Modification of C/C composite bipolar plate for improving electrical conductivity was carried out by addition of electroconductive carbon black (EC-CB). Carbon black was carefully mixed to methanol-containing phenolic resin, impregnated into 2D-carbon fabrics, hot pressed and then carbonized to obtain composite plate. Inclusion of electro-conductive carbon black enhanced the electrical conductivity of the C/C composites by increasing the conduction path. Addition of 10 vol% carbon black increased the electrical conductivity from 5.5/Ωcm to 32/Ωcm and reduced the crack formation by filling effect, resulting in the increase of flexural properties of composite plate. However, at carbon black content over 10 vol%, flexural properties decreased by delaminating role of excess carbon black at the interface in C/C composites.

• Seung-Kon Ryu(Division of Advanced Materials Engineering, Chungnam National University)
• Taek-Sung Hwang(Division of Advanced Materials Engineering, Chungnam National University)
• Seung-Goo Lee(Division of Advanced Materials Engineering, Chungnam National University)
• Sun-A Lee(Division of Advanced Materials Engineering, Chungnam National University)
• Chang-Soo Kim(Korea Institute of Energy Research)