Electrochemical behavior and structural changes of V2O5 xerogel

Huguenin, Fritz; Torresi, Roberto Manuel

doi:10.1590/s0103-50532003000400008

Cited by 11 publications

(11 citation statements)

References 39 publications

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“…Vanadium pentoxide gels serve as hosts for a wide array of cations such as Mg 2+ , Cu 2+ , Zn 2+ , Na + , and Li + and offer multiple redox potentials that make them attractive as cathodes for lithium-ion batteries (LIBs). − They can incorporate high amounts of lithium with capacities as high as 650 mAh/g for 5.8 Li + /V 2 O 5 . Water molecules are required to stabilize the large interlayer distance that allows several Li + to be intercalated. , However, practical applications of V 2 O 5 aerogels are hindered by their inability to maintain these high capacities over many cycles. − The poor capacity retention has been attributed to factors such as vanadium dissolution and volume changes. ,, Most of these studies, however, have not adequately accounted for the interaction of Li + with the inherent water molecules.…”

Section: Introductionmentioning

confidence: 99%

Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V₂O₅ Aerogel Cathodes

Wangoh¹,

Huang²,

Jezorek

et al. 2016

ACS Appl. Mater. Interfaces

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V2O5 aerogels are capable of reversibly intercalating more than 5 Li(+)/V2O5 but suffer from lifetime issues due to their poor capacity retention upon cycling. We employed a range of material characterization and electrochemical techniques along with atomic pair distribution function, X-ray photoelectron spectroscopy, and density functional theory to determine the origin of the capacity fading in V2O5 aerogel cathodes. In addition to the expected vanadium redox due to intercalation, we observed LiOH species that formed upon discharge and were only partially removed after charging, resulting in an accumulation of electrochemically inactive LiOH over each cycle. Our results indicate that the tightly bound water that is necessary for maintaining the aerogel structure is also inherently responsible for the capacity fade.

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Section: Introductionmentioning

confidence: 99%

Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V₂O₅ Aerogel Cathodes

Wangoh¹,

Huang²,

Jezorek

et al. 2016

ACS Appl. Mater. Interfaces

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“…[55][56][57][58] Among these vanadium derivatives, the layered vanadium pentoxide, LiV 2 O 5 has been the most studied in spite of its low discharge voltage, low electric conductivity and slow diffusion kinetics of lithium ion. 59,60 To improve the performance of cells employing vanadium pentoxide as cathode several tricks have been tested, including the use of aerogels, 61-63 xerogels, [64][65][66] nanocomposites of LiV 2 O 5 with electronically conducting organic polymers 17,60,[67][68][69][70][71][72][73][74][75][76][77][78] and nanostructured materials (nanotubes, nanorods and nanoparticles). [79][80][81] In general, nanotubes of V 2 O 5 are prepared by sol-gel method from the hydrolysis of vanadium (V) triisopropoxide.…”

Section: Vanadium Oxidesmentioning

confidence: 99%

Cathodes for lithium ion batteries: the benefits of using nanostructured materials

Camilo¹,

Torresi²

2006

J. Braz. Chem. Soc.

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As celas de íon lítio disponíveis comercialmente, as quais são as mais avançadas entre as baterias recarregáveis disponíveis até agora, empregam óxidos de metais de transição microcristalinos como catodos, os quais funcionam como matrizes de inserção de lítio. Em busca por uma melhor performance eletroquímica, o uso de nanomateriais no lugar dos materiais convencionais tem emergido como excelente alternativa. Nesta revisão nós apresentaremos uma breve introdução sobre as motivações de usar materiais nanoestruturados como catodos em baterias de íon-lítio. Para ilustrar tais vantagens apresentamos exemplos de pesquisas relacionadas com a preparação e dados eletroquímicos dos mais usados catodos em nanoescala, tais como LiCoO 2 , LiMn 2 O 4 , LiMnO 2 , LiV 2 O 5 e LiFePO 4 .Commercially available lithium ion cells, which are the most advanced among rechargeable batteries available so far, employ microcrystalline transition metal oxides as cathodes, which function as Li insertion hosts. In search for better electrochemical performance the use of nanomaterials in place of these conventional ones has emerged as excellent alternative. In this review we present a brief introduction about the motivations to use nanostructured materials as cathodes in lithium ion batteries. To illustrate such advantages we present some examples of research directed toward preparations and electrochemical data of the most used cathodes in nanoscale, such as LiCoO 2 , LiMn 2 O 4 , LiMnO 2 , LiV 2 O 5 e LiFePO 4 .Keywords: nanotechnology, lithium-ion battery, cathode, nanoparticles Initial RemarksSince Sony introduced its 18650 cell in 1990, 1 Li-ion batteries with excellent electrochemical performance have been manufactured and occupied a prime position in the market place 2 to power portable and non-portable devices. [3][4][5] The reason for this relevance is that compared to traditional rechargeable batteries such as, lead acid and Ni-Cd, the lithium-ion battery shows several advantages, such as lighter in weight, smaller in dimension and higher energy density. 1 Moreover, although capacity values may be similar to other rechargeable systems, voltages are approximately three times higher, affording higher energy. 1 In general, the commercial lithium-ion batteries use graphite-lithium composite, Li x C 6 , as anode, lithium cobalt oxide, LiCoO 2 , as cathode and a lithium-ion conducting electrolyte. When the cell is charged, lithium is extracted from the cathode and inserted at the anode. On discharge, the lithium ions are released by the anode and taken up again by the cathode (Figure 1).Owing to the importance of lithium ion batteries, these cells are still object of intense research to enhance their properties and characteristics. The searches focus on all aspects of these batteries, including improved anodes, 6-8 cathodes 9-17 and electrolytes. [18][19][20][21][22] However, most of these efforts are concentrated in new cathode materials, since the most used cathode material (LiCoO 2 ) is expensive and is somewhat toxic.The active catho...

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“…Lithium batteries are maybe the best alternative for creating light-weighted, high-throughput accumulator devices and thousands of different cathode/anode/ electrolyte materials combinations using these ions have been studied during the last decades, always aiming for performance improvement. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Cathode materials for lithium batteries have to overcome several issues, such as high price, low charge density and memory effect to cite a few, in order to be eligible for commercial applications. A very useful and common candidate for cathodes in such batteries is vanadium pentoxide (V 2 O 5 •nH 2 O), which can be prepared as a lamellar solid by drying its gels known as vanadium pentoxide xerogels (or VXG).…”

Section: Introductionmentioning

confidence: 99%

“…These oxygen atoms act as Lewis bases for hard Pearson acids as well as hydrogen bond acceptors towards several inclusion guest species, ammonium salts and metallic cations in general. 31,32 During its synthesis, many homologues are formed, ranging from CB [5] up to CB [10] (CB [9] was not isolated), which have the same structure except for the number of glycoluril units in the macrocycles. In spite of being the most abundant species, it is quite difficult to work with CB [6] due to solubility issues.…”

Section: Introductionmentioning

confidence: 99%

Lithium ion electrochemical insertion in vanadium pentoxide/cucurbit[6]uril intercalates

Silva

Huguenin

Lima

et al. 2014

Inorg. Chem. Front.

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Cucurbit [6]uril (CB[6]) and its complex with VO 2+ (CB[6]VO) were intercalated into lamellar vanadium pentoxide in several proportions, generating a series of hybrid pillarised intercalates in the form of xerogel films. These different guests dramatically affect Li + insertion/expulsion from the composites during redox processes. Our results show that CB[6] has little effect or may even impair charge compensation by Li + , while CB[6]VO exerts the opposite effect, enhancing this process when compared to pure vanadium pentoxide. This is clear evidence that CB[6] binds these ions retaining them in the bulk structure, and when the oculi are blocked by VO 2+ ions, the macrocycle acts as a non-coordinating pillar in the structure favoring ion traffic, and charge compensation processes become easier. Specific charge capacities for pure vanadium pentoxide, CB[6] and CB[6]VO intercalates correspond to 158, 168 and 230 mA h g −1 respectively. † Electronic supplementary information (ESI) available: FTIR and TGA analyses, AFM and SEM images, electrochemical data for the 5, 7 and 10% intercalates.

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Electrochemical behavior and structural changes of V2O5 xerogel

Cited by 11 publications

References 39 publications

Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V₂O₅ Aerogel Cathodes

Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V₂O₅ Aerogel Cathodes

Cathodes for lithium ion batteries: the benefits of using nanostructured materials

Lithium ion electrochemical insertion in vanadium pentoxide/cucurbit[6]uril intercalates

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Electrochemical behavior and structural changes of V2O5 xerogel

Cited by 11 publications

References 39 publications

Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V2O5 Aerogel Cathodes

Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V2O5 Aerogel Cathodes

Cathodes for lithium ion batteries: the benefits of using nanostructured materials

Lithium ion electrochemical insertion in vanadium pentoxide/cucurbit[6]uril intercalates

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Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V₂O₅ Aerogel Cathodes

Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V₂O₅ Aerogel Cathodes