Electrochemical study of intercalated vanadyl phosphate

Dupré, Nicolas; Gaubicher, Joël; Angenault, J.; Quarton, M.

doi:10.1007/s10008-003-0456-y

Cited by 21 publications

(22 citation statements)

References 15 publications

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“…This improvement in the cycling performance may also be related to the larger interlayer space of VOPO 4 /POMA, (2.63 nm) which offers less hindrance to lithium diffusion through the film this happens due to a decrease in steric and electrostatic effects promoted by the larger interlamellar distance, although the amount of guest molecules, can hinder the electromigration of solvated lithium ions. In agreement with our findings, Dupre and co-authors [13] showed that the introduction of small molecules (formic acid and acetic acid) within the VOPO 4 structure induces an increase in the ionic diffusion coefficient. In addition, these 'pillaring' molecules enhance the battery lifetime as they are more stable within the inter-layer space.…”

Section: Discussionsupporting

confidence: 92%

“…These same authors also observed that sodium ion insertion into the inter-layer space leads to an improvement of the intercalation kinetics as well the cyclability [12]. In another work, it was demonstrated that the introduction of inter-layer species such as HCOOH and CH 3 COOH within the a-VOPO 4 structure induces an increase in the ionic diffusion coefficient [13]. Several works have focused their attention on the synthesis of conductive polymer/ transition metal oxide nanocomposites such as polyaniline, melanin or polypyrrole into V 2 O 5 or MoO 3 matrices, with an increase in the interlamellar distance, in order to investigate their application as electrode for lithium batteries [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 87%

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Synthesis and electrochemical properties of vanadyl phosphate di-hydrate/polyaniline derivatives hybrid films

Zampronio

Ferreira

Oliveira

2009

Journal of Non-Crystalline Solids

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 87%

Synthesis and electrochemical properties of vanadyl phosphate di-hydrate/polyaniline derivatives hybrid films

Zampronio

Ferreira

Oliveira

2009

Journal of Non-Crystalline Solids

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“…It was found that an intercalation of lithium into a I -VOPO 4 and a II -VOPO 4 leads to the same compound: a I -LiVOPO 4 [163]. To facilitate the intercalation of lithium, vanadyl phosphate preintercalated with neutral molecules (H 2 O, HCOOH, and CH 3 COOH) was used as the host material [164]. The interest in lithium containing vanadyl phosphates as materials for energy storage still persists as documented by recent publications on this topic, even the structure of the studied compounds differs from that of a-VOPO 4 [165][166][167].…”

Section: Redox Intercalation Of Inorganic Cationsmentioning

confidence: 99%

Intercalation chemistry of layered vanadyl phosphate: a review

Beneš

Melánová

Svoboda

et al. 2012

J Incl Phenom Macrocycl Chem

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The intercalation chemistry of layered a I modification of vanadyl phosphate and vanadyl phosphate dihydrate is reviewed. The focus is on neutral molecular guests and on metal cations used as guest species. The basic condition for the ability of the neutral molecules to be intercalated into vanadyl phosphate is a presence of an electron donor atom in them. The most commonly used guest compounds are those containing oxygen, nitrogen or sulfur as electron donor atoms. Regarding the molecules containing oxygen, various compounds were used as molecular guests starting from water to alcohols, ethers, aldehydes, ketones, carboxylic acids, lactones, and esters. An arrangement of the guest molecules in the interlayer space is discussed in connection with the data obtained by powder X-ray diffraction, thermogravimetry, IR and Raman spectroscopies, and solid-state NMR. In some cases, the local structure was suggested on the basis of quantum chemical calculations. Besides of those O-donor guests, also N-donor guests such as amines, nitriles and nitrogenous heterocycles and S-donor guests such as tetrathiafulvalene were intercalated into VOPO 4 . Also intercalates of complexes like ferrocene were prepared. Intercalation of cations is accompanied by a reduction of vanadium(V) to vanadium(IV). In this kind of intercalation reactions, an iodide of the intercalated cation is often used as it serves both as a mild reduction agent and as a source of the intercalated species. Intercalates of alkali metals, hydronium and ammonium were prepared and characterized. In the case of lithium and sodium intercalates, a staging phenomenon was observed. These redox intercalated vanadyl phosphates undergo ion exchange reactions which are discussed from the point of the nature of cations involved in the exchange. Vanadyl phosphates in which a part of vanadium atom is replaced by other metals are also briefly reviewed.

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“…176 This layered structure loses its water in two steps, with the lattice spacing decreasing from 7.11 A ˚to 6.3 A ˚and finally to 4.11 A ˚in the dehydrated phase. 177 This layered structure can intercalate lithium reversibly, giving a capacity of 100 mAh/g for the hydrate, which corresponds to 0.8 Li/VPO 4 ; the theoretical capacity of the dihydrate is 135 mAh/g. However, the capacity decayed rapidly on cycling, due to the presence of the water molecules, which released oxygen gas on charging above 3.9 V. The fully dehydrated phases showed a much lower capacity of around 50 mAh/g, probably due to the low ionic conductivity, just as found for protonic conductivity in the anhydrous material.…”

Section: Vanadyl Phosphatesmentioning

confidence: 99%