Flexible Rollable Carbon Paper for Fuel Cells

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Solution Overview

Problem

Current carbon paper production methods for fuel cells are inefficient, environmentally harmful, and difficult to scale for continuous production due to their brittle nature and high energy consumption, limiting the performance and durability of fuel cells.

Innovation Solution

A flexible rollable carbon paper is developed using non-woven technology to uniformly blend carbon fibers of different lengths, which are then laminated with thermoplastic resin films and subjected to continuous heat treatment, enabling uniform distribution of fibers and pores, reducing environmental impact, and facilitating continuous production.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional wet copying combined with liquid thermosetting resin impregnation - carbonization process is used, then carbon paper can be produced, but the preparation cycle is long and energy consumption is high

Engineering Contradiction:

Improvepreparation cycleVSAvoidenergy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent changes the fundamental parameters of the carbonization process by using a fluidized bed reactor with controlled temperature (200-1000°C) and gas flow rates (0.5-5 L/min). This transforms the traditional batch process into a continuous or semi-continuous process, reducing preparation time from days to hours while lowering energy consumption through efficient heat transfer in the fluidized bed environment.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the traditional mechanical wet copying and manual impregnation processes with an automated fluidized bed system. The mechanical mixing and manual handling are substituted by gas-flow-driven fluidization, where carbonized particles are suspended and coated uniformly by the resin solution flowing through the expanded bed, significantly reducing process time and energy use.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of manufacture

If flake carbon fiber paper is used, then carbon paper can be produced, but it is thin and brittle and does not facilitate continuous production

Engineering Contradiction:

Improvecontinuous production capabilityVSAvoidflexibility and brittleness

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent applies local quality by using spherical carbonized particles with controlled size distribution (0.1-2.0 mm) as the base material. These spherical particles provide uniform local structure throughout the paper, eliminating the anisotropic properties of flake carbon fiber. The spherical morphology ensures consistent mechanical properties and flexibility in all directions, enabling continuous production without brittleness issues.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent creates a composite structure by combining carbonized spherical particles with thermosetting resin matrix. This composite approach integrates the advantages of both materials: the spherical carbon particles provide structural integrity and electrical conductivity, while the resin matrix provides flexibility and binding, resulting in a material that is both strong and flexible, suitable for continuous production.

Inventive Principle:

Principle #40Composite materials

3Object-affected harmful factors

If traditional carbon fiber paper production method is used, then carbon paper can be produced, but it causes environmental pollution

Engineering Contradiction:

Improveenvironmental pollutionVSAvoidproduction efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent uses an inert atmosphere (nitrogen or carbon dioxide) in the fluidized bed reactor during the carbonization process. This prevents unwanted oxidation and combustion of carbonized particles, eliminating harmful emissions. The inert gas also serves as a fluidizing medium, maintaining production efficiency while creating a clean, environmentally friendly process that can be continuously operated.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The resulting carbon paper exhibits improved electrical properties, thermal conductivity, flexibility, and rollability, with enhanced performance and stability, supporting efficient fuel cell operations while minimizing environmental harm.

Implementation Method 1

expanding a fluidized bed comprising the carbonized particles with a gas flow rate of 0.5 ̃5 L/min

Methodology Applied

Scientific EffectFluidization: Fluidisation

Implementation Method 2

impregnating the expanded fluidized bed with a thermosetting resin solution, and curing the thermosetting resin solution

Methodology Applied

Scientific EffectThermosetting:

Data Source

PatentUS20230416989A1Carbon fiber paper, flexible rollable carbon paper made from the carbon fiber base paper and the preparation methods and systems thereof

Publication Date: 2023.12.28 SHANGHAI JAZZ NEW MATERIAL TECH CO LTD

AI summary

The present application discloses a flexible rollable carbon paper, and the carbon paper has a thickness of 0.15˜0.25 mm, a volume density of 0.20˜0.45 g/cm3, and a porosity of 70˜90%; a flexible strength of 2060 Mpa, and a bending degree of 60˜180°; a surface resistivity ≤100 mΩ-cm; and a thermal conductivity ≥0.8 W/(m·K). The present application also discloses the processing technology and related processing systems of the paper and its intermediates.