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Metal Current Collector Protected by Oxide Film

Lawrence Berkeley National Laboratory

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Technology Marketing SummarySteven Visco, Craig Jacobson, and Lutgard DeJonghe have designed a cost-efficient, structurally sound technology for current collection and cell-to-cell interconnection of high temperature (>600 C) planar electrochemical devices. Current collection is normally achieved using expensive metal oxides or metals such as platinum or nickel. DescriptionBerkeley Lab's technology consists of a metal screen or metal felt made substantially of inexpensive ferritic steel coated with a thin oxide film, such as LaCrO3. (FeCr-based alloys can also be coated with nickel and a catalyst can be added.) The thin-film coated metal screen is heated in an oxidizing atmosphere at temperatures in excess of 400°C and the film coating becomes oxidized. The thin film prevents excessive oxidation of the underlying metal while providing electrical connection between the metal and the electrode of the electrochemical device. This invention allows planar-SOFC stacks to be pressed together with Ni-felt current collects on the anode side and metal-felt current collects on the cathode side. It is especially applicable to metal-supported devices but is also helpful for ceramic or cermet supported SOFCs. It is particularly useful for large cells (e.g. 1m x 1m plates) where the current path is long. Benefits* Inexpensive
* Structurally sound
Applications and Industries* Electricity production (e.g. solid oxide fuel cells)
* Electrolytic gas separation
* Electrolytic syngas production by partial oxidation
Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 6,740,441
Patent
6,740,441
Metal current collect protected by oxide film
Provided are low-cost, mechanically strong, highly electronically conductive current collects and associated structures for solid-state electrochemical devices, techniques for forming these structures, and devices incorporating the structures. The invention provides solid state electrochemical devices having as current interconnects a ferritic steel felt or screen coated with a protective oxide film.
Lawrence Berkeley National Laboratory 05/25/2004
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
IB-1656DevelopmentAvailable - * Available for exclusive or non-exclusive licensing within all fields of use with the following exception: only available for non-exclusive licensing within the field of use covering solid oxide fuel cells with electrical power output between 0.5kW and 40kW that are designed for installation as permanent fixtures in residential buildings and small commercial business facilities.06/21/201007/28/2010

Contact LBL About This Technology

To: Shanshan Li<ipo@lbl.gov>