Patent · US Expired

Method for producing a double hydroxide active material

US4735629A · kind A · utility

12Cited by

2References

7Claims

0Family size

Assignee

Varta Batterie Aktiengesellschaft · DE

Inventors

Oskar Glemser · Oebisfelde, DE
Dieter Buss · Aschaffenburg, DE
Jürgen Bauer · Pocking, DE

Key dates

Filing date	Jun 15, 1987
Grant date	Apr 5, 1988
Priority date	—
Expiry date	Jun 15, 2007

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49108
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A positive electrode for alkaline storage cells is disclosed. The active material for the positive electrode is a double hydroxide of the formula EQU [M.sup.2+.sub.(1-x) Fe.sup.3+.sub.x (OH).sub.2 ].sup.x+ [(x/n)X.sup.n-..sub.y H.sub.2 O].sup.x- wherein x is in the range 0.05.ltoreq.x.ltoreq.0.4, M.sup.2+ is an oxidizable and reducible, and X.sup.n- is at least one anion. The double hydroxide has a pyroaurite-like double layer structure and is electrochemically resistant to iron poisoning. In a preferred embodiment, the double hydroxide comprises [Ni.sub.4 Fe(OH).sub.10 ].sup.+ [NO.sub.3.sup.-.yH.sub.2 O].sup.-. Methods for preparing positive electrodes having the double hydroxide active material are also disclosed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.