Takashi Nakamura

Protective coatings on cathode active materials have become paramount for the implementation of solid-state batteries; however, the development of coatings lacks the understanding of the necessary coating properties. In this study, guidelines for the design of solid electrolytes and electrode coatings in all-solid-state batteries are proposed from the viewpoint of the steady-state Li chemical potential profile across the battery cell. The model calculation of the (electro)chemical potential prof

In this study, the efficiency of ionic transport through proton-conducting ceramic electrolytes for energy conversion applications was discussed.

Terrestrial Neutron Spectrometry and Dosimetry Irradiation Test in the Terrestrial Field Neutron Irradiation Test Facilities Review of Experimental Data and Discussions Monte Carlo Simulation Methods Simulation Results and Their Implications International Standardization of Neutron Test Method Summary and Challenges.

The oxygen vacancy containing Li-rich cathode Li_1.2Ni_0.13Co_0.13Mn_0.54O_2−δ showed excellent energy density retention.

Pb(Zr x Ti 1- x )O 3 (PZT) thin films were prepared on Ir/IrO 2 and Pt/IrO 2 electrodes. We have already reported that fatigue properties of PZT thin films were improved by using these electrodes due to barrier effects of IrO 2 . In this present paper we describe a study of the imprint characteristics of PZT thin films on these electrodes. There is little difference in fatigue properties between the PZT films on Pt/IrO 2 and Ir/IrO 2 . However, we find some difference in imprint characteristics

This study investigates the now-common action of looking at a mobile phone display, thereby offering insight into the present communication situation in an era in which the use of high-performance mobile phones has become ubiquitous. In this study, the action of looking at a mobile phone display is considered nonverbal behavior/communication. This study applies a basic, general model to elucidate the present situation of face-to-face communication in light of the increasing prevalence of social

Oxygen release from a Li-rich cathode material was quantitatively evaluated and discussed based on defect chemistry and thermodynamics.

To clarify guidelines for a high-performance mixed conducting oxide anode, electrochemical behaviors of mixed conducting oxide anodes were studied on the oxides, , , , , , , and . The hydrogen oxidation on the oxide anodes is studied by ac impedance and steady-state polarization measurements. In the ac impedance measurements, a slow relaxation process of the order of was observed with the -based and anodes. The corresponding pseudocapacitances are . These pseudocapacitances are identified as the

In order to elucidate the reaction zone in porous anodes on yttria-stabilized zirconia (YSZ), ac impedance and steady-state polarization measurements are carried out in gas mixtures with different electrode thicknesses, 7, 20, and anodes. Steady-state polarization current becomes larger as the electrode becomes thicker, while the current per unit surface area shows similar value. Therefore, the current seems to be a function of the electrode surface area. In ac impedance measurements, an extreme

In order to elucidate the electronic state and the conduction mechanism of La(2-x)Sr(x)NiO(4+delta) at high temperatures, electrical conductivity, Seebeck coefficient, and nonstoichiometric oxygen content of La(2-x)Sr(x)NiO(4+delta) (x = 0, 0.2, 0.4) were measured as a function of Sr content, temperature, and oxygen partial pressure. The hole mobility is estimated from the electrical conductivity and oxygen content. The mobility decreases slightly as temperature increases, like metals at high te

Abstract Oxide‐based cathode materials are key components of secondary batteries, for example, alkali metal‐ion and anion batteries, sufficient stability of which is thus vital for ensuring high energy density and safety. However, problems originating from the lattice oxygen instability in oxide‐based intercalation cathodes are widely reported, such as capacity degradation, gas generation, and thermal runaway, highlighting the importance of deep insights into the critical factors for lattice oxy

The interstitial oxygen formation mechanism in La2NiO4-based oxides was studied using soft X-ray absorption spectroscopy. When the interstitial oxygen concentration increased, the pre-edge peak of O K-edge spectra increased while Ni L-edge spectra was almost invariant. These spectral changes strongly suggest the significant contribution of ligand oxygen to interstitial oxygen formation by providing/accepting electronic charge carriers. The variation of the integrated peak intensity of the O K-ed

Comprehensive studies on the crystal lattice deformation due to interstitial oxygen formation in layered perovskite oxides are presented.