| 초록 |
The development trend of bipolar plates at fuel cell has moved from graphite plates toward carbon composites owing to the various merits: light weight, wide process window, low cost, and fast manufacturing process. Generally, bipolar plates using carbon composites are composed of polymer matrix, graphite, carbon fiber, and some additives such as CNT, carbon black, PVDF, etc. Carbon fiber plays the important roles of mechanical reinforcement and electrical conductivity at bipolar plates. Compared with short carbon fiber (chopped carbon fiber), resin-coated long carbon fiber can show versatile advantages: high mechanical strength and high electrical conductivity at low contents. Fuel cell using bipolar plate with 15% resin-coated long carbon fibers revealed the high flexural strength of 74Mpa and high electrical conductivity of 123S/cm, which resulted in the improved current density of 50%, compared with that of 36MPa in flexural strength and 3S/cm in electrical conductivity. |
