Ribbed electrode substrates

Details Ribbed electrode substrates Ribbed electrode substrates

H - Electricity

01

M

319/21

H01M 8/02 (2006.01) H01M 4/86 (2006.01) H01M 4/96 (2006.01)

Patent

CA 1186370

Ribbed Electrode Substrates Abstract A ribbed substrate for an electrochemical cell electrode is made from a mixture of carbon fibers and carbonizable resin and has a mean pore size in the ribs which is 60-75% of the mean pore size of the web portions of the substrate which interconnect the ribs. Preferably the mean pore size of the web portion is 25-45 microns, and, if the substrate includes edge seals parallel to the ribs, the edge seals preferably have a mean pore size no greater than about ten microns. Most preferably the sub- strate has the same ratio of carbon fibers to polymeric carbon in all areas, including the ribs, webs, and edge seals. A substrate according to the present invention will have better overall performance than prior art sub- strates and minimizes the substrate thickness required for the substrate to perform all its functions well.

409063

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