Yoshihiro Oka   Tomoya Sasaki   Hideyoshi Matsumoto   Tatsuya Nakamura   
Solid State Ionics 288 167-170 2016年5月 [査読有り]
LiCo Ni Mn O 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 as a con...
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...
Journal of Analytical Atomic Spectrometry 31(4) 940-947 2016年4月 [査読有り]
Glow discharge-optical emission spectroscopy (GD-OES) was evaluated for hydrogen analysis in diamond-like carbon (DLC) films. DLC film samples were prepared using the plasma-based ion-implantation and deposition method (PBIID). Their hydrogen cont...
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...
R. Hanafusa   Y. Oka   T. Nakamura   
Journal of the Electrochemical Society 162(2) A3045-A3051 2015年 [査読有り]
Li-deficient olivine compounds, Li Co Fe PO (x < 0.15), were prepared by calcination of the sol-gel derived precursors in ambient atmosphere. They were almost single phase at x < 0.10 but some impurity phases were found at x > 0.10. The lattice pa...