Composite Carbon Paper Electrode for Corrosion-Resistant Aqueous Cells
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Solution Overview
Problem
Metal electrodes in electrochemical devices experience hydrogen evolution corrosion and electrochemical corrosion when using an aqueous electrolyte due to the influence of the electrolyte's potential window and reaction potential.
Innovation Solution
A manufacturing method using a composite carbon paper electrode with a phase conversion process to improve adhesion between the slurry and carbon fiber cloth, replacing metal electrodes, which includes coating a slurry on the cloth, immersing it in water for phase conversion, and drying to form a conductive film layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal electrode is used in an aqueous electrolyte system, then good electrical conductivity is achieved, but hydrogen evolution corrosion and electrochemical corrosion occur
Solution Approach 1:
The patent uses a composite structure consisting of a carbon fiber cloth substrate combined with a conductive slurry coating containing carbon black, acetylene black, ketjen black, or carbon nanotubes. This composite carbon paper electrode combines the mechanical strength and corrosion resistance of carbon fiber with the high electrical conductivity of conductive carbon materials, eliminating metal corrosion while maintaining electrical performance
Solution Approach 2:
The patent changes the material composition parameters by using a slurry containing 70-90 wt% conductive carbon material, 5-20 wt% binder, and 5-20 wt% solvent. This specific composition ratio optimization ensures high electrical conductivity while maintaining structural integrity and corrosion resistance in aqueous electrolyte environments
2Reliability
If a slurry is coated on carbon fiber cloth to form an electrode, then corrosion resistance is improved, but adhesion between slurry and cloth must be enhanced
Solution Approach 1:
The patent employs a phase conversion process where the solvent in the slurry transitions from liquid to vapor through drying at 60-100°C for 1-24 hours. This phase transition removes the solvent, causing the binder to solidify and form strong adhesive bonds between the conductive carbon material and the carbon fiber cloth substrate, significantly enhancing interfacial adhesion strength
3Reliability
If the conductive carbon material content is increased to improve electrical performance, then conductivity is enhanced, but slurry composition balance is affected
Solution Approach 1:
The patent optimizes the slurry composition by maintaining conductive carbon material at 70-90 wt%, binder at 5-20 wt%, and solvent at 5-20 wt%. This balanced composition ensures sufficient electrical conductivity while maintaining proper slurry viscosity, coating uniformity, and structural stability. The specific ratio ranges allow for compositional flexibility while preserving overall slurry stability and electrode performance
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
This method reduces corrosion issues while maintaining good electrical performance, enhancing capacity and conductivity, and allowing high current charging and discharging.
Implementation Method 1
The phase conversion process includes mutual replacement of the solvent and the water, so that the binder is agglomerated and solidified in pores of the carbon fiber cloth
Implementation Method 2
a first electrode is provided, and the first electrode is placed in an aqueous electrolyte... a slurry including a conductive carbon material
Data Source
AI summary
A manufacturing method of an electrochemical device includes the following. A first electrode is provided, and the first electrode is placed in an aqueous electrolyte. Steps of manufacturing the first electrode include the following. A slurry including a conductive carbon material, a binder, and a solvent is provided. The slurry is coated on a carbon fiber cloth to form a first electrode piece. The first electrode piece is immersed in water to perform a phase conversion process. The first electrode piece is taken out of the water to be dried.