Electrical Resistivity of Natural Graphite-Fluorine Resin Composite for Bipolar Plates of Phosphoric Acid Fuel Cell(PAFC) Depending on Graphite Particle Size

Sang-Min Lee; Un-Gyeong Beak; Tae-Jin Kim; Jae-Seung Roh

doi:10.3740/MRSK.2017.27.12.664

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2017 Vol.27, Issue 12 Preview Page Next Page

Electrical Resistivity of Natural Graphite-Fluorine Resin Composite for Bipolar Plates of Phosphoric Acid Fuel Cell(PAFC) Depending on Graphite Particle Size 인산형 연료전지 분리판용 천연흑연-불소수지계 복합재료의 흑연입도에 따른 전기비저항 변화

December 2017. pp. 664-671

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Abstract

A composite material was prepared for the bipolar plates of phosphoric acid fuel cells(PAFC) by hot pressing a flake type natural graphite powder as a filler material and a fluorine resin as a binder. Average particle sizes of the powders were 610.3, 401.6, 99.5, and 37.7 μm. The density of the composite increased from 2.25 to 2.72 g/cm³ as the graphite size increased from 37.7 to 610.3 μm. The anisotropy ratio of the composite increased from 1.8 to 490.9 as the graphite size increased. The flexural strength of the composite decreased from 15.60 to 8.94MPa as the graphite size increased. The porosity and the resistivity of the composite showed the same tendencies, and decreased as the graphite size increased. The lowest resistivity and porosity of the composite were 1.99 × 10⁻³ Ωcm and 2.02 %, respectively, when the graphite size was 401.6 μm. The flexural strength of the composite was 10.3MPa when the graphite size was 401.6 μm. The lowest resistance to electron mobility was well correlated with the composite with lowest porosity. It was possible the flaky large graphite particles survive after the hot pressing process.

Keywords

phosphoric acid fuel cell(PAFC)

bipolar plates

particle size

resistance

composite

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 27
No :12
Pages :664-671
Received Date : 2017-08-28
Revised Date : 2017-11-02
Accepted Date : 2017-11-06
DOI :https://doi.org/10.3740/MRSK.2017.27.12.664

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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