Patent ID: 8685288
Filing Date: 2014-04-01
Classification: H01M,Y02E

Abstract:
1. A solid-solution method for producing an iron-containing active material to be used in a metal electrode of a rechargeable oxide-ion battery cell comprising the steps: i) providing iron-containing specie (α); ii) providing supporting specie (β) containing an element of X, where X is not iron; iii) mixing the Fe-containing specie (α) and the supporting specie (β) to produce a α+β mixture; iv) subjecting the mixture to a high temperature treatment for a period of time effective to produce a solid solution of Fe—X—O, where Fe and X are homogeneously distributed at the microscopic level; and v) reducing the solid solution of Fe—X—O to provide metallic Fe interwoven with X oxide(s), where the reduction causes loss of oxygen to produce porous Fe-containing active material.