Yoshiharu Uchimoto
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View article: Unraveling Asymmetric Macroscopic Reaction Dynamics in Solid‐State Li–S Batteries During Charge–Discharge Cycles: Visualizing Ionic Transport Limitations with <i>Operando</i> X‐Ray Computed Tomography
Unraveling Asymmetric Macroscopic Reaction Dynamics in Solid‐State Li–S Batteries During Charge–Discharge Cycles: Visualizing Ionic Transport Limitations with <i>Operando</i> X‐Ray Computed Tomography Open
By eliminating liquid electrolytes, solid‐state Li–S batteries (SSLSBs) deliver emerging high‐energy storage solutions with intrinsic safety advantages. However, restricted access to in‐battery reaction dynamics has obscured the mechanisms…
View article: Ultra‐High‐Capacity of Earth‐Abundant Cathodes Enabled by Excess Fluoride‐Ion Insertion/Extraction (Adv. Energy Mater. 29/2025)
Ultra‐High‐Capacity of Earth‐Abundant Cathodes Enabled by Excess Fluoride‐Ion Insertion/Extraction (Adv. Energy Mater. 29/2025) Open
View article: Ultra‐High‐Capacity of Earth‐Abundant Cathodes Enabled by Excess Fluoride‐Ion Insertion/Extraction
Ultra‐High‐Capacity of Earth‐Abundant Cathodes Enabled by Excess Fluoride‐Ion Insertion/Extraction Open
All‐solid‐state fluoride‐ion batteries (FIBs) are highly prospective candidates for next‐generation batteries due to their superior energy density and safety to lithium‐ion batteries (LIBs). Nevertheless, the full potential of FIBs remains…
View article: FC-BENTEN: Synchrotron X-Ray Experimental Database for Polymer-Electrolyte Fuel-Cell Material Analysis
FC-BENTEN: Synchrotron X-Ray Experimental Database for Polymer-Electrolyte Fuel-Cell Material Analysis Open
This review is focused on FC-BENTEN, an advanced synchrotron X-ray experimental database developed at SPring-8 with support from Japan’s New Energy and Industrial Technology Development Organization (NEDO). Designed to advance polymer elec…
View article: Measurement Methods on Electrodes and Electrocatalysts for Water Electrolysis
Measurement Methods on Electrodes and Electrocatalysts for Water Electrolysis Open
Toward decarbonized society with sustainable growth, the use of renewable energy as a primary power source is highly demanded. Water electrolysis is promising to produce hydrogen from renewable energy for energy storage and transportation.…
View article: Structural Control of PtNi Catalysts through Precise Synthesis Conditions and Elucidation of Property Determinants by <i>Operando</i> XAS Analysis
Structural Control of PtNi Catalysts through Precise Synthesis Conditions and Elucidation of Property Determinants by <i>Operando</i> XAS Analysis Open
PtNi alloy catalysts exhibit shape-dependent oxygen reduction reaction (ORR) activity and durability, influenced by synthesis conditions. In this study, a standardized synthesis method was developed by controlling the heating rate during n…
View article: Structural Dynamics of Amorphous Phase in Sriro3 Catalyst During Oxygen Evolution Reaction Revealed by Operando Total X-Ray Scattering Measurements and Pair Distribution Function Analysis
Structural Dynamics of Amorphous Phase in Sriro3 Catalyst During Oxygen Evolution Reaction Revealed by Operando Total X-Ray Scattering Measurements and Pair Distribution Function Analysis Open
View article: Elucidation of the factors governing the oxygen evolution reaction in Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub><i>x</i></sub>Fe<sub>1−<i>x</i></sub>O<sub>3−<i>δ</i></sub> catalysts <i>via operando</i> hard and soft X-ray absorption spectroscopy
Elucidation of the factors governing the oxygen evolution reaction in Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub><i>x</i></sub>Fe<sub>1−<i>x</i></sub>O<sub>3−<i>δ</i></sub> catalysts <i>via operando</i> hard and soft X-ray absorption spectroscopy Open
An integrated operando bulk and surface-sensitive X-ray absorption spectroscopy was employed to elucidate the intrinsic roles of Co and Fe at the active sites during the oxygen evolution reaction in Ba 0.5 Sr 0.5 Co x Fe 1− x O 3− δ cataly…
View article: Structural Dynamics of Amorphous Phase in Sriro3 Catalyst During Oxygen Evolution Reaction Revealed by Operando Total X-Ray Scattering Measurements and Pair Distribution Function Analysis
Structural Dynamics of Amorphous Phase in Sriro3 Catalyst During Oxygen Evolution Reaction Revealed by Operando Total X-Ray Scattering Measurements and Pair Distribution Function Analysis Open
View article: Phase-Transition-Induced Crack Formation in LiNi<sub>0.8</sub>Mn<sub>0.1</sub>Co<sub>0.1</sub>O<sub>2</sub> Cathode Materials: A Comparative Study of Single-Crystalline and Polycrystalline Morphologies Using <i>Operando</i> X-ray CT
Phase-Transition-Induced Crack Formation in LiNi<sub>0.8</sub>Mn<sub>0.1</sub>Co<sub>0.1</sub>O<sub>2</sub> Cathode Materials: A Comparative Study of Single-Crystalline and Polycrystalline Morphologies Using <i>Operando</i> X-ray CT Open
View article: Structure and particle surface analysis of Li2S–P2S5–LiI-type solid electrolytes synthesized by liquid-phase shaking
Structure and particle surface analysis of Li2S–P2S5–LiI-type solid electrolytes synthesized by liquid-phase shaking Open
Li 2 S–P 2 S 5 –LiI-type solid electrolytes, such as Li 4 PS 4 I, Li 7 P 2 S 8 I, and Li 10 P 3 S 12 I, are promising candidates for anode layers in all-solid-state batteries because of their high ionic conductivity and stability toward Li…
View article: Elevating Operation Voltage and Suppressing Phase Transition for Honeycomb‐Layered Cathodes by a Dual‐Honeycomb Structure Strategy
Elevating Operation Voltage and Suppressing Phase Transition for Honeycomb‐Layered Cathodes by a Dual‐Honeycomb Structure Strategy Open
Honeycomb‐layered oxides are a class of cathode materials for sodium‐ion batteries with great potential due to their high voltage and high capacity. However, the structural instability and voltage fading during cycling limit their practica…
View article: Influence of Primary Particle Morphology and Hydrophilicity of Carbon Matrix on Electrode Coating Quality and Performance of Practical High‐Energy‐Density Li–S Batteries
Influence of Primary Particle Morphology and Hydrophilicity of Carbon Matrix on Electrode Coating Quality and Performance of Practical High‐Energy‐Density Li–S Batteries Open
Li–S batteries have attracted attention as the next‐generation secondary batteries. While substantial progress is made in understanding Li–S chemistry at a fundamental level, only a limited number of studies are dedicated to achieving high…
View article: Elucidation of the Dominant Factors of Polarization in Graphite Composite Anodes for All Solid-State Lithium-Ion Batteries Using in Situ X-Ray Computed Tomography
Elucidation of the Dominant Factors of Polarization in Graphite Composite Anodes for All Solid-State Lithium-Ion Batteries Using in Situ X-Ray Computed Tomography Open
View article: Hierarchical Reaction Analysis of the Effect of High-Temperature Storage on the Electrode Characteristics and Safety of High-Nickel Cathodes
Hierarchical Reaction Analysis of the Effect of High-Temperature Storage on the Electrode Characteristics and Safety of High-Nickel Cathodes Open
View article: Imaging Liquid Water in a Polymer Electrolyte Fuel Cell with High-Energy X-ray Compton Scattering
Imaging Liquid Water in a Polymer Electrolyte Fuel Cell with High-Energy X-ray Compton Scattering Open
Compton scattering imaging with intense, high-energy synchrotron X-rays allows us to visualize a light element substance in an operating electrochemical device. In this paper, we report the first experiment of Compton scattering imaging (C…
View article: Nanorod Structuring of IrO<sub><i>x</i></sub> on a Unique Microstructure of Sb-Doped Tin Oxide to Dramatically Boost the Oxygen Evolution Reaction Activity for PEM Water Electrolysis
Nanorod Structuring of IrO<sub><i>x</i></sub> on a Unique Microstructure of Sb-Doped Tin Oxide to Dramatically Boost the Oxygen Evolution Reaction Activity for PEM Water Electrolysis Open
Proton exchange membrane water electrolysis (PEMWE) is being actively developed as a promising technology to produce high-purity hydrogen. While PEMWE has been commercialized, a serious roadblock for wider deployment is the high cost assoc…
View article: Properties of Composite Electrodes for All-solid-state Fluoride-ion Secondary Batteries Processed by High-pressure Torsion
Properties of Composite Electrodes for All-solid-state Fluoride-ion Secondary Batteries Processed by High-pressure Torsion Open
All-solid-state fluoride-ion batteries (FIBs) using metal/metal fluorides are expected to be the next generation of storage batteries because they exhibit high volumetric energy densities by utilizing multielectron reactions, compared to t…
View article: Unique Li deposition behavior in Li<sub>3</sub>PS<sub>4</sub> solid electrolyte observed <i>via operando</i> X-ray computed tomography
Unique Li deposition behavior in Li<sub>3</sub>PS<sub>4</sub> solid electrolyte observed <i>via operando</i> X-ray computed tomography Open
Herein, three-dimensional morphological changes within Li 3 PS 4 electrolyte away from the anode were observed using operando X-ray computed tomography; electronic conduction of decomposition and the electrolyte/void interface cause Li dep…
View article: Potassium-rich antiperovskites K<sub>3</sub>HTe and K<sub>3</sub>FTe and their structural relation to lithium and sodium counterparts
Potassium-rich antiperovskites K<sub>3</sub>HTe and K<sub>3</sub>FTe and their structural relation to lithium and sodium counterparts Open
Unlike perovskite oxides, antiperovskites M 3 HCh and M 3 FCh (M = Li, Na; Ch = S, Se, Te) mostly retain their ideal cubic structure owing to anionic size flexibility and low-energy phonon modes that promote their ionic conductivity.
View article: Revealing Impacts of Anion Defect Species on Fluoride-Ion Conduction of Ruddlesden-Popper Oxyfluoride Ba<sub>2</sub>ScO<sub>3</sub>F
Revealing Impacts of Anion Defect Species on Fluoride-Ion Conduction of Ruddlesden-Popper Oxyfluoride Ba<sub>2</sub>ScO<sub>3</sub>F Open
Mixed anion oxyfluorides are one of promising candidates of fast fluoride-ion conductor for all-solid-state fluoride-ion batteries. In order to establish scientific guidelines for further development of oxyfluoride-based solid electrolyte,…
View article: Adaptive Cation Pillar Effects Achieving High Capacity in Li‐Rich Layered Oxide, Li<sub>2</sub>MnO<sub>3</sub>‐LiMeO<sub>2</sub> (Me = Ni, Co, Mn) (Small 42/2022)
Adaptive Cation Pillar Effects Achieving High Capacity in Li‐Rich Layered Oxide, Li<sub>2</sub>MnO<sub>3</sub>‐LiMeO<sub>2</sub> (Me = Ni, Co, Mn) (Small 42/2022) Open
Lithium-Ion Batteries In article number 2203412, Satoshi Hiroi, Masatsugu Oishi, Koji Ohara, and co-workers, discuss the pillar effect that supports the lithium layer structure upon charging in a lithium-rich layered oxide, LixNi0.15Co0.19…
View article: Adaptive Cation Pillar Effects Achieving High Capacity in Li‐Rich Layered Oxide, Li<sub>2</sub>MnO<sub>3</sub>‐LiMeO<sub>2</sub> (Me = Ni, Co, Mn)
Adaptive Cation Pillar Effects Achieving High Capacity in Li‐Rich Layered Oxide, Li<sub>2</sub>MnO<sub>3</sub>‐LiMeO<sub>2</sub> (Me = Ni, Co, Mn) Open
Intensive research is underway to further enhance the performance of lithium‐ion batteries (LIBs). To increase the capacity of positive electrode materials, Li‐rich layered oxides (LLO) are attracting attention but have not yet been put to…
View article: Electrochemical Methods for Water Electrolysis Electrodes and Electrocatalysts
Electrochemical Methods for Water Electrolysis Electrodes and Electrocatalysts Open
View article: Improvement of Visible‐Light H<sub>2</sub> Evolution Activity of Pb<sub>2</sub>Ti<sub>2</sub>O<sub>5.4</sub>F<sub>1.2</sub> Photocatalyst by Coloading of Rh and Pd Cocatalysts
Improvement of Visible‐Light H<sub>2</sub> Evolution Activity of Pb<sub>2</sub>Ti<sub>2</sub>O<sub>5.4</sub>F<sub>1.2</sub> Photocatalyst by Coloading of Rh and Pd Cocatalysts Open
Pb 2 Ti 2 O 5.4 F 1.2 modified with various metal cocatalysts was studied as a photocatalyst for visible‐light H 2 evolution. Although unmodified Pb 2 Ti 2 O 5.4 F 1.2 showed negligible activity, modification of its surface with Rh led to …
View article: Fast fluoride ion conduction of NH4(Mg1-xLix)F3-x and (NH4)2(Mg1-xLix)F4-x assisted by molecular cations
Fast fluoride ion conduction of NH4(Mg1-xLix)F3-x and (NH4)2(Mg1-xLix)F4-x assisted by molecular cations Open
View article: Multiscale and hierarchical reaction mechanism in a lithium-ion battery
Multiscale and hierarchical reaction mechanism in a lithium-ion battery Open
The key to improving the performance of lithium-ion batteries is to precisely elucidate the temporal and spatial hierarchical structure of the battery. Lithium-ion batteries consist of cathodes and anodes and a separator containing an elec…
View article: Magnetic Compton Scattering Study of Li-Rich Battery Materials
Magnetic Compton Scattering Study of Li-Rich Battery Materials Open
The redox process in a lithium-ion battery occurs when a conduction electron from the lithium anode is transferred to the redox orbital of the cathode. Understanding the nature of orbitals involved in anionic as well as cationic redox reac…
View article: Recent Progress on Mixed-Anion Materials for Energy Applications
Recent Progress on Mixed-Anion Materials for Energy Applications Open
Mixed-anion compounds, in which multiple anions such as O2−, N3−, and H− are contained in the same compound, have recently attracted attention. Because mixed-anion compounds have a unique crystal structure with multiple anions coordinated …
View article: Fast Fluoride Ion Conduction in Molecular Cation-Containing Compounds, NH4(Mg1-xLix)F3-x and (NH4)2(Mg1-xLix)F4-x
Fast Fluoride Ion Conduction in Molecular Cation-Containing Compounds, NH4(Mg1-xLix)F3-x and (NH4)2(Mg1-xLix)F4-x Open
Aiming development of the fast anion conductors, we proposed a new material design using flexible molecular cation as a host cation, and demonstrated it with fluoride ion conduction in NH 4 (Mg 1- x Li x )F 3- x and (NH 4 ) 2 (Mg 1- x Li x…