Alkaline storage battery, positive electrode material for alkaline storage battery, and method for manufacturing positive electrode material for alkaline storage battery

Patent metadata

Field	Value
Publication number	US-9419273-B2
Application number	US-201314037604-A
Country	US
Kind code	B2
Filing date	Sep 26, 2013
Priority date	Sep 28, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A positive electrode material for an alkaline storage battery includes nickel hydroxide. Zn and an A element are held in solid solution in a crystallite of the nickel hydroxide, the A element being at least one element selected from the group consisting of Al, Ga, Mn, and Mo. The content of the A element, [A]/([Ni]+[A]+[Zn]), is 5 to 16% (where [A] represents the molarity of the A element,[Ni] represents the molarity of nickel, and [Zn] represents the molarity of zinc in the crystallite). [Zn]/([Ni]+[A]+[Zn]) is 1 to 10%. The nickel hydroxide includes α-phase nickel hydroxide and β-phase nickel hydroxide.

First claim

What is claimed is:

1. A positive electrode material for an alkaline storage battery, comprising nickel hydroxide, wherein:
Zn and Al are held in solid solution in a crystallite of the nickel hydroxide;
the content of the Al, [A]/([Ni]+[A]+[Zn]), is 5 to 16% (where [A] represents the molarity of Al, [Ni] represents the molarity of nickel, and [Zn] represents the molarity of zinc in the crystallite);
[Zn]/([Ni]+[A]+[Zn]) is 1 to 10%; and
the nickel hydroxide includes α-phase nickel hydroxide and β-phase nickel hydroxide.

2. The positive electrode material for an alkaline storage battery according to claim 1 , wherein Co is further held in solid solution in the crystallite of the nickel hydroxide.

3. An alkaline storage battery comprising:
a positive electrode containing the positive electrode material for the alkaline storage battery according to claim 1 ;
a negative electrode; and
an alkaline electrolyte solution.

4. A method for manufacturing the positive electrode material for an alkaline storage battery of claim 1 , comprising:
a reaction between an alkaline aqueous solution and an aqueous solution containing Ni 2+ ion, Zn 2+ ion, and Al 3+ ion;
coprecipitation of the Ni 2+ ion, the Zn 2+ ion, and the Al 3+ ion; and
preparing Al and Zn in solid solution in a crystallite of nickel hydroxide.

5. The positive electrode material for an alkaline storage battery according to claim 1 , wherein [Zn]/([Ni]+[A]+[Zn]) is 5 to 10%.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Kakeya Tadashi
• Watanabe Hideto
• Kanemoto Manabu
• Kodama Mitsuhiro

Classifications

• H01M10/30

  Nickel accumulators (H01M10/34 takes precedence) · CPC title

• H01M4/32 Primary

  Nickel oxide or hydroxide electrodes · CPC title

• C01P2002/50

  Solid solutions · CPC title

• C01P2002/52

  containing elements as dopants · CPC title

• C01G53/04 Primary

  Oxides · CPC title