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en: Oxygen desorption properties of perovskite-type SrFe1xCoxO3δ: B-site mixing effect on the reduction properties of Fe and Co ions

en: Journal of Solid State Chemistry

ja: Journal of Solid State Chemistry


en: Effects of Crystal Host Structure on Oxygen Desorption Behavior in Perovskite-type AeFe0.9In0.1O3-δ (Ae = Sr, Ba)

en: The Journal of Physical Chemistry C

ja: The Journal of Physical Chemistry C


en: Evaluation of the Electronic and Local Structure of Mn in Proton-Conducting Oxide, Ca(Zr,Mn)O3-δ, to Elucidate a Direct Hydrogen-Dissolution Reaction


en: Defect chemical studies on oxygen release from the Li-rich cathode material Li1.2Mn0.6Ni0.2O2δ

en: Journal of Materials Chemistry. A, Materials for Energy and Sustainability


en: Strain-Induced Stabilization of Charged State in Li-Rich Layered Transition-Metal Oxide for Lithium-Ion Batteries


en: High temperature degradation mechanism of a red phosphor, CaAlSiN3:Eu for solid-state lighting

en: Journal of Applied Physics

ja: Journal of Applied Physics


en: Direct observation of layered-to-spinel phase transformation in Li2MnO3 and the spinel structure stabilised after the activation process

ja: Journal of Materials Chemistry. A, Materials for Energy and Sustainability


en: Quantitative Analysis of Transition-Metal Migration Induced Electrochemically in Lithium-Rich Layered Oxide Cathode and Its Contribution to Properties at High and Low Temperatures


en: Direct observation of reversible oxygen anion redox reaction in Li-rich manganese oxide, Li2MnO3, studied by soft X-ray absorption spectroscopy


en: Charge compensation analysis of Li-rich layered oxide positive electrode using X-ray absorption fine structure measurement in the soft X-ray region

ja: 軟X 線XAFS によるリチウム過剰層状酸化物正極の電荷補償機構解析

en: Advances in X-Ray Chemical Analysis, Japan

ja: X線分析の進歩


en: Roles of transition metals interchanging with lithium in electrode materials

en: Roles of antisite transition metals interchanging with Li atoms in electrode materials of Li transition-metal complex oxides were clarified using a newly developed direct labeling method, termed powder diffraction anomalous fine structure (P-DAFS) near the Ni K-edge. We site-selectively investigated the valence states and local structures of Ni in Li0.89Ni1.11O2, where Ni atoms occupy mainly the NiO2 host-layer sites and partially the interlayer Li sites in-between the host layers, during electrochemical Li insertion/extraction in a lithium-ion battery (LIB). The site-selective X-ray near edge structure evaluated via the P-DAFS method revealed that the interlayer Ni atoms exhibited much lower electrochemical activity as compared to those at the host-layer site. Furthermore, the present analyses of site-selective extended X-ray absorption fine structure performed using the P-DAFS method indicates local structural changes around the residual Ni atoms at the interlayer space during the initial charge; it tends to gather to form rock-salt NiO-like domains around the interlayer Ni. The presence of the NiO-like domains in the interlayer space locally diminishes the interlayer distance and would yield strain energy because of the lattice mismatch, which retards the subsequent Li insertion both thermodynamically and kinetically. Such restrictions on the Li insertion inevitably make the NiO-like domains electrochemically inactive, resulting in an appreciable irreversible capacity after the initial charge but an achievement of robust linkage of neighboring NiO2 layers that tend to be dissociated without the Li occupation. The P-DAFS characterization of antisite transition metals interchanging with Li atoms complements the understanding of the detailed charge-compensation and degradation mechanisms in the electrode materials.

en: Physical Chemistry Chemical Physics

ja: Physical Chemistry Chemical Physics


en: Structural modification by adding Li cations into Mg/Cs-TFSA molten salt facilitating Mg electrodeposition

en: RSC Advances

ja: RSC Advances


en: Direct observation of reversible charge compensation by oxygen ion in Li-rich manganese layered oxide positive electrode material, Li1.16Ni0.15Co0.19Mn0.50O2

en: Journal of Power Sources

ja: Journal of Power Sources


en: Three-dimensional nano electrode by metal nanowire nonwoven clothes

en: Metal nanowire nonwoven cloth (MNNC) is a metal sheet that has resulted from intertwined metal nanowires 100 nm in diameter with several dozen micrometers of length. Thus, it is a new metallic material having both a flexibility of the metal sheet and a large specific surface area of the nanowires. As an application that utilizes these properties, we propose a high-cyclability electrode for Li storage batteries, in which an active material is deposited or coated on MNNC. The proposed electrode can work without any binders, conductive additives, and current collectors, which might largely improve a practical gravimetric energy density. Huge electrode surfaces provide efficient ion/electron transports, and sufficient interspaces between the respective nanowires accommodate large volume expansions of the active material. To demonstrate these advantages, we have fabricated a NiO-covered nickel nanowire nonwoven cloth (NNNC) by electroless deposition under a magnetic field and annealing in air. The adequately annealed NNNC was shown to be an excellent conversion-type electrode that exhibits a quite high cyclability, 500 mAh/g at 1 C after 300 cycles, compared to that of a composite electrode consisting of NiO nanoparticles. Thus, the present design concept will contribute to a game-changing technology in future lithium ion battery (LIB) electrodes.

en: Nano Letters

ja: Nano Letters


en: Electrochemical behavior of magnesium alloys in alkali metal-TFSA ionic liquid for magnesium-battery negative electrode

en: Journal of the Electrochemical Society

ja: Journal of the Electrochemical Society


en: A new aspect of chevrel compounds as positive electrodes for magnesium batteries

en: Journal of Materials Chemistry. A, Materials for Energy and Sustainability


en: In situ two-dimensional micro-imaging XAFS with CCD detector

en: Journal of Physics: Conference Series

ja: Journal of Physics: Conference Series


en: Charge compensation mechanisms in Li1.16Ni0.15Co0.19Mn0.50O2 positive electrode material for Li-ion batteries analyzed by a combination of hard and soft X-ray absorption near edge structure


en: Elastically constrained phase-separation dynamics competing with charge process in LiFePO4/FePO4 system


en: An X-ray Absorption Spectroscopic Study on Mixed Conductive La0.6Sr0.4Co0.8Fe0.2O3- Cathodes I. Electrical Conductivity and Electronic Structure

en: The electrical conduction mechanism of mixed conductive perovskite oxides, La(0.6)Sr(0.4)Co(0.8)Fe(0.2)O(3-δ), for cathode materials of solid oxide fuel cells has been investigated from electronic structural changes during oxygen vacancy formation. La(0.6)Sr(0.4)Co(0.8)Fe(0.2)O(3-δ) was annealed under various oxygen partial pressures p(O(2))s at 1073 K and quenched. Iodometric titration indicated that the oxygen nonstoichiometry of La(0.6)Sr(0.4)Co(0.8)Fe(0.2)O(3-δ) depended on the annealing p(O(2)), with more oxygen vacancies introduced at lower than at higher p(O(2))s. X-Ray absorption spectroscopic measurements were performed at the O K-, Co L-, Fe L-, Co K-, and Fe K-edges. The valence states of the Co and Fe ions were investigated by the X-ray absorption near edge structure (XANES) at the Co and Fe L(III)-edges. While the Fe average valence was almost constant, the valence of the Co ions decreased with oxygen vacancy introduction. The O K-edge XANES spectra indicated that electrons were injected into the Co 3d/O 2p hybridization state with oxygen vacancy introduction. Both absorption edges at the Co and Fe K-edge XANES shifted towards lower energies with oxygen vacancy introduction. The shift at the Co K-edge resulted from the decrease in the Co average valence and that at the Fe K-edge appeared to be caused by changes in the coordination environment around the Fe ions. The total conductivity of La(0.6)Sr(0.4)Co(0.8)Fe(0.2)O(3-δ) decreased with decreasing p(O(2)), due to a decreasing hole concentration.


en: In situ two-dimensional imaging quick-scanning XAFS with pixel array detector

en: Quick-scanning X-ray absorption fine structure (XAFS) measurements were performed in transmission mode using a PILATUS 100K pixel array detector (PAD). The method can display a two-dimensional image for a large area of the order of a centimetre with a spatial resolution of 0.2 mm at each energy point in the XAFS spectrum. The time resolution of the quick-scanning method ranged from 10 s to 1 min per spectrum depending on the energy range. The PAD has a wide dynamic range and low noise, so the obtained spectra have a good signal-to-noise ratio.

en: Journal of Synchrotron Radiation

ja: Journal of Synchrotron Radiation


en: Electrical conductivity and chemical diffusion in Perovskite-type proton conductors in H2H2O gas mixtures

en: Solid State Ionics

ja: Solid State Ionics


en: Nanoscale Observation of the Electronic and Local Structures of LiCoO2 Thin Film Electrode by Depth-Resolved X-ray Absorption Spectroscopy

en: The Journal of Physical Chemistry Letters


en: X-ray Absorption Spectroscopic Study on La0.6Sr0.4CoO3-δ Cathode Materials Related with Oxygen Vacancy Formation

en: The Journal of Physical Chemistry C


en: Local structural analysis for oxide ion transport in La0.6Sr0.4FeO3-δ Cathodes

en: Journal of Materials Chemistry

ja: Journal of Materials Chemistry


en: Thickness estimation of interface films formed on Li1-xCoO2 electrodes by hard X-ray photoelectron spectroscopy

en: Journal of Power Sources


en: Defect structure analysis of proton-oxide ion mixed conductor BaCe0.9Nd0.1O3 - δ


en: Reaction kinetics on platinum electrode / yttrium-doped barium cerate interface under H2H2O atmosphere


en: Defect structure analysis of B-site doped perovskite-type proton conducting oxide BaCeO3 Part 1: The defect concentration of BaCe0.9M0.1O3-δ (M = Y and Yb)


en: Defect structure analysis of B-site doped perovskite-type proton conducting oxide BaCeO3: Part 2: The electrical conductivity and diffusion coefficient of BaCe0.9Y0.1O3-δ


en: Oxygen nonstoichiometry of the perovskite-type oxides BaCe0.9M0.1O3 - δ (M Y, Yb, Sm, Tb, and Nd)


en: Oxygen nonstoichiometry and defect structure analysis of B-site mixed perovskite-type oxide (La, Sr)(Cr, M)O3 (M=Ti, Mn and Fe)

en: Journal of Solid State Chemistry


en: Oxygen nonstoichiometry of B-site doped LaCrO3


en: Fuel Cell System for Two-Wheeled Vehicles

en: SAE International Journal of Engines

ja: SAE International Journal of Engines


en: Development of powder diŠraction anomalous fine structure method and applications to electrode materials for rechargeable batteries

ja: P-DAFS 法の開発と蓄電池正極材料への応用

en: Journal of japanese society for synchroton radiation research

ja: 放射光