On electrochemical impedance measurements of LixCo0.2Ni0.8O2 and LixNiO2 intercalation electrodes

Levi, M. D.; Gamolsky, K.; Aurbach, Doron; Heider, U.; Oesten, R.

doi:10.1016/s0013-4686(99)00402-8

Cited by 217 publications

(198 citation statements)

References 15 publications

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“…LiCoO 2 does, however, suffer from relatively high cost [10] and environmental processing and disposal problems [11]. For this reason, the related materials LiNiO 2 and LiNi 1−x Co x O 2 have been studied as potential substitutes for the lithium ion anode [12], [13], [14], [15], [16], [17] and [18]. LiCoO 2 and "hexagonal" LiNiO 2 can be idealized as cubic (rocksalt) structures in which planes of the much smaller lithium ions alternate with cobalt or nickel ions along the 〈 1 1 1〉 direction ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Surface properties of LiCoO2, LiNiO2 and LiNi1−xCoxO2

Moses

Flores

Kim

et al. 2007

Applied Surface Science

174

126

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Section: Introductionmentioning

confidence: 99%

Surface properties of LiCoO2, LiNiO2 and LiNi1−xCoxO2

Moses

Flores

Kim

et al. 2007

Applied Surface Science

174

126

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“…We have previously reported [29] that this pair of electrodes may serve as an example of a clear correlation between their crystallographic structure and the electrochemical behaviour. In fact, considering the whole range of intercalation potentials from 3.2 to 4.1-4.2 V (vs. Li/Li + ), in which X decreases from unity to ca.…”

Section: Comparison Between Experimental and Theoretically Simulated mentioning

confidence: 84%

“…All other 6 electrodes were composites consisting of the related powdery mass mixed with polyvinylidene fluoride (PVdF) binder and electrically conductive carbon black (only in the case of the cathodes). Details can be found in previous publications related to graphite [10,11], disordered carbons [12], LiCoO 2 [13], LiNiO 2 and LiNi 0.8 Co 0.2 O 2 [14,15]. In brief, graphite electrodes were composed of 90% of synthetic graphite powder KS 6 (Lonza, 6 µm average particle size along the basal plane, 0.1-0.5 µm thick) and 10% PVdF binder.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, this potential drop will not change with applied potential (the changes in electron concentration with potential are much smaller than the bulk electron concentration itself). This system is characterized by a single potential drop across the host/solution interface due to the dependence of the chemical potential of Li-ions on X, equation (29). In this case a simple Frumkin-type isotherm (equation (28)) rigorously describes the E vs. X relationship; the related differential intercalation capacity is expressed as a function of X by equation (33).…”

Section: Relation Of the Classical "Enhancement Factor" W I To Particmentioning

confidence: 99%

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INTERPRETATION OF POTENTIAL INTERMITTENCE TITRATION TECHNIQUE EXPERIMENTS FOR VARIOUS Li-INTERCALATION ELECTRODES

Lévi¹,

Aurbach²,

Vorotyntsev³

2002

Condens. Matter Phys.

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In this paper we compare two different approaches for the calculation of the enhancement factor W i , based on its definition as the ratio of the chemical and the component diffusion coefficients for species in mixed-conduction electrodes, originated from the "dilute solution" or "lattice gas" models for the ion system. The former approach is only applicable for small changes of the ion concentration while the latter allows one to consider a broad range of intercalation levels. The component diffusion coefficient of lithium ions has been determined for a series of lithium intercalation anodes and cathodes. A new "enhancement factor" for the ion transport has been defined and its relations to the intercalation capacitance and the intercalation isotherm have been established. A correlation between the dependences of the differential capacitance and the partial ion conductivity on the potential has been observed. It is considered as a prove that the intercalation process is controlled by the availability of sites for Li-ion insertion rather than by the concurrent insertion of the counter-balancing electronic species.

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“…According to the factor group analysis, the infrared spectra of LiNiO 2 compounds with 3 R m space group yield four infrared active modes. In the Figure 8, we observe the mode of vibrations for LiNiO 2 in the 400-1000 cm -1 region, which is largely associated with the vibrations of NiO 6 11 .…”

Section: Fourier Transform Infrared Spectramentioning

confidence: 85%

Preparation and Structural Stability of LiNiO2 in Separate Synthesis Methods at Different Temperatures

2014

Chem Sci Trans

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Abstract:The LiNiO 2 has been the most widely used cathode material in commercial lithium ion batteries because of its high discharge capacity, low cost and environmentally acceptable properties. However, it is difficult to obtain stoichiometric LiNiO 2 by solid-state reaction method at high temperature in air atmosphere. This is due to the instability of trivalent nickel species and disordering of cationic distribution at lithium sites. In this paper, we have synthesized the LiNiO 2 cathode material by sol-gel and solid state reaction methods at different temperatures (between 750 ºC and 800 ºC) for obtaining the sample in good phase formation. The sol-gel synthesis method is mainly used because the chemical reaction is easy and also it requires only a low reaction temperature. Further it yields a high degree of homogeneity compared to the conventional solid state synthesis. The crystal structure, bonding nature and vibrational features of the compound are investigated. The crystalline powders are characterized for their phase identification using x-ray diffraction analysis (XRD). All the samples synthesized by these two methods possessed the α-NaFeO 2 structure of the rhombohedral system (space group, 3 R m ) with no evidence of any impurities. The morphological features of the powders are characterized by field effect scanning electron microscopy (FESEM). The grain sizes of the samples are found to be approximately 1.5-2 μm. The FT-IR spectroscopic data of LiNiO 2 reveal the structure of the oxide lattice constituted by LiO 6 and NiO 6 octahedra. From this study we conclude that the LiNiO 2 synthesized by sol-gel method is structurally stable and it can be used as cathode in lithium ion batteries.

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On electrochemical impedance measurements of LixCo0.2Ni0.8O2 and LixNiO2 intercalation electrodes

Cited by 217 publications

References 15 publications

Surface properties of LiCoO2, LiNiO2 and LiNi1−xCoxO2

Surface properties of LiCoO2, LiNiO2 and LiNi1−xCoxO2

INTERPRETATION OF POTENTIAL INTERMITTENCE TITRATION TECHNIQUE EXPERIMENTS FOR VARIOUS Li-INTERCALATION ELECTRODES

Preparation and Structural Stability of LiNiO2 in Separate Synthesis Methods at Different Temperatures

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