad ◽  
...  
Keyword(s):  
Lithium Battery ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Electrode Composition ◽  
Battery Application

Macroporous LiFePO4 as a cathode for an aqueous rechargeable lithium battery of high energy density

2013 ◽  
Vol 1 (46) ◽  
pp. 14713 ◽  
Author(s):  
Yuyang Hou ◽  
Xujiong Wang ◽  
Yusong Zhu ◽  
Chenglin Hu ◽  
Zheng Chang ◽  
...  
Keyword(s):  
Energy Density ◽  
Lithium Battery ◽  
High Energy ◽  
High Energy Density ◽  
Rechargeable Lithium Battery
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