Dependence of property, cathode characteristics, thermodynamic stability, and average and local structures on heat-treatment condition for LiNi0.5Mn0.5O2 as a cathode active material for Li-ion battery

Kitamura, Naoto; Hasegawa, Tetsuya; Uchimoto, Yoshiharu; Amezawa, Koji; Idemoto, Yasushi

doi:10.1016/j.electacta.2011.08.034

Cited by 10 publications

(8 citation statements)

References 21 publications

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“…Site A can be substituted by monovalent transition‐metal ions, such as Ag + and Cu + , while B site can be substituted by di and tetravalent ions in 0.5:0.5 mole ratio . The latter type of Li‐based LiBB'O 2 (B = Co 2+ , Ni 2+ , Fe 2+ , Cu 2+ ; B' = Mn 4+ , Ti 4+ , Sn 4+ ) have attracted considerable attention as high‐capacity cathode materials in rechargeable lithium batteries due to their high energy density, fairly long cycle life, and wide range of operating temperatures . In addition, most of these oxides have large band gaps in UV region of the electromagnetic spectrum, which hinders their use in many photocatalytic‐ and photovoltaic‐type applications.…”

Section: Introductionmentioning

confidence: 99%

Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu²⁺, Sn²⁺, and Ag⁺‐Substituted LiMg_0.5Ti_0.5O₂

et al. 2014

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A novel series of visible light‐sensitive Cu2+, Sn2+, and Ag+‐substituted LiMg0.5Ti0.5O2 photocatalysts were synthesized by a facile ion‐exchange method and characterized by XRD, UV‐Vis diffuse reflectance spectra, scanning electron microscopy equipped with an X‐ray energy‐dispersive spectroscopy, Brunauer‐Emmett‐Teller surface area, inductively coupled plasma mass spectrometry, and thermal gravimetric analysis. The characterization results showed that morphology, crystallite size, and surface areas of the ion‐exchange products were almost similar to the parent compound. Absorption edges of Ag+‐doped (AMT), Cu2+‐doped (CMT), and Sn2+‐doped (SMT) samples were red shifted remarkably into the visible light region while parent LiMg0.5Ti0.5O2 (LMT) was UV active. Photocatalytic activity of these samples was evaluated by studying the degradation of methylene blue and nitro benzene under visible light irradiation and the stability of all samples during photocatalytic experiment was also investigated. The activity of all photocatalysts was ranked accordingly as SMT ≥ AMT > CMT > LMT. The correlation between photocatalytic properties, band gap energy, rate of recombination of the charge carriers, and amount of ●OH radicals generated during photocatalysis and the underlying reasons were discussed.

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Section: Introductionmentioning

confidence: 99%

Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu²⁺, Sn²⁺, and Ag⁺‐Substituted LiMg_0.5Ti_0.5O₂

et al. 2014

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“…From such background, we have investigated Li x Mn 2 − y M y O 4 (M = Cr, Al, Mg, Co, Ni, and Zn) with the spinel structure, orthorhombic-type Li x Mn 1 − y M y O 2 (M = Mn, Al, Cu, Co, and Ni), Li x Mn 1/3 Co 1/3 − y Ni 1/3 M y O 2 (M = Al, Ti and Fe) and Li x Ni 0.5 Mn 0.5 O 2 with the layered structure, and reported relationships among the cathode properties, structural stabilities and thermodynamic stabilities [1][2][3][4][5][6][7]. As is well known, Li(Ni, Co)O 2 -based materials with the layered rock-salt structure, for example Li(Ni, Co, Al)O 2 , are also promising candidates as a cathode of the lithium-ion battery due to the higher capacity and the higher stability than a traditional cathode LiCoO 2 [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 96%

Crystal and electronic structures, thermodynamic stability, and cathode performance of Li(Ni, Co, M)O2 (M = Cu, Zn)

2015

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“…Amounts of cation mixings (Ni at 3a site and Li at 3b site), bond valence sums(B.V.S.) at 3b sites, and quadratic elongations, λ, and bond angle variances, σ 2 , of 3b-O6 octahedra in Li(Mn 1/3 Ni 1/3 Co 1/3 )O 2 and Li(Mn 1/3 Ni 1/3 Co 2/9 Al 1/9 )O 2 .These values were calculated from the average structure refined by the Rietveld method using neutron diffraction data.…”

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confidence: 99%

Average and Local Structure Analyses of Li(Mn_1/3Ni_1/3Co_1/3−xAl_x)O₂Using Neutron and Synchrotron X-ray Sources

Idemoto¹,

Kitamura²,

Ueki

et al. 2012

J. Electrochem. Soc.

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We prepared Li(Mn 1/3 Ni 1/3 Co 1/3-x Al x )O 2 by a solution method, and then investigated the electrode characteristics and average and local structures. From the charge-discharge cycle tests, it was found that Li(Mn 1/3 Ni 1/3 Co 2/9 Al 1/9 )O 2 exhibited a worse cycle performance than Li(Mn 1/3 Ni 1/3 Co 1/3 )O 2 . In order to clarify the reason for this decrease from the viewpoint of the crystal structure, the average structures of the samples were studied by the Rietveld and Maximum Entropy Method (MEM) techniques using the neutron and synchrotron X-ray diffraction patterns. As a result, it was found that the Al substitution did not have a significant effect on the average structure. In order to reveal the local structures, we also performed X-ray absorption fine structure (XAFS) and Pair Distribution Function (PDF) analysis using neutron scattering data. These analyses implied that the stacking of the transition-metal layers varied by the partial substitution of Al for Co, and the arrangement had an influence on the cathode properties.

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Dependence of property, cathode characteristics, thermodynamic stability, and average and local structures on heat-treatment condition for LiNi0.5Mn0.5O2 as a cathode active material for Li-ion battery

Cited by 10 publications

References 21 publications

Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu²⁺, Sn²⁺, and Ag⁺‐Substituted LiMg_0.5Ti_0.5O₂

Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu²⁺, Sn²⁺, and Ag⁺‐Substituted LiMg_0.5Ti_0.5O₂

Crystal and electronic structures, thermodynamic stability, and cathode performance of Li(Ni, Co, M)O2 (M = Cu, Zn)

Average and Local Structure Analyses of Li(Mn_1/3Ni_1/3Co_1/3−xAl_x)O₂Using Neutron and Synchrotron X-ray Sources

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Dependence of property, cathode characteristics, thermodynamic stability, and average and local structures on heat-treatment condition for LiNi0.5Mn0.5O2 as a cathode active material for Li-ion battery

Cited by 10 publications

References 21 publications

Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu2+, Sn2+, and Ag+‐Substituted LiMg0.5Ti0.5O2

Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu2+, Sn2+, and Ag+‐Substituted LiMg0.5Ti0.5O2

Crystal and electronic structures, thermodynamic stability, and cathode performance of Li(Ni, Co, M)O2 (M = Cu, Zn)

Average and Local Structure Analyses of Li(Mn1/3Ni1/3Co1/3−xAlx)O2Using Neutron and Synchrotron X-ray Sources

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Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu²⁺, Sn²⁺, and Ag⁺‐Substituted LiMg_0.5Ti_0.5O₂

Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu²⁺, Sn²⁺, and Ag⁺‐Substituted LiMg_0.5Ti_0.5O₂

Average and Local Structure Analyses of Li(Mn_1/3Ni_1/3Co_1/3−xAl_x)O₂Using Neutron and Synchrotron X-ray Sources