Time filter

Source Type

Tanaka Chemical Corporation | Date: 2013-08-27

Materials for battery manufacture, namely, nickel hydroxide, cobalt hydroxide, nickel oxyhydroxide, nickel nitrate, cobalt nitrate; Material for producing catalyst for industrial purposes, namely, cobalt carbonate; Cathode active materials for Lithium ion secondary battery, namely, manganese carbonate, lithium nickel oxide, lithium cobalt oxide, lithium manganese oxide, nickel-cobalt-manganese-containing composite oxide, nickel-cobalt-manganese-containing composite hydroxide. Catalogues in the fields of chemicals; Pamphlets in the field of chemicals.


Tanaka Chemical Corporation | Date: 2012-10-23

Nickel hydroxide; cobalt hydroxide; nickel oxyhydroxide; nickel nitrate; cobalt nitrate; nickel carbonate; cobalt carbonate for industrial purposes; manganese carbonate; lithium nickel oxide; lithium cobalt oxide; lithium manganese oxide; cobalt oxide for industrial purposes; nickel-cobalt-manganese-containing composite oxide; nickel-cobalt-manganese-containing composite hydroxide. Catalogues in the fields of chemicals; Pamphlets in the field of chemicals.

Ariyoshi K.,Osaka City University | Maeda Y.,Osaka City University | Maeda Y.,Tanaka Chemical Corporation | Kawai T.,Osaka City University | And 2 more authors.
Journal of the Electrochemical Society | Year: 2011

The 5-V lithium insertion materials of Li [Ni1/2 Mn3/2] O4 having different primary particle sizes were prepared by the two-step solid-state reaction at several temperatures and characterized by Fourier transform infrared, X-ray diffraction, and scanning electron microscopy. The primary particle size of Li [Ni1/2 Mn3/2] O4 depends on the heating temperature. High temperature synthesis gives highly crystallized Li [Ni1/2 Mn3/2] O4 having large particle sizes with smooth {111} facets of octahedra characteristic of spinel. The steady-state polarization measurements were carried out by applying the sinusoidal voltage of peak amplitude of 1 V at 0.1 Hz to the cell consisting of Li [Ni1/2 Mn3/2] O4 and Li [Li1/3 Ti5/3] O4. The well-developed primary particles prepared at 1000°C were superior to the small primary particles prepared at temperatures lower than that value in terms of polarization together with cycling stability. © 2011 The Electrochemical Society.

Uchikoshi M.,Tohoku University | Shibuya H.,Tanaka Chemical Corporation | Imaizumi J.,Tanaka Chemical Corporation | Kekesi T.,University of Miskolc | And 2 more authors.
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2010

High-purity Co was prepared with valence-controlled anion-exchange separation, oxidation refining using plasma arc melting, and H2-Ar plasma arc melting on a pilot scale. The result of a laboratory-scale experiment indicated that the slower flow rate is more effective to remove the impurities by anion-exchange separation. However, the separation efficiency is reduced by scaling up the column from the laboratory to pilot scale. The discussion of the decrease in the separation efficiency implies that the distribution coefficient increases as the concentration of the adsorbate is lowered, but a reduced slower flow rate might increase the final purity of Co. In addition to anion-exchange separation, Co oxidation refining using plasma arc melting was useful. Consequently, a high-purity Co of 99.9998 pct by mass excluding gaseous elements was prepared, which represents the highest purity reported. © The Minerals, Metals & Materials Society and ASM International 2009.

Tabuchi M.,Japan National Institute of Advanced Industrial Science and Technology | Nabeshima Y.,Japan National Institute of Advanced Industrial Science and Technology | Takeuchi T.,Japan National Institute of Advanced Industrial Science and Technology | Kageyama H.,Japan National Institute of Advanced Industrial Science and Technology | And 4 more authors.
Journal of Power Sources | Year: 2011

Equal amounts of Fe- and Ni-substituted Li2MnO3 (chemical formula: Li1+x[(Fe1/2Ni1/2) yMn1-y]1-xO2, 0 < x < 1/3, 0.2 ≤ y ≤ 0.8) were synthesized using coprecipitation-hydrothermal- calcination. Although the samples with y less than 0.5 are only monoclinic Li2MnO3-type structure (C2/m), samples with y larger than 0.6 show a two-phase nature consisting of the monoclinic phase and cubic LiFeO2 phase (Fm3̄m). Electrochemical characterization as a positive electrode shows that the Li2O extraction region disappears above y = 0.6 on initial charging and that the energy density is decreased drastically above the composition on initial discharging. The optimized transition metal ratios are y = 0.4 and 0.5 because the initial average discharge voltage increases with y and the maximum initial cycle efficiency is attained. In the optimized composition, the Fe- and Ni-substituted Li 2MnO3 is a 3.5 V class positive electrode, with similar charge and discharge profiles to those of the most attractive active material, NMC positive electrode (chemical formula: Li1+x[(Co 1/2Ni1/2)yMn1-y]1-xO 2, 0 < x < 1/3, 0.2 ≤ y ≤ 0.8). Consequently, Fe can be used as an activator in combination with Ni for constructing "Co-free" Li2MnO3-based positive electrodes. The calcination-condition-dependence of electrochemical properties at the optimized composition is also examined. The effects of the Fe valence state on initial charge-discharge curves are discussed. © 2010 Elsevier B.V. All rights reserved.

Discover hidden collaborations