A5032384994- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- X-ray Diffraction in Crystallography
- Nuclear Physics and Applications
- Advanced Battery Technologies Research
- Thermal Expansion and Ionic Conductivity
- Advanced Condensed Matter Physics
- Solid-state spectroscopy and crystallography
- Magnetic and transport properties of perovskites and related materials
- Crystallization and Solubility Studies
- Inorganic Fluorides and Related Compounds
- Multiferroics and related materials
- Crystal Structures and Properties
- Chemical Synthesis and Characterization
- Radiation Detection and Scintillator Technologies
- Extraction and Separation Processes
- Hydrogen Storage and Materials
- Ferroelectric and Piezoelectric Materials
- Microstructure and Mechanical Properties of Steels
- Magnetic Properties and Synthesis of Ferrites
- Crystallography and molecular interactions
- Advancements in Solid Oxide Fuel Cells
- Advanced NMR Techniques and Applications
- Superconducting Materials and Applications
- High-pressure geophysics and materials
Yokohama National University
2024
Kagoshima University
2024
High Energy Accelerator Research Organization
2014-2023
Japan Proton Accelerator Research Complex
2011-2023
The Graduate University for Advanced Studies, SOKENDAI
2016-2022
Institute of Materials Structure Science
2006-2020
Ibaraki University
2006-2020
Niigata University
2020
Chubu University
2020
Tohoku University
2020
Abstract Further increase in energy density of lithium batteries is needed for zero emission vehicles. However, restricted by unavoidable theoretical limits positive electrodes used commercial applications. One possibility towards densities exceeding these to utilize anion (oxide ion) redox, instead classical transition metal redox. Nevertheless, origin activation the oxide ion and its stabilization mechanism are not fully understood. Here we demonstrate that suppression formation...
A huge kinetic difference in olivine is demonstrated a quantitative manner. Galvanostatic discharge profiles and the current relaxation to stepwise anodic overvoltage (chronoamperometry) are comparatively measured for under identical extrinsic conditions, which carefully controlled confirmed using Rietveld refinement X-ray diffraction profiles, direct texture observation by scanning electron microscope, Brunauer-Emmett-Teller surface area measurements, tap density measurements. The...
Z-Rietveld is a program suite for Rietveld analysis and the Pawley method; it was developed analyses of powder diffraction data in Materials Life Science Facility Japan Proton Accelerator Research Complex. Improvements have been made to nonlinear least-squares algorithms so that can deal with singular matrices intensity non-negativity constraints. Owing these improvements, successfully executes method without requiring any constraints on integrated intensities, even case severely or exactly...
A variety of proton (H(+))-conducting oxides are known, including those used in electrochemical devices such as fuel cells. In contrast, pure H(-) conduction, not mixed with electron has been demonstrated for oxide-based materials. Considering that hydride ions have an ionic size appropriate fast transport and also a strong reducing ability suitable high-energy storage conversion devices, we prepared series K2NiF4-type oxyhydrides, La(2-x-y)Sr(x + y)LiH(1-x y)O(3-y), the hope observing...
The lithium diffusion pathway in the LGPS structure visualized through MEM analysis assisted elucidating conductivity changes with temperature.
A series of synthetic heterosite−purpurite, (MnyFe1-y)PO4 (y < 0.8), with negligible disorder and impurities, was obtained by chemical oxidation the well-crystallized isotypic tryphillite−lithiophilite series, Li(MnyFe1-y)PO4 (ordered olivine structure, space group Pnma). Comparative magnetic X-ray/neutron powder diffraction investigations two solid−solution lines were performed as a function Mn content to increase understanding electrochemical activity loss Mn3+/Mn2+ in Lix(MnyFe1-y)PO4...
Abstract Among the energy storage devices for applications in electric vehicles and stationary uses, lithium batteries typically deliver high performance. However, there is still a missing link between engineering developments large-scale fundamental science of each battery component. Elucidating reaction mechanisms under practical operation crucial future technology. Here, we report an operando diffraction technique that uses high-intensity neutrons to detect reactions non-equilibrium...
Ni-enriched layered materials are used as electrode of Li-ion batteries for electric vehicle applications. Stoichiometric LiNiO2 with cationic Ni3+/Ni4+ redox is the ideal material, but gradual loss capacity at high voltage region, associated Ni ion migration, hinders its use practical Therefore, to improve reversibility LiNiO2, less abundant Co ions and/or other electrochemically inactive ions, e.g., Al3+ in part substituted ions. Nevertheless, a unified understanding improvement by metal...
Solid solutions of the silicon and tin analogous phases superionic conductor Li<sub>10</sub><italic>M</italic>P<sub>2</sub>S<sub>12</sub> (<italic>M</italic> = Si, Sn) were synthesized by a conventional solid-state reaction in an evacuated silica tube at 823 K. The ranges solid determined to be 0.20 < <italic>δ</italic> 0.43 −0.25 −0.01 Li<sub>10+δ</sub><italic>M</italic><sub>1+δ</sub>P<sub>2−δ</sub>S<sub>12</sub> (0.525 ≤ <italic>k</italic> 0.60 0.67 0.75...
The neutron instruments suite, installed at the spallation source of Materials and Life Science Experimental Facility (MLF) Japan Proton Accelerator Research Complex (J-PARC), is reviewed. MLF has 23 beam ports 21 are in operation for user programs or under commissioning. A unique challenging instrumental suite been realized via combination a high-performance source, optimized scattering, using cutting-edge technologies. All are/will serve world-leading investigations broad range fields,...
A binary system of NaCrO2–TiO2, NaxCrxTi1–xO2 (1.0 ≥ x 0.5), is systematically examined, and the electrodes' performance tested in Na cells. Different layered phases, O3, Na-deficient P2, P3, are found this system, as confirmed by X-ray neutron diffraction techniques. Among them, P2-type Na2/3Cr2/3Ti1/3O2 P3-type Na0.58Cr0.58Ti0.42O2 show excellent electrode positive negative materials, respectively. P2 shows rate capability a electrode, average voltage based on Cr3+/Cr4+ redox cell...
Li2MnO3, an electrode material for Li ion batteries, belongs to the C2/m space group and is known have a cubic-close-packed (ABC...) layered structure, in which transition-metal layer supposed ordered atomic arrangement with atoms at 2b site Mn 4g site. However, recently, it has been reported that this compound usually does not exhibit such ideal structure instead contains large number of structural defects, only stacking faults but also mixing between sites. To elucidate effect defects on...
Solid-state electrolytes that exhibit high ionic conductivities at room temperature are key materials for obtaining the next generation of safer, higher-specific-energy solid-state batteries. However, number currently available crystal structures use as superionic conductors remains limited. Here, we report a lithium conductor, Li2SiS3, with tetragonal symmetry, which possesses new three-dimensional framework structure consisting isolated edge-sharing tetrahedral dimers. This species...
Super High Resolution Powder Diffractometer, SuperHRPD, is located at about 100 m from a thin side of decoupled poisoned moderator the Materials and Life Science Experimental Facility in Japan Proton Accelerator Research Complex. The first neutron was produced successfully spallation source J-PARC end May 2008, SuperHRPD has achieved world best resolution Δ d / = 0.035% June using existing Sirius 1) chamber. In summer 2009, new chamber installed aiming increasing detector solid angle...