Novel olivine and spinel LiMAsO4 (M=3d-metal) as positive electrode materials in lithium cells

Dompablo, M. Elena Arroyo-de; Amador, Ulises; Alvarez, Mario; Gallardo, José M.; Garcı́a-Alvarado, F.

doi:10.1016/j.ssi.2006.02.004

Cited by 21 publications

(14 citation statements)

References 9 publications

(16 reference statements)

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“…[1][2][3][4] Among them, LiFePO 4 was most frequently studied because of its environmental friendliness, low cost, and low toxicity. The main drawback of this material is its poor intrinsic transport properties 4-6 which prevent the intensive use of LiFePO 4 as a battery cathode without further treatment.…”

mentioning

confidence: 99%

Delithiation Study of LiFePO[sub 4] Crystals Using Electron Energy-Loss Spectroscopy

Sigle¹,

Amin²,

Weichert³

et al. 2009

Electrochem. Solid-State Lett.

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There is still some controversy about the mechanisms responsible for the delithiation of LiFePO 4 . We studied the delithiation of both large single crystals and powder by electron energy-loss spectroscopy. It is shown that Li depletion leads to a change in the Fe valency, to an enhanced prepeak at the O K edge, and to a pronounced interband transition peak between 4 and 6 eV. Exploiting these spectral changes, the delithiation process was monitored, with the result that in the large single crystal, delithiation takes place by removal of Li from the surface-near region, whereas in small particles, Li is removed from the particle core.

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mentioning

confidence: 99%

Delithiation Study of LiFePO[sub 4] Crystals Using Electron Energy-Loss Spectroscopy

Sigle¹,

Amin²,

Weichert³

et al. 2009

Electrochem. Solid-State Lett.

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“…On the other hand, the crystallographic studies [20,25] show that the substitution of cobalt by aluminum allows to increase the unit cell parameters and the dimensions of the tunnel sections. In fact, the volume of the unit cell of Na 4 Co 7 (AsO 4 ) 6 is V=1019.65(16) Å 3 which is lower than those of Na 4…”

Section: Alkali Transport Pathways Simulationmentioning

confidence: 99%

“…Other arsenate materials belonging to the same structural type have been synthesized [18][19][20][21][22][23][24]. Especially, LiCoAsO 4 arsenate with olivine structure [25] shows interesting electrochemical properties. Where, Li-ions was reversibly deinserted/inserted from/into material at average voltages of 4.8 and 4.6 V respectively.…”

Section: Introductionmentioning

confidence: 99%

Electrical properties and alkali-pathways simulation of new mixed conductor Na₄Li_0.62Co_5.67Al_0.71(AsO₄)₆

Marzouki

2020

Mater. Res. Express

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Polycrystalline sodium lithium-cobalt-aluminum arsenate, Na 4 Li 0.62 Co 5.67 Al 0.71 (AsO 4 ) 6 , was synthesized by solid state reaction route and characterized by infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The title material is a member of β-Xenophyllite family which show 3D anionic framework with interconnecting tunnels where alkali-ion are located. Dense ceramic with relative density of 97% is obtained after planetary grinding of the synthesized powder followed by optimal sintering at 1113 K. The effect of grinding on microstructure of sample is controlled by Scanning Electron Microscope (SEM). The electrical study using impedance spectroscopy, in the 443-773 K temperature interval, show interesting electrical performance of the dense ceramic: σ 433K =1.41 10 -5 Scm −1 and the activation energy Ea=0.449 eV. The alkali migration pathways in the anionic framework were simulated using Bond Valence Site Energy (BVSE) model to correlate structure with electrical properties of the studied material. The calculation results were compared to other β-Xenophyllite materials.

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“…More recently, in a series of studies arsenate analogs have been synthesized [8][9][10]. But, until today phosphate compounds are more studied as cathodes [11,12] compared to arsenate and this is perhaps due to the toxicity of arsenic III (As 2 O 3 ).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Electrical Properties and Na+ Migration Pathways of Na2CuP1.5As0.5O7

ALQarni

Marzouki

Smida³

et al. 2020

Processes

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A new member of sodium metal diphosphate-diarsenate, Na2CuP1.5As0.5O7, was synthesized as polycrystalline powder by a solid-state route. X-ray diffraction followed by Rietveld refinement show that the studied material, isostructural with β-Na2CuP2O7, crystallizes in the monoclinic system of the C2/c space group with the unit cell parameters a = 14.798(2) Å; b = 5.729(3) Å; c = 8.075(2) Å; β = 115.00(3)°. The structure of the studied material is formed by Cu2P4O15 groups connected via oxygen atoms that results in infinite chains, wavy saw-toothed along the [001] direction, with Na+ ions located in the inter-chain space. Thermal study using DSC analysis shows that the studied material is stable up to the melting point at 688 °C. The electrical investigation, using impedance spectroscopy in the 260–380 °C temperature range, shows that the Na2CuP1.5As0.5O7 compound is a fast-ion conductor with σ350 °C = 2.28 10−5 Scm−1 and Ea = 0.6 eV. Na+ ions pathways simulation using bond-valence site energy (BVSE) supports the fast three-dimensional mobility of the sodium cations in the inter-chain space.

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Novel olivine and spinel LiMAsO4 (M=3d-metal) as positive electrode materials in lithium cells

Cited by 21 publications

References 9 publications

Delithiation Study of LiFePO[sub 4] Crystals Using Electron Energy-Loss Spectroscopy

Delithiation Study of LiFePO[sub 4] Crystals Using Electron Energy-Loss Spectroscopy

Electrical properties and alkali-pathways simulation of new mixed conductor Na₄Li_0.62Co_5.67Al_0.71(AsO₄)₆

Synthesis, Electrical Properties and Na+ Migration Pathways of Na2CuP1.5As0.5O7

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Novel olivine and spinel LiMAsO4 (M=3d-metal) as positive electrode materials in lithium cells

Cited by 21 publications

References 9 publications

Delithiation Study of LiFePO[sub 4] Crystals Using Electron Energy-Loss Spectroscopy

Delithiation Study of LiFePO[sub 4] Crystals Using Electron Energy-Loss Spectroscopy

Electrical properties and alkali-pathways simulation of new mixed conductor Na4Li0.62Co5.67Al0.71(AsO4)6

Synthesis, Electrical Properties and Na+ Migration Pathways of Na2CuP1.5As0.5O7

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Electrical properties and alkali-pathways simulation of new mixed conductor Na₄Li_0.62Co_5.67Al_0.71(AsO₄)₆