Préparation et étude de LiCuO

Migeon, H.-N.; Zanne, Michel; Gleitzer, C.; Courtois, A.

doi:10.1016/0022-4596(76)90048-7

Cited by 33 publications

(11 citation statements)

References 5 publications

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“…This trend has already been observed forLiNi2_O2 5,8,9,24,25,27 and obviously overcompensates the adverse effect of the monovalent, larger Li' ion which enters the transition metal layers when the lattice becomes monoclinic. The indexes m and h signify monoclinic and hexagonal, respectively.…”

mentioning

confidence: 54%

“…13), which could react to form Li2CO3 and/or LiOH during the XRD measurement in air. The values for the four variables m, n, x, and y were obtained after solving the following system of equations b/c = y/(1y) [8] a=mx+2n [9] b + c = m(y + 1y)(2 -x) = m(2 -x) d=2rn+n [11] Because the as-deposited films had as many cations as oxygen anions, namely, Li1 28Mn036Ni03002 and Li1 28Mn834Ni04602, and annealing in N2 produced an overall film stoichiometry of LiaMnbNi,Od where a + b + c> d, we conclude that the Li20 coprecipitation had to be accompanied by corresponding 02 evolution To minimize this problem, we limited the air exposure time to less than 30 s when loading the samples into the RBS equipment.…”

Section: Iii) the Close Structural Relationship Between Linio3 Andmentioning

confidence: 99%

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Lithium Manganese Nickel Oxides Li x ( Mn y Ni1 − y ) 2 − x O 2 : I. Synthesis and Characterization of Thin Films and Bulk Phases

Neudecker

Zuhr

Kwak

et al. 1998

J. Electrochem. Soc.

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The series Li(Mn Ni1_ )2_O2 for x s 1.33 and 0.38 y 0.50 shows a very close relationship to its parent series LiNi202. The refineà lattice parameters for at least 0.93 x 1.26 are a linear function of the concentration ratio Li/(Mn + Ni) which in turn is proportional to the averaged valence state of the transition metals. Li(Mn9Ni1_9)202 is able to reversibly coprecipitate/reinsert Li20 and release/absorb 02. This self-regulation mechanism seems to always adjust the number of cations to an undisturbed oxygen sublattice according to the rule "cations/anions = 1," which holds true at least for temperatures up to 800°C and oxygen partial pressures above i0 atm. Samples prepared in air and under 02 did not show nucleation of Li20, not even for x> 1.0. The series Li(Mn6Ni1_6)202 where 0.38 y 0.50 crystallizes in a rhombohedral unit cell (space group R3m) for x < 1.15 and transforms into a single monoclinic phase (space group C2/c) for x> 1.25. The similarity between LiNi2_02 and Li,(Mn0Ni1_9)202 strongly suggests a rhombohedralcubic transition at x 0.6 for the latter series. Derived from the linear dependence of the X-ray density on the stoichiometric parameter x, an equation was found with which the lithium concentration of Li(Mn9Ni,_0)202 thin film phases over the entire range 0 x 1.33 can be determined accurately without extensive ion-beam analysis. XPS measurements on a film with the bulk stoichiometry Li110Mn039Ni05102 gave evidence for Mn4 and Mn3, but no indication was found for nickel valence states other than Ni2. In order to meet the above-given stoichiometry, the averaged nickel valence state had to increase with film depth. lnfroduction In recent years, LiNiO2 has been used as a cathode material in high-voltage lithium-ion and lithium batteries.1-4 Electrochemical experiments, however, showed that a slight deviation from the ideal starting stoichiometry LiNiO2 resulted in a poor cell performance caused by Ni2 defects on Li sites.5 Moreover, upon extensive lithium deintercalation wherein x in LiNi02 approaches zero and the nickel valence state comes close to its maximum of +4, nickel ions migrate from their nickel layer sites into the vacancies of the lithium layers. Such nickel migration creates severe diffusional limitations to lithium reinsertion thereby reducing cell performance. 6 These drawbacks stimulated our research on the partially substituted manganese derivatives of LiNiO2, namely, Li(Mn.4Ni1_9)202. In particular, it was felt that the introduction of Mn" "buffer ions," which easily form under typical solid-state preparation conditions such as annealing at 700°C in air; would lift the electrochemically detrimental effect Ni2-defects impose on chemically prepared LiNiO2 cathodes. That is, Mn" ions could help balance the two oxygen anions without the need of Ni2 occupying Li sites. * Electrochemical Society Active Member. The purpose of this paper is to describe the synthesis and characterization of Li(Mn0Ni10)202 in thin-film and bulk forms. Our electrochemical studies of the thin films are reporte...

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mentioning

confidence: 54%

Section: Iii) the Close Structural Relationship Between Linio3 Andmentioning

confidence: 99%

Lithium Manganese Nickel Oxides Li x ( Mn y Ni1 − y ) 2 − x O 2 : I. Synthesis and Characterization of Thin Films and Bulk Phases

Neudecker

Zuhr

Kwak

et al. 1998

J. Electrochem. Soc.

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“…However, when the oxygen partial pressure is increased, it is possible to stabilize samples in the region −1/3≤ z <0, where the new end member is Li 2 NiO 3 (Ni 4+ ). To synthesize it, either a p (O 2 ) up to 15 MPa or high‐pressure synthesis up to 3–4 GPa (at ϑ ≈700 °C) were employed . In this compound, which still displays a layered structure, z lithium ions are in the nickel layer.…”

Section: Phase Diagram: the Li2o‐nio‐o2 Regionmentioning

confidence: 99%

There and Back Again—The Journey of LiNiO₂ as a Cathode Active Material

et al. 2019

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This Review provides a comprehensive overview of LiNiO2 (LNO), almost 30 years after its introduction as a cathode active material. We aim to highlight the physicochemical peculiarities that make LNO a complex material in every aspect. We specifically stress the effect of the Li off‐stoichiometry (Li1−zNi1+zO2) on every property of LNO, especially the electrochemical ones. The key instability issues that plague the compound and the strategies that have been implemented so far to overcome them are discussed in detail. Finally, the open questions that remain to be addressed by the scientific community are summarized, and the research directions that seem the most promising to enable LNO to be fully exploited are elucidated.

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“…A series of lithium copper oxide compounds, Li 2 CuO 2 , Li 3 CuO 3 , Li 3 Cu 2 O 4 , LiCu 2 O 2 , LiCu 3 O 3 and so on, have been reported in the literature [9][10][11][12]. Of them, Li 2 CuO 2 is constructed from one-dimensional chains of edgesharing CuO 4 square planar units [13,14] and shows a relatively large amount of lithium per unit formula.…”

Section: Introductionmentioning

confidence: 99%

Preparation and electrochemical properties of a Li2CuO2–Li2NiO2 solid solution as a lithium-intercalation electrode

Imanishi¹,

Shizuka²,

Ikenishi³

et al. 2006

Solid State Ionics

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Préparation et étude de LiCuO

Cited by 33 publications

References 5 publications

Lithium Manganese Nickel Oxides Li x ( Mn y Ni1 − y ) 2 − x O 2 : I. Synthesis and Characterization of Thin Films and Bulk Phases

Lithium Manganese Nickel Oxides Li x ( Mn y Ni1 − y ) 2 − x O 2 : I. Synthesis and Characterization of Thin Films and Bulk Phases

There and Back Again—The Journey of LiNiO₂ as a Cathode Active Material

Preparation and electrochemical properties of a Li2CuO2–Li2NiO2 solid solution as a lithium-intercalation electrode

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Préparation et étude de LiCuO

Cited by 33 publications

References 5 publications

Lithium Manganese Nickel Oxides Li x ( Mn y Ni1 − y ) 2 − x O 2 : I. Synthesis and Characterization of Thin Films and Bulk Phases

Lithium Manganese Nickel Oxides Li x ( Mn y Ni1 − y ) 2 − x O 2 : I. Synthesis and Characterization of Thin Films and Bulk Phases

There and Back Again—The Journey of LiNiO2 as a Cathode Active Material

Preparation and electrochemical properties of a Li2CuO2–Li2NiO2 solid solution as a lithium-intercalation electrode

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There and Back Again—The Journey of LiNiO₂ as a Cathode Active Material