Extraction for porosity in polymer cells

Details Extraction for porosity in polymer cells Extraction for porosity in polymer cells

1997-05-27

1999-07-27

Nuzzolillo, Maria

Metal working

Method of mechanical manufacture

Electrical device making

296231, 429189, 429305, H01M 1038, H01M 1040

Patent

active

059283912

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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patent: 5540741 (1996-07-01), Gozdz et al.
patent: 5690703 (1997-11-01), Mitchell et al.

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