Electrochemical Behavior of Vanadium Oxides in (NH2)2CO - KCl Melt

2013 ◽  
Vol 50 (11) ◽  
pp. 153-157
Author(s):  
A. V. Savchuk ◽  
S. V. Devyatkin
Keyword(s):  
Electrochemical Behavior ◽  
Vanadium Oxides

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.

Synthesis and Characterization of Nickel and Manganese Vanadium Oxides

1998 ◽  
Vol 548 ◽  
Author(s):  
Fan Zhang ◽  
Peter Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Electron Microprobe ◽  
Electrochemical Behavior ◽  
Vanadium Oxides ◽  
Synthesis And Characterization ◽  
Monoclinic Structure ◽  
Hydrothermal Reactions ◽  
Lithium Cells

ABSTRACTWe have synthesized novel nickel and manganese vanadium oxides using the hydrothermal reactions of vanadium(V) pentoxide, Ni(CH3COO)2, and MnSO4 with an organic templating cation at 165°C. The [NH2(CH2)2NH2]2NiV6O14 has a monoclinic structure. It has some disordered V and 0 atoms in the V6014 layer, which appear to be very close to each other with occupation factor around 0.5. The disordered model was decomposed for two ordered configurations, which differ in the stacking of the layers. The (Mn+2)6(Mn+3)l−2/3z(OH)3(1−Z)(VO4)3[(VO4)l−2z(v207)z] (Z≈0. 1) phase has a hexagonal pipe morphology. These compounds were also characterized by electron microprobe, FTIR and TGA. They reacted readily with lithium, and their electrochemical behavior in lithium cells was determined.

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.

scholarly journals Studies on phase and morphological evolution of silver vanadium oxides as a function of pH: evaluation of electrochemical behavior towards quantification of Pb2+ and Cd2+ ions

2017 ◽  
Vol 4 (8) ◽  
pp. 085039 ◽  
Author(s):  
Vijayakumar Gangaiah ◽  
Prashanth Shivappa Adarakatti ◽  
Ashoka Siddaramanna ◽  
Pandurangappa Malingappa ◽  
Gujjarahalli Thimmanna Chandrappa
Keyword(s):  
Electrochemical Behavior ◽  
Morphological Evolution ◽  
Vanadium Oxides

Synthesis and Characterization of Manganese Vanadium Oxides as Cathodes in Lithium Batteries

1999 ◽  
Vol 581 ◽  
Author(s):  
Fan Zhang ◽  
Peter Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Hydrothermal Method ◽  
Electron Microprobe ◽  
Lithium Batteries ◽  
Electrochemical Behavior ◽  
Vanadium Oxides ◽  
Synthesis And Characterization ◽  
Nano Materials ◽  
Monoclinic Structure ◽  
Hydrothermal Reactions

ABSTRACTOur research on new cathode nano-materials for advanced lithium batteries has focused on the hydrothermal method for synthesis. We have synthesized two novel manganese vanadium oxides using the hydrothermal reactions of vanadium (V) pentoxide, [N(CH3)4]MnO4, and MnSO4 with an organic templating cation at 165°C. The 6-type [N(CH3)4]zMnyV2O5*nH2O has a monoclinic structure, a= 11.66(2)Å, b=3.610(9)Å, c= 13.91(4)Å, β= 108.8(2)°. It has a disordered V2O5 double layer and the Mn and N(CH3)4 ions reside between the layers. The γ-type MnV2O5 is orthorhombic, belongs to the space group Pnma, a=9.7585(2) Å, b=3.5825(l)Å, c= 11.2653(2) Å. These compounds were also characterized by electron microprobe, FTIR and TGA. They reacted readily with lithium, and their electrochemical behavior in lithium cells was determined.

Electrochemical behavior of self-assembled monolayers based on functionalized oligothiophenes

1998 ◽  
Vol 95 (6) ◽  
pp. 1339-1342 ◽  
Author(s):  
R. Michalitsch ◽  
A. El Kassmi ◽  
P. Lang ◽  
A. Yassar ◽  
F. Garnier
Keyword(s):  
Electrochemical Behavior ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled
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