<p>Electrospinning
has gained immense interests in recent years due to its potential application
in various fields, including energy storage application. The V<sub>2</sub>O<sub>5</sub>/GO
as a layered crystal structure has been demonstrated to fabricate nanofibers
with diameters within a range of ~300nm through electrospinning technique. The porous,
hollow, and interconnected nanostructures were produced by electrospinning formed
by polymers such as Polyvinylpyrrolidone (PVP) and Polyvinyl alcohol (PVA),
separately, as solvent polymers with electrospinning technique. </p>
<p> </p>
<p>In this study, we investigated the synthesis of a graphene-modified nanostructured V<sub>2</sub>O<sub>5</sub> through modified sol-gel method and electrospinning
of V<sub>2</sub>O<sub>5</sub>/GO hybrid. Electrochemical
characterization was performed by utilizing Arbin Battery cycler,
Field Emission Scanning Electron
Microscopy (FESEM), X-ray powder diffraction (XRD), Thermogravimetric analysis (TGA), Mercury Porosimetery, and BET surface area
measurement. </p>
<p> </p>
<p>As compared to the
other conventional fabrication methods, our optimized sol-gel method, followed
by the electrospinning of the cathode material achieved a high initial capacity
of <b>342 mAh/g</b> at a high current density of 0.5C (171 mA/g) and the
capacity retention of ~80% after 20 cycles. Also, the prepared sol-gel method
outperforms the pure V<sub>2</sub>O<sub>5 </sub>cathode material, by obtaining
the capacity almost two times higher.</p>
<p>The results of
this study showed that post-synthesis treatment of cathode material plays a prominent
role in electrochemical performance of the nanostructured vanadium oxides. By controlling the
annealing and drying steps, and time, a small amount of pyrolysis carbon can be
retained, which improves the conductivity of the V<sub>2</sub>O<sub>5</sub>
nanorods. Also, controlled post-synthesis helped us to prevent aggregation of
electro-spun twisted nanostructured fibers which deteriorates the lithium
diffusion process during charge/discharge of batteries.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/9037004 |
| Date | 17 December 2020 |
| Creators | Amirhossein Ahmadian (7035998) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/thesis/DESIGN_AND_FABRICATION_OF_HIGH_CAPACITY_LITHIUM-ION_BATTERIES_USING_ELECTRO-SPUN_GRAPHENE_MODIFIED_VANADIUM_PENTOXIDE_CATHODES/9037004 |
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