Gs Yuasa International Ltd.

National Institute of Advanced Industrial Science and Technology

Yoshiteru Kawabe

Tadashi Kakeya

Tetsuo Sakai

Manabu Kanemoto

Masanori Morishita

Tetsuya Ozaki

Seijiro Ochiai

Aki Nakashima

The present invention provides a hydrogen absorption alloy, which includes chemical composition represented by the general formula M1M2M3CaMgNiM4wherein 16&#xd7;(d&#x2212;1.870)/(d&#x2212;r)&#x2266;v&#x2266;16&#xd7;(d&#x2212;1.860)/(d&#x2212;r); 1.6&#x2266;w&#x2266;3.2; 4.1&#x2266;&#xd7;&#x2266;5.1; 3.2&#x2266;(y+z)/(t+u+v+w+x)&#x2266;3.4; t +u+v+w+x+y+z=100; M1 is one or more elements selected from La, Pr, and Nd; M2 is one or more elements selected from V, Nb, Ta, Ti, Zr, and Hf; M3 is one or more elements selected from Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; M4 is one or more elements selected from Co, Mn, Al, Cu, Fe, Cr, and Zn; d is an average atomic radius of the elements selected as M1; and r is an average atomic radius of the elements selected as M3; and an electrode and a secondary battery using the same.

Hydrogen absorption alloy, hydrogen absorption alloy electrode, and secondary battery

A compound having a high reduction resistance and being capable of sufficiently performing a function as an electronic conductive additive when added to a positive electrode active material as an electronic conductive additive is provided. In a method for producing a cobalt cerium compound including a step of depositing a hydroxide containing cobalt and cerium in an aqueous solution containing cobalt ions and cerium ions by changing the pH of the aqueous solution and thereafter performing a treatment of oxidizing the hydroxide, the ratio of the cerium ions contained in the aqueous solution containing the cobalt ions and the cerium ions is set to be more than 5% by atom and 70% by atom or less with respect to the sum of the cobalt ions and the cerium ions before the hydroxide is deposited.

Cobalt cerium compound, alkaline secondary battery, and method for producing cobalt cerium compound

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Kyoto, Japan

Yoshiteru Kawabe