Improved lithium capacity of defective V2O5 materials

Swider‐Lyons, Karen; Love, Corey T.; Rolison, Debra R.

doi:10.1016/s0167-2738(02)00350-8

Cited by 121 publications

(99 citation statements)

References 14 publications

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“…This effect delays the significant influence of the concentration polarization in the solid state to higher discharge currents, resulting in better rate capabilities and higher specific charge at high discharge rates. 21,25 Fig. 7 Galvanostatic cycling behaviour of V2O5 electrodes for nanoparticles (here FSP-6) and for microparticles (Aldrich): (a) cycling at a specific current of 100 mA g −1 , and (b) consecutive cycling at different specific currents.…”

Section: Figmentioning

confidence: 99%

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Flame spray-pyrolyzed vanadium oxide nanoparticles for lithium battery cathodes

Patey

Büchel

et al. 2009

Phys. Chem. Chem. Phys.

116

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Vanadium pentoxide (V2O5) nanoparticles (30-60 nm) were made by a one-step and scalable flame spray pyrolysis (FSP) process. Optimization of the FSP processing conditions (precursor concentration and injection rate) enhanced the electrochemical performance of these nanoparticles. Increasing the cut-off potential for discharging from 1.5 to 2.5 V vs. Li/Li + improved the cycle life of these V2O5 nanoparticles. Particles with the lowest specific surface area ( 32 m 2 g −1 ) and highest phase purity (up to 98 wt%) showed excellent cyclability between 2.5 and 4.0 V vs. Li/Li + , retaining a specific charge of 110 mAh g −1 beyond 100 cycles at a specific current of 100 mA g −1 , and also superior specific charge of 100 mAh g −1 at specific current up to 20C rate (or 2000 mA g −1 ).

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Section: Figmentioning

confidence: 99%

“…[21][22][23][24][25] These studies showed that crystalline V2O5 has a high specific charge but has poor cycle life behaviour since its crystal structure is damaged by prolonged charge/discharge cycles. Meanwhile, amorphous and low crystallinity V2O5 allows faster lithium-ion diffusion and displays superior cyclability.…”

Section: Introductionmentioning

confidence: 99%

Flame spray-pyrolyzed vanadium oxide nanoparticles for lithium battery cathodes

Patey

Büchel

et al. 2009

Phys. Chem. Chem. Phys.

116

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“…36 To help resolve the nature of the increased Li-ion capacity obtained with V 2 O 5 in aerogel form, Swider-Lyons et al turned to classic solid-state-ionics protocol to induce various point defects in micrometer-sized V 2 O 5 polycrystalline powders. 37 Various temperature/atmosphere treatments were used to control the nature of vacancies within the initial orthorhombic crystalline habit, which signifi cantly affected the Li-ion capacities of the treated powders as measured in a standard powder composite electrode structure, Figure 9 . Oxygen (anion) vacancies and Schottky defects (anion and cation vacancies) lowered the lithium-ion capacity relative to composite electrodes prepared with the as-received polycrystalline material.…”

Section: +mentioning

confidence: 99%

Electrochemical energy storage to power the 21st century

2011

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Section: Vanadium Oxidesmentioning

confidence: 99%

“…When this compound is heated above 350 o C, it begins to transform irreversibly to the more stable rutile VO 2 (R) as revealed by XRD data, which is not an attractive cathode. 99 Because of this, the methodology to synthesize VO 2 (B) is the key point and the search for new methods is still object of interest.Following this conventional methodology, VO 2 (B) metastable was prepared using two different reducting agents, such as KBH 4 and sodium dithionite. 56,100 The observed capacities were higher than that of bulk VO 2 (B).…”

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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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Improved lithium capacity of defective V2O5 materials

Cited by 121 publications

References 14 publications

Flame spray-pyrolyzed vanadium oxide nanoparticles for lithium battery cathodes

Flame spray-pyrolyzed vanadium oxide nanoparticles for lithium battery cathodes

Electrochemical energy storage to power the 21st century

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

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