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New High Capacity Cathode Materials for Rechargeable Li-ion Batteries: Vanadate-Borate Glasses

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ABSTRACT

V2O5 based materials are attractive cathode alternatives due to the many oxidation state switches of vanadium bringing about a high theoretical specific capacity. However, significant capacity losses are eminent for crystalline V2O5 phases related to the irreversible phase transformations and/or vanadium dissolution starting from the first discharge cycle. These problems can be circumvented if amorphous or glassy vanadium oxide phases are employed. Here, we demonstrate vanadate-borate glasses as high capacity cathode materials for rechargeable Li-ion batteries for the first time. The composite electrodes of V2O5 – LiBO2 glass with reduced graphite oxide (RGO) deliver specific energies around 1000 Wh/kg and retain high specific capacities in the range of ~ 300 mAh/g for the first 100 cycles. V2O5 – LiBO2 glasses are considered as promising cathode materials for rechargeable Li-ion batteries fabricated through rather simple and cost-efficient methods.

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Scanning electron microscopy (SEM) images of the V2O5 – LiBO2 glass displaying (a) a side view of glass disk, (b) an overview of a ground sample showing micron – sub-micron sized glass particles; Transmission electron microscopy images (TEM) displaying (c) an agglomerate of V2O5 – LiBO2 glass particles, (d) the amorphous nature of the V2O5 – LiBO2 glass, (e) the RGO/V2O5 – LiBO2 glass composite with a fine coating of reduced graphite oxide (RGO).
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f2: Scanning electron microscopy (SEM) images of the V2O5 – LiBO2 glass displaying (a) a side view of glass disk, (b) an overview of a ground sample showing micron – sub-micron sized glass particles; Transmission electron microscopy images (TEM) displaying (c) an agglomerate of V2O5 – LiBO2 glass particles, (d) the amorphous nature of the V2O5 – LiBO2 glass, (e) the RGO/V2O5 – LiBO2 glass composite with a fine coating of reduced graphite oxide (RGO).

Mentions: Scanning electron microscopy (SEM) images of the V2O5 – LiBO2 glass are displayed in Fig. 2. When the glass forming melt is quenched, a homogeneous disk of glass is obtained. Fig. 2a depicts a side image of V2O5 – LiBO2 glass disk with a thickness of ~ 200 microns. The homogenous nature can also be observed under an optical microscope with a gleaming purple appearance similar to volcanic glass. These large glass pieces have to be grinded in order to make further characterizations and to form electrodes of the material. The particles can be crushed down to a spread between micron and sub-micron size (Fig. 2b) in an agate mortar by extensive grinding. Yet, some large pieces of 40–50 microns in size are still present (Fig. 2b).


New High Capacity Cathode Materials for Rechargeable Li-ion Batteries: Vanadate-Borate Glasses
Scanning electron microscopy (SEM) images of the V2O5 – LiBO2 glass displaying (a) a side view of glass disk, (b) an overview of a ground sample showing micron – sub-micron sized glass particles; Transmission electron microscopy images (TEM) displaying (c) an agglomerate of V2O5 – LiBO2 glass particles, (d) the amorphous nature of the V2O5 – LiBO2 glass, (e) the RGO/V2O5 – LiBO2 glass composite with a fine coating of reduced graphite oxide (RGO).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5382707&req=5

f2: Scanning electron microscopy (SEM) images of the V2O5 – LiBO2 glass displaying (a) a side view of glass disk, (b) an overview of a ground sample showing micron – sub-micron sized glass particles; Transmission electron microscopy images (TEM) displaying (c) an agglomerate of V2O5 – LiBO2 glass particles, (d) the amorphous nature of the V2O5 – LiBO2 glass, (e) the RGO/V2O5 – LiBO2 glass composite with a fine coating of reduced graphite oxide (RGO).
Mentions: Scanning electron microscopy (SEM) images of the V2O5 – LiBO2 glass are displayed in Fig. 2. When the glass forming melt is quenched, a homogeneous disk of glass is obtained. Fig. 2a depicts a side image of V2O5 – LiBO2 glass disk with a thickness of ~ 200 microns. The homogenous nature can also be observed under an optical microscope with a gleaming purple appearance similar to volcanic glass. These large glass pieces have to be grinded in order to make further characterizations and to form electrodes of the material. The particles can be crushed down to a spread between micron and sub-micron size (Fig. 2b) in an agate mortar by extensive grinding. Yet, some large pieces of 40–50 microns in size are still present (Fig. 2b).

View Article: PubMed Central - PubMed

ABSTRACT

V2O5 based materials are attractive cathode alternatives due to the many oxidation state switches of vanadium bringing about a high theoretical specific capacity. However, significant capacity losses are eminent for crystalline V2O5 phases related to the irreversible phase transformations and/or vanadium dissolution starting from the first discharge cycle. These problems can be circumvented if amorphous or glassy vanadium oxide phases are employed. Here, we demonstrate vanadate-borate glasses as high capacity cathode materials for rechargeable Li-ion batteries for the first time. The composite electrodes of V2O5 – LiBO2 glass with reduced graphite oxide (RGO) deliver specific energies around 1000 Wh/kg and retain high specific capacities in the range of ~ 300 mAh/g for the first 100 cycles. V2O5 – LiBO2 glasses are considered as promising cathode materials for rechargeable Li-ion batteries fabricated through rather simple and cost-efficient methods.

No MeSH data available.


Related in: MedlinePlus