Positive electrode for alkali secondary battery and alkali secondary battery including said positive electrode

Patent metadata

Field	Value
Publication number	US-12021223-B2
Application number	US-201917275297-A
Country	US
Kind code	B2
Filing date	Aug 15, 2019
Priority date	Sep 21, 2018
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

A battery 2 includes an outer can 10 and an electrode group 22 that is housed in the outer can 10 together with an alkaline electrolytic solution, in which a positive electrode 24 included in the electrode group 22 includes a positive electrode substrate and a positive electrode mixture supported on the positive electrode substrate, the positive electrode mixture includes nickel hydroxide and a positive electrode additive, the positive electrode additive includes a titanium oxide particle having an anatase-type crystal structure, the titanium oxide particle has an average primary particle size of 5 nm or more and 10 nm or less and a BET specific surface area of 230 m 2 /g or more and 360 m 2 /g or less, and includes 0.1% by mass or more of niobium, and a rate of addition of the titanium oxide relative to the nickel hydroxide is 0.1% by mass or more and 1.0% by mass or less.

First claim

The invention claimed is:

1. A positive electrode for an alkali secondary battery, comprising:
a positive electrode substrate; and
a positive electrode mixture supported on the positive electrode substrate,
wherein
the positive electrode mixture comprises nickel hydroxide as a positive electrode active material, and a positive electrode additive,
the positive electrode additive comprises a titanium oxide particle having an anatase-type crystal structure,
the titanium oxide particle has an average primary particle size of 5 nm or more and 10 nm or less and a BET specific surface area of 230 m 2 /g or more and 360 m 2 /g or less, and the anatase-type crystal structure comprises 0.1% by mass or more of niobium, and
a content of the titanium oxide relative to the nickel hydroxide is 0.1% by mass or more and 1.0% by mass or less, and
the titanium oxide has a purity of 90% by mass or more and 95% by mass or less.

2. An alkali secondary battery comprising:
an outer can; and
an electrode group that is housed in the outer can together with an alkaline electrolytic solution,
wherein
the electrode group comprises a positive electrode and a negative electrode stacked with a separator being interposed therebetween, and
the positive electrode is the positive electrode for an alkali secondary battery according to claim 1 .

Assignees

• Fdk Corp

Inventors

• Yamane Tetsuya
• Imoto Yuzo
• Tanimoto Yuya
• Kihara Masaru
• Asanuma Hideyuki

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/30

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

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01G53/04

  Oxides · CPC title