Extraction for porosity in polymer cells
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United States of America Patent
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Jul 27, 1999
Issued Date -
N/A
app pub date -
May 27, 1997
filing date -
May 8, 1995
priority date (Note) -
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Abstract
A method for production of porous electrodes and separators in polymer type electrochemical cells and batteries wherein electrodes and separator elements are mixed with polymeric filler materials such as dibutyl phthalate (DBP). The polymeric filler material is then removed to provide the requisite porosity for the electrodes and separator. The polymeric filler material, normally removed by use of volatile solvents, is instead removed by extraction with supercritical fluids, such as CO.sub.2, which do not result in any hazardous residue or gases.
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