Lithium insertion material of LiNi1/2Mn1/2O2 for advanced lithium-ion batteries

Makimura, Yoshinari; Ohzuku, Tsutomu

doi:10.1016/s0378-7753(03)00170-8

Cited by 272 publications

(225 citation statements)

References 19 publications

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“…Makimura and Ohzuku [29] observed that LiNi 0.5 Mn 0.5 O 2 discharged at slow rates has a rechargeable capacity of about 200 mAh · g -1 in the voltage window of 2.5 -4.5 V vs. Li with 99 % coulombic efficiency over 30 cycles, whereas LiCoO 2 and LiNiO 2 have higher and faster capacity fading when charged to such high voltages [27,28]. According to the investigations of Ohzuku's group [5,29,49] [18] and from Gotcu-Freis et al [21] and LiNi 1/3 ·Mn 1/3 Co 1/3 O 2 from Idemoto and Matsui [24]. The green circle and navy diamond data points from Idemoto and Matsui [24] show the related values for samples synthesized by solution and solid-state methods, respectively.…”

Section: Discussion Of the Enthalpies Of Formationmentioning

confidence: 99%

Enthalpies of formation of layered LiNixMnxCo1–2xO2 (0 ≤ x ≤ 0.5) compounds as lithium ion battery cathode materials

Masoumi

Cupid

Reichmann

et al. 2017

International Journal of Materials Research

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Section: Discussion Of the Enthalpies Of Formationmentioning

confidence: 99%

Enthalpies of formation of layered LiNixMnxCo1–2xO2 (0 ≤ x ≤ 0.5) compounds as lithium ion battery cathode materials

Masoumi

Cupid

Reichmann

et al. 2017

International Journal of Materials Research

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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%

“…All the patterns can be indexed as a rhombohedral structure (JCPDS # 740919) which belongs to the space group 3 R m. It means that pure-phase LiNiO 2 is obtained and no remarkable secondary phase is observed. Moreover, the crystal structural parameters do not change with varying the sintering temperature 6 .…”

Section: X-ray Diffractionmentioning

confidence: 96%

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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“…12 LiNO 3 , Mn(NO 3 ) 3 and Ni(NO 3 ) 3 (99.9%, Wako Pure Chemical Industries, Ltd.) were dissolved into ethanol in an appropriate proportion, and then a precipitate was obtained from the solution by adding oxalic acid. The precursor was calcined in air at 650°C for 24 h, and then fired in air at 950°C for 24 h. A phase of the product was identified preliminarily by an X-ray diffraction measurement (X'Pert Pro, PANalytical), and the metal composition was evaluated with an inductively coupled plasma (ICP) emission spectrometry (ICPE9000, Shimadzu).…”

Section: Methodsmentioning

confidence: 99%

“…It is well known that LiNi 0.5 Mn 0.5 O 2 has the layered rock-salt structure which is assigned typically to the space group of R-3m and shows relatively high discharge capacity. [1][2][3][4][5][6] In the crystal structure, Li and the transition-metal layers stack alternatively along the c axis, and the Li can be deintercalated from the Li layer. Concerning the transition metals (Ni and Mn), they occupy the same crystallographic site and thus their distribution within the layer does not have periodic structure.…”

Section: Introductionmentioning

confidence: 99%

Atomic-Configuration Analysis on LiNi0.5Mn0.5O2 by Reverse Monte Carlo Simulation

2016

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An atomic configuration of LiNi 0.5 Mn 0.5 O 2 with the layered rock-salt structure was investigated by means of the reverse Monte Carlo simulation using neuron Faber-Ziman type structure factor, reduced pair distribution function and Bragg profile simultaneously. From the obtained atomic-configuration snapshot, it is indicated that a bond length of Ni-O is longer than that of Mn-O and is almost the same as that of Li-O. The tendency reflects the different ionic radii of the cations, and should be one of the reasons for a position exchange between Li and Ni in the layered structure, i.e., a cation mixing. It is also demonstrated that a significant correlation of Ni-Ni can be found around 4 Å. Since the correlation corresponds to the second-nearest distance between the Li and transition-metal layers, the analytical result suggests a partial formation of a Ni-O rock-salt domain which can be considered as inactive for Li diffusion. In order to study distributions of Ni and Mn in the transition-metal layer, we analyzed bond-angle distributions of the transition metals. As a result, it is indicated that Ni-Ni-Ni and Mn-Mn-Mn bond angles have the highest probability at 120°, suggesting a local ordering of the transition metals.

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Lithium insertion material of LiNi1/2Mn1/2O2 for advanced lithium-ion batteries

Cited by 272 publications

References 19 publications

Enthalpies of formation of layered LiNixMnxCo1–2xO2 (0 ≤ x ≤ 0.5) compounds as lithium ion battery cathode materials

Enthalpies of formation of layered LiNixMnxCo1–2xO2 (0 ≤ x ≤ 0.5) compounds as lithium ion battery cathode materials

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

Atomic-Configuration Analysis on LiNi<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>2</sub> by Reverse Monte Carlo Simulation

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