Method for producing roll-type gas diffusion layer having excellent spreading property
AssigneeKolon Industries, Inc.
InventorsJoon Young YOON, Da Kyoung YONG
Life of this patent
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Abstract
Disclosed is a method for producing roll-type gas diffusion layer. The method includes steps of preparing a carbon paper by using carbon fiber chops having a low modulus of 10 to 100 Gpa; impregnating the prepared carbon paper with a phenol resin or the like, and then carbonizing the same at 1,800 to 2,400° C.; forming a microporous polytetrafluoroethylene resin layer on one of both sides of the carbonized carbon paper, thus to prepare a sheet-like gas diffusion layer; and then, winding the prepared sheet-like gas diffusion layer on a roll.
Claims5
A method for producing a roll-type gas diffusion layer having excellent spreading properties, comprising:
- (i) performing heat treatment on a cellulose fiber as a carbon fiber precursor at a temperature of 1,750 to 2,450° C. to prepare a carbon fiber having a strength of 0.5 to 1.2 Gpa and a modulus of 10 to 100 Gpa;
- (ii) cutting the prepared carbon fiber in a length of 3 to 56 mm to prepare carbon fiber chops, and then introducing the same into a paper pulp-manufacturing apparatus along with a binder fiber, a surfactant, a thickener and an anti-foaming agent, so as to prepare a sheet-like carbon paper;
- (iii) impregnating the prepared carbon paper with a resin, carbonizing the same at 1,800 to 2,400° C., and then, forming a microporous polytetrafluoroethylene resin layer on one of both sides of the carbonized carbon paper, so as to prepare a sheet-like gas diffusion layer;
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- (iv) winding the prepared sheet-like gas diffusion layer on a roll.
Dependencies are inferred from the claim text.