Mesoporous Hybrids of Reduced Graphene Oxide and Vanadium Pentoxide for Enhanced Performance in Lithium-Ion Batteries and Electrochemical Capacitors

Pandey, Gaind P.; Liu, Tao; Brown, Emery; Yang, Yiqun; Li, Yonghui; Sun, Xiuzhi Susan; Fang, Yueping; Li, Jun

doi:10.1021/acsami.6b02372

Cited by 76 publications

(25 citation statements)

References 60 publications

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“…The typical V 2 O 3 peaks in both bare and composite with rGO are found around 291.28, 414.55, 531.01, 687.60, 867.10, and 988.24 cm −1 , which belong to various modes of V−O bond vibrations ,,. V 2 O 3 is proven to undergo laser degradation easily and the observed peaks, in fact, belong to freshly formed V−O bonds of the V 2 O 5 structure ,,. However, the intensity of these V−O peaks seems to be amplified with the addition of 0.1 M of CA compared to bare V 2 O 3 /G (Figure (b)) in compliance with XRD results.…”

Section: Resultsmentioning

confidence: 99%

Citric Acid Assisted Solid State Synthesis of V₂O₃, V₂O₃/C and V₂O₃/Graphene Composites for Li‐ion Battery Anode Applications

Petnikota

Toh

et al. 2018

ChemElectroChem

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A series of V2O3, V2O3/C and V2O3/G composite powders are prepared by simply annealing the reaction mixture containing ammonium metavanadate (0.1 M), reduced graphene oxide (rGO, 0.1 M) and citric acid (CA, 0.0, 0.1, 0.3 and 0.5 M) at 500 °C for 8 h under Ar flow. A variety of characterization techniques are used to investigate the structural, physiochemical features and electrochemical performance of the powders. The reaction mixture without rGO led to the formation of V2O3 at 0.1 M of CA and V2O3/C at 0.3 and 0.5 M of CA. As anodes of lithium‐ion coin cell batteries, V2O3, V2O3/C and V2O3/G composite electrodes exhibit an increase in capacity with increasing concentrations of CA. The increase in capacity is mainly attributed to the carbonization of CA and the declining crystallinity of V2O3. V2O3/C and V2O3/G prepared at 0.5 M of CA outperformed all other control compounds. The V2O3/C and V2O3/G delivered reversible capacities of 585 and 420 mAh g−1 respectively, during the first cycle with a current density of 50 mA g−1. The respective capacities after few initial cycles continuously increased to 608 and 463 mAh g−1 at the end of the 100th cycle.

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Section: Resultsmentioning

confidence: 99%

Citric Acid Assisted Solid State Synthesis of V₂O₃, V₂O₃/C and V₂O₃/Graphene Composites for Li‐ion Battery Anode Applications

Petnikota

Toh

et al. 2018

ChemElectroChem

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“…At more than two Li + insertions, an irreversible transformation to rock‐salt‐type ω‐Li x V 2 O 5 phase (2 < x < 3) typically occurs . Such phase transition processes induce large lattice strains due to different crystal structures and lattice constants in distinct phases mixed within each single particles, which unavoidably causes irreversible structural damage resulting in poor battery life . The larger amount of Li insertion by 3 Li + / V 2 O 5 insertion makes such structural changes even more severe.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the low surface energy of V 2 O 5 often leads to aggregation of the nanostructures, resulting in capacity fading and ultimately structural collapse. The second strategy (combined with the first strategy) is to incorporate low‐dimensional conductive carbon materials such as multiwall carbon nanotubes (MWCNTs), graphene, and reduced graphene oxide to form composite materials. The addition of these conductive additives prevents aggregation and enhances the electrical conductivity throughout the electrode material.…”

Section: Introductionmentioning

confidence: 99%

Highly Stable Three Lithium Insertion in Thin V₂O₅ Shells on Vertically Aligned Carbon Nanofiber Arrays for Ultrahigh‐Capacity Lithium Ion Battery Cathodes

Brown

Acharya

Pandey

et al. 2016

Adv Materials Inter

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factor limiting the energy storage capability of LIBs. [5] For example, in the most common commercial LIBs, a near theoretical specific capacity of 372 mAh g −1 can be achieved with the graphite anode while only ≈140 mAh g −1 specific capacity with LiCoO 2 cathode. [5] Hence, the current LIB research has put an extensive emphasis on improving the charge storage capacity and power delivery capability of the cathode materials. [6,7] Vanadium pentoxide (V 2 O 5 ) is regarded as a promising cathode material owing to its high theoretical capacity due to multiple Li + insertion/extraction reactions in addition to the low cost, nontoxic chemical properties, high electrode potential in lithium-extracted state (up to 4.0 V), and easily accessible layered structure for Li + ion insertion. [8] Theoretically, crystalline V 2 O 5 can achieve a reversible specific capacity of 294 mAh g −1 (for a two Li + / V 2 O 5 insertion process) and an irreversible capacity of 441 mAh g −1 (for a 3 Li + /V 2 O 5 insertion process), [9] which are significantly higher than today's commercial cathode materials such as LiCoO 2 (140 mAh g −1 ), LiMn 2 O 4 (148 mAh g −1 ), and LiFePO 4 (170 mAh g −1 ) [10] that are limited to only one Li + insertion/extraction. A few reports have even suggested that amorphous V 2 O 5 in supercritically dried xerogels and aerogels can achieve extremely high capacities up to 560 and 650 mAh g −1 , respectively (equivalent to 4 and 5.8 Li + insertion/extraction per V 2 O 5 ), owing to their highly porous network, high surface area, and short Li + diffusion paths. [11,12] Unfortunately, these materials suffer from poor mechanical/ chemical stability and rapid capacity fading, making it difficult to realize the predicted high capacity in practical LIBs.Achieving reliable capacity with V 2 O 5 cathodes close to the theoretical value has been a challenge due to the small Li + ion diffusion coefficients (≈10 −15 to 10 −12 cm 2 s −1 ) and low electrical conductivities (≈10 −3 to 10 −5 S cm −1 ) in this material, which ultimately hinder the performance of V 2 O 5 cathodes in practical EES devices. [13,14] Also, it is well known that the Li + intercalation process in crystalline V 2 O 5 is accompanied by multiple phase transitions. Trace amounts of Li + intercalation result in α-Li x V 2 O 5 (x < 0.01) structure, which is transformed into ε-Li x V 2 O 5 (0.35 < x < 0.7) after further lithiation. Insertion of exactly one Li + leads to the formation of δ-phase Li x V 2 O 5 (x = 1). Further lithiation converts the δ-phase to γ-Li x V 2 O 5 (1 < x < 2).Here the authors demonstrate an approach to achieving stable 3 Li + insertion into vanadium pentoxide (V 2 O 5 ) by implementing a 3D core-shell structure consisting of coaxial V 2 O 5 shells sputter-coated on vertically aligned carbon nanofiber cores. The hydrated amorphous microporous structure in the "asdeposited" V 2 O 5 shells and the particulated nanocrystalline V 2 O 5 structure formed by thermal annealing are compared. The former provides remarkably high capacities of 36...

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“…The small charge transfer resistance indicates a very fast charge-transport rate, which is in good agreement with CV and high current charge–discharge studies. 36 …”

Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide as a Monolithic Multifunctional Conductive Binder for Activated Carbon Supercapacitors

et al. 2018

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Using reduced graphene oxide (r-GO) as a multifunctional conductive binder, a simple, cost-effective, and environmentally friendly approach is developed to fabricate activated carbon/reduced graphene oxide (AC/r-GO) composite electrodes for supercapacitors with outstanding performance. In such a composite, r-GO provides several much needed critical functions: r-GO not only serves as the binder material improving the AC particle/particle cohesion and electrode-film/substrate adhesion but also improves the electrical conductivity of the composite and provides additional surfaces for ion adsorption. Furthermore, during electrode fabrication, initial GO precursor functions as an effective dispersant for AC, resulting in a stable electrode material slurry. Employing characterization by advanced microscopy techniques, we show that AC and r-GO assemble into an interconnected network structure, resulting in a composite with high specific capacitance, excellent rate capability, and long cycling life stability. Such high-performance electrodes coupled with their relatively simple, scalable, and low-cost fabrication process thereby provide a clear pathway toward large-scale implementation of supercapacitors.

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Mesoporous Hybrids of Reduced Graphene Oxide and Vanadium Pentoxide for Enhanced Performance in Lithium-Ion Batteries and Electrochemical Capacitors

Cited by 76 publications

References 60 publications

Citric Acid Assisted Solid State Synthesis of V₂O₃, V₂O₃/C and V₂O₃/Graphene Composites for Li‐ion Battery Anode Applications

Citric Acid Assisted Solid State Synthesis of V₂O₃, V₂O₃/C and V₂O₃/Graphene Composites for Li‐ion Battery Anode Applications

Highly Stable Three Lithium Insertion in Thin V₂O₅ Shells on Vertically Aligned Carbon Nanofiber Arrays for Ultrahigh‐Capacity Lithium Ion Battery Cathodes

Reduced Graphene Oxide as a Monolithic Multifunctional Conductive Binder for Activated Carbon Supercapacitors

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Mesoporous Hybrids of Reduced Graphene Oxide and Vanadium Pentoxide for Enhanced Performance in Lithium-Ion Batteries and Electrochemical Capacitors

Cited by 76 publications

References 60 publications

Citric Acid Assisted Solid State Synthesis of V2O3, V2O3/C and V2O3/Graphene Composites for Li‐ion Battery Anode Applications

Citric Acid Assisted Solid State Synthesis of V2O3, V2O3/C and V2O3/Graphene Composites for Li‐ion Battery Anode Applications

Highly Stable Three Lithium Insertion in Thin V2O5 Shells on Vertically Aligned Carbon Nanofiber Arrays for Ultrahigh‐Capacity Lithium Ion Battery Cathodes

Reduced Graphene Oxide as a Monolithic Multifunctional Conductive Binder for Activated Carbon Supercapacitors

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Citric Acid Assisted Solid State Synthesis of V₂O₃, V₂O₃/C and V₂O₃/Graphene Composites for Li‐ion Battery Anode Applications

Citric Acid Assisted Solid State Synthesis of V₂O₃, V₂O₃/C and V₂O₃/Graphene Composites for Li‐ion Battery Anode Applications

Highly Stable Three Lithium Insertion in Thin V₂O₅ Shells on Vertically Aligned Carbon Nanofiber Arrays for Ultrahigh‐Capacity Lithium Ion Battery Cathodes