Spinning solution for fuel cell and preparation method of carbon paper of spinning solution

Abstract

The invention discloses a spinning solution for a fuel cell and a preparation method of carbon paper of the spinning solution, and belongs to the technical field of carbon paper preparation. The spinning solution comprises raw materials, a solvent and an auxiliary; the mass ratio of the raw material to the solvent to the auxiliary agent is (20-50): (60-100): (1-5); the raw material comprises polyacrylonitrile; the solvent comprises one or more of dimethyl amide, dimethyl sulfoxide, sodium thiocyanate or zinc chloride; and the auxiliary agent comprises one or more of dimethyl phthalate, diethyl phthalate, di-n-butyl phthalate, dioctyl phthalate or butyl benzyl phthalate. The spinning liquid is jetted on a substrate by jet spinning to form organic cellosilk firstly and then form the carbon fiber paper. The carbon fiber paper with good thickness consistency prepared by the method has good capability of conducting electrons, water and gas, in addition, the preparation process is simple and controllable, the cost is reduced, and batch production can be realized.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a method for preparing carbon paper in a gas diffusion layer for fuel cells. Background technique [0002] Fuel cell is a high-efficiency power generation device, and the product only generates water, which is a very promising clean energy source. Fuel cells are used in a wide range of applications, from civilian to military, from small portable devices to large aerospace, automobiles and ships. Among them, the proton exchange membrane fuel cell is developing rapidly. The membrane electrode (MEA, Membrane Electrode Assembly) is the core component of the proton exchange membrane fuel cell and also the core component of power generation in the stack. The membrane electrode and the bipolar plates on both sides form the fuel cell The basic unit of a fuel cell is a fuel cell, which consists of a pole plate, a gas diffusion layer, a catalytic layer, and a proton exchange membrane. ...

AI Technical Summary

Problems solved by technology

Although the wet papermaking process is relatively mature, the carbon content of carbon fiber is very high, the surface is inert, it is difficult to disperse evenly, and the consistency of forming is very high. The thickness tolerance of paper is relatively large, generally exceeding 10 microns

The consistency of carbon paper will ultimately affect the performance and life of the stack

In addition, the carbon paper prepared by the traditional wet papermaking process is thick, which affects mass transfer and is not conducive to improving the power density of the stack.

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