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LOW IMPURITY LSM POWDER FOR SOFC CATHODES

IP.com Disclosure Number: IPCOM000249475D
Publication Date: 2017-Feb-28
Document File: 2 page(s) / 9K

Publishing Venue

The IP.com Prior Art Database

Related People

Andres Leming: INVENTOR [+3]

Abstract

Compositional modification of a solid oxide fuel cell (SOFC) cathode material to improve performance.

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LOW IMPURITY LSM POWDER FOR SOFC CATHODES

Brief Abstract

Compositional modification of a solid oxide fuel cell (SOFC) cathode material to improve performance.

Problem Description

Among the various requirements for SOFC cathodes are stability and high conductivity. We have identified four (4) impurities which at high levels (greater than 60 ppm) can adversely affect performance in perovskite-based cathode materials such as LSM, LSCF, LSC, LSCN, etc. These performance-limiting impurities are: silicon (Si), sodium (Na), phosphorus (P), and calcium (Ca). Additionally, we have identified limits on these and additional impurities which appear to be necessary to get consistently high performance from LSM materials. These impurity levels are applicable to any cathode perovskite material with purity of greater than 99% major constituents.

These limits are as follows (ppm):

Ba < 80, preferably < 50 Si < 60, preferably < 30 Al < 50, preferably < 10 Na < 50, preferably < 30 K < 100, preferably < 50 S < 100, preferably < 90 P < 60, preferably < 50 Zr < 800, preferably < 250 Mg < 70, preferably < 10 Ca < 800, preferably < 110 Cr < 50, preferably < 10 Fe < 100, preferably < 50

Solution

These lower impurity levels can be achieved by various methods. One method is utilizing low impurity precursors during the powder synthesis. Another method involves the equipment used for powder synthesis. This can involve either changing the materials used for process and reaction vessels or monitoring equi...