The Journal of Physical Chemistry C 124(31) 16758-16762 2020年8月
The research and development of secondary batteries, such as the lithium-ion batteries, have been widely conducted. Most electrodes are of composite type and comprise an active material, a conductive additive, and a binder. To achieve a precise an...
Takayuki Konya   Yuji Shiramata   Tatsuya Nakamura   
BUNSEKI KAGAKU 68(10) 793-800 2019年10月
An electrochemical cell with a specifically designed X-ray window was fabricated in order to evaluate the structural evolution of the cathode material under the operating condition. It enabled us to obtain strong signals from a positive electrode ...
Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 50(8) 613-617 2003年
Polycrystalline Ba3Co2Fe24O41 specimens were fabricated by usual solid state sintering or spark plasma sintering method. SEM observation showed that densification occurred simultaneously with grain growth in the solid state sintering. The spark pl...
Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 50(8) 609-612 2003年
Polycrystalline Li-Zn ferrites were prepared by the ceramic sintering method, and their complex permeability spectra were measured. The low-frequency permeability decreased with an increase in the Li-ferrite fraction. However, the natural resonanc...
T. Nakamura   T. Miyamoto   Y. Yamada   
Journal of Magnetism and Magnetic Materials 256(1-3) 340-347 2003年1月
Polycrystalline Li-Zn ferrites were prepared by the usual ceramic sintering method, and their complex permeability spectra were measured. The low-frequency permeability increased with the fraction of Zn ferrite. However, the natural resonance freq...
JOURNAL OF THE ELECTROCHEMICAL SOCIETY 149(5) A509-A524 2002年5月
LiFeO2-Li2MnO3 solid solution was synthesized using solid-state reaction and hydrothermal-postannealing methods and characterized as a positive electrode material for rechargeable lithium batteries. Although the maximum Fe content [Fe/(Fe + Mn)] w...