A5004191310- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Supercapacitor Materials and Fabrication
- Electrocatalysts for Energy Conversion
- Semiconductor materials and devices
- Extraction and Separation Processes
- Fuel Cells and Related Materials
- Conducting polymers and applications
- Catalytic Processes in Materials Science
- Advancements in Solid Oxide Fuel Cells
- Semiconductor materials and interfaces
- Advanced battery technologies research
- Electron and X-Ray Spectroscopy Techniques
- Fiber-reinforced polymer composites
- Inorganic Fluorides and Related Compounds
- Ammonia Synthesis and Nitrogen Reduction
- Synthesis and properties of polymers
- Electrochemical Analysis and Applications
- Graphene research and applications
- Analytical Chemistry and Sensors
- Electrohydrodynamics and Fluid Dynamics
- Tribology and Wear Analysis
- Catalysis and Hydrodesulfurization Studies
- Electrochemical sensors and biosensors
Doshisha University
2015-2024
Meijo University
2015-2021
Kyocera (Japan)
2018-2020
Kyoto University
2006-2017
Kyushu University
2006-2015
Japan Society
2010-2013
Kyoto Katsura Hospital
2010
Shizuoka University
2009
Tokyo Institute of Technology
2004-2005
Musashi University
2002
On the basis of similarity between spinel and rocksalt structures, it is shown that some oxides (e.g., MgCo 2 O 4 , etc) can be cathode materials for Mg rechargeable batteries around 150 °C. The insertion into lattices occurs via “intercalation push‐out” process to form a phase in mother phase. For example, by utilizing valence change from Co(III) Co(II) at considerably high potential about 2.9 V vs. 2+ /Mg, similarly 2.3 /Mg with Mn(III) Mn(II) MgMn being comparable ab initio calculation....
In this work, we propose and examine a battery system with new design concept. The consists of non-noble polyvalent metal (such as Ca, Mg, Al) combined positive electrode already well-established for lithium ion batteries (LIBs). prototype demonstrated here is composed Mg negative electrode, LiFePO4 tetrahydrofuran solution two kinds salts (LiBF4 phenylmagnesium chloride) an electrolyte. LIB positive-electrode materials such can preferentially accommodate Li+ ions; i.e., they work "Li pass...
Magnesium-ion batteries (MIBs) with a Mg-metal negative electrode are expected to combine high energy density and electromotive force, owing the divalent ion careers its low redox potential. However, it has been reported date that cell voltage of MIBs is not enough (∼1.5 V), being far below lithium-ion (LIBs) (4–5 V). In this work, we have investigated potentiality Mg–Co–O Mg–Ni–O complex oxides as positive for MIBs, which composed these electrodes Mg in acetonitrile Mg(ClO4)2 salt an...
In situ detection of volatile organic compounds (VOCs) in the atmosphere has become particularly important because their detrimental effects on human health and environment. To develop high-performance gas sensors capable detecting VOCs ppb concentrations, we prepared SnO2 nanocrystals by a liquid-phase synthesis method. Nearly monodispersed (ca. 3.5 nm) were heating tin(IV) acetylacetonate dibenzyl ether presence oleic acid oleylamine at 280 °C. The exhibited high thermal stability against...
Various kinds of fluoroalkyl ethers were investigated as diluents to reduce the high viscosity highly concentrated LiBF4/PC electrolyte solutions. 1,1,2,2–tetrafluoroethyl 2,2,3,3–tetrafluoropropyl ether (HFE) was most suitable diluent because a solubility LiBF4. 2.50 mol kg−1 LiBF4/PC+HFE (2:1 by volume) reasonable compromise attain low (51.7 mPa s) and PC/Li molar ratio (2.39). Raman spectroscopy revealed that fraction free PC molecules in (2:1) much smaller than (PC/Li = 4.00),...
The influence of Mn-ion dissolved in electrolyte solution on the electrochemical properties graphite negative-electrodes was investigated using edge plane highly oriented pyrolytic (HOPG) by cyclic voltammetry, impedance spectroscopy, and situ atomic force microscopy (AFM). Redox currents due to intercalation de-intercalation reactions Li-ion at an HOPG electrode significantly decreased with increase cycle number. Both surface film interfacial transfer resistances remarkably increased...
Changes in the surface morphology of edge planes graphite during a potential sweep were studied using highly oriented pyrolytic (HOPG) an ethylene carbonate (EC) + diethyl (DEC)-based electrolyte solution by situ atomic force microscopy (AFM). The effects microscopic structures graphite, i.e., and basal planes, on film formation are discussed. fine particles precipitates was observed depending electrode between 1.0 0 V. These considered to be remnants blisters that could at plane...
Abstract A comprehensive understanding of the charge/discharge behaviour high-capacity anode active materials, e.g., Si and Li, is essential for design development next-generation high-performance Li-based batteries. Here, we demonstrate in situ scanning electron microscopy ( SEM) anodes a configuration analogous to actual lithium-ion batteries (LIBs) with an ionic liquid (IL) that expected be functional LIB electrolyte future. We discovered variations morphology materials during processes...
This work is devoted to fundamental electrochemistry on a novel concept of rechargeable battery, "rocking-chair type" Mg–Li dual-salt in which both Mg and Li cations are carrier ions.
Abstract not Available.
All-solid-state phosphate symmetric cells using Li3V2(PO4)3 for both the positive and negative electrodes with Li1.5Al0.5Ge1.5(PO4)3 as solid electrolyte were proposed. Amorphous was added into electrode to increase interface area between active materials electrolyte. Any other phases not formed at electrode/electrolyte even after hot pressing 600 °C. The discharge capacity 92 mAh g− 1 22 µA cm− 2 80 °C, 38 25 respectively. Symmetric cell configuration leads simplify fabrication process...
Charge and discharge properties of spinel LiNi0.5Mn1.5O4 positive electrodes were investigated using concentrated LiBF4/propylene carbonate (PC) electrolyte solutions in the range 0.833 (ca. 1 mol dm−3) to 7.25 (nearly saturated) kg−1. The irreversible decomposition solution was effectively suppressed with an increase concentration. In addition, polarization charge/discharge reactions remained small nearly saturated kg−1 LiBF4/PC even though viscosity very high ionic conductivity low. rate...
Nanosized particles of spinel Li4/3Ti5/3O4 were prepared at 673 K by an electrospray pyrolysis method for the first time. TEM observation clarified that resultant fairly uniform and particle sizes ca. 12 nm with well-defined crystal form. Cyclic voltammetry gave very sharp symmetrical redox peaks around 1.56 V vs Li/Li+ due to insertion extraction lithium ion nanosized Li4/3Ti5/3O4. These results indicate apparent fast diffusion can be attained using particles.
Surface films formed on edge plane pyrolytic graphite electrodes were characterized by attenuated total reflection (ATR)-Fourier transform infrared spectroscopy (FTIR). FTIR-ATR spectra revealed that the surface consisted mainly of LiOCO2R (R = alkyl or lithium carbonate), Li2CO3 and (CH2CH2O)n both basal planes, while formation reactions at proceeded more rapidly than those plane. The major constituents 0.1 0.8 V Li2CO3, respectively. We discuss this difference based results in literature....