K. Ishidzu   Y. Oka   T. Nakamura   
Solid State Ionics 288 176-179 2016年5月 [査読有り]
The structural change of Li[Ni Co Mn ]O cathode materials (x + y + z = 1) during the electrochemical delithiation/lithiation was studied with the in-situ X-ray diffraction. It was found that the cathode having the larger Ni fraction of Ni gave the...
Yoshihiro Oka   Tomoya Sasaki   Hideyoshi Matsumoto   Tatsuya Nakamura   
SOLID STATE IONICS 288 167-170 2016年5月
LiCo1/3Ni1/3Mn1/3O2 cathode electrodes were prepared using the doctor blade technique, where distilled water was used instead of ordinary NMP as the solvent. A serious problem is caused because the dispersion of hydrophobic carbon particles used a...
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 31(4) 940-947 2016年
Glow discharge-optical emission spectroscopy (GD-OES) was evaluated for hydrogen analysis in diamondlike carbon (DLC) films. DLC film samples were prepared using the plasma-based ion-implantation and deposition method (PBIID). Their hydrogen conte...
Y. Oka   T. Obata   Y. Nishimura   T. Nakamura   
Journal of the Electrochemical Society 162(2) A3032-A3037 2015年 [査読有り]
Diamond-like carbon film (DLC) is selected as a cathode-protective film because it has chemical inertness, mechanical hardness, and high electrical resistivity. For this study, a DLC protective film was deposited onto a cathode electrode rather th...
Lithium-nickel layered oxides were prepared by the solid-state reaction at temperature range of 700-850℃ in O_2 atmosphere. The structural refinement with the help of Rietveld analysis showed that the crystal structure of these compounds were iden...