Bipolar CDI Electrode with Circular Collector and Hydrophobic Coating
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Solution Overview
Problem
Conventional CDI electrodes suffer from fouling, corrosion, and reduced long-term stability due to their quadrangular shape and protrusive current collectors, leading to non-uniform voltage and increased resistance.
Innovation Solution
A bipolar CDI electrode with a circular current collector and nano-carbon coating, along with a hydrophobic polymer coating on the inner and outer surfaces, eliminates corrosion and fouling by restricting ion adsorption to opposing surfaces, and a modular design allows for easy maintenance and repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a quadrangular CDI electrode is used, then the electrode structure is simple to manufacture, but corrosion occurs at the corners leading to non-uniform voltage and reduced long-term stability
Solution Approach 1:
The patent changes the electrode shape from quadrangular to circular. The circular current collector eliminates corners where corrosion typically occurs, ensuring uniform voltage distribution and improved long-term stability while maintaining manufacturing feasibility through standard circular fabrication processes
2Ease of operation
If a protrusive current collector is used, then electrical terminal connection is enabled, but corrosion of the protrusive structure causes cracking and current loss
Solution Approach 1:
The patent extracts and removes the protrusive current collector structure entirely. Instead of having protruding terminals that are susceptible to corrosion and cracking, the design integrates terminal connections at the plane of the circular current collector, eliminating the vulnerable protrusive portions while maintaining electrical connectivity
Solution Approach 2:
The patent employs a composite structure with a circular current collector made of corrosion-resistant material, combined with a porous electrode layer. This composite design allows terminal connections without requiring protrusive current collector extensions, reducing corrosion vulnerability while maintaining electrical performance
3Manufacturing precision
If ion exchange membranes are used in MCDI, then ion adsorption selectivity is improved, but capital expenditure increases due to expensive membranes
Solution Approach 1:
The patent applies local quality enhancement by coating specific regions of the circular current collector with conductive and catalytic materials. This localized functional coating provides ion adsorption selectivity in critical areas without requiring expensive ion exchange membranes across the entire electrode surface, thereby reducing capital expenditure while maintaining 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
The solution enhances the desalination efficiency and extends the lifespan of the water treatment apparatus by minimizing corrosion and fouling, ensuring stable long-term operation and improved ion adsorption efficiency.
Implementation Method 1
the electrodes used for CDI are generally porous carbon electrodes having a large specific surface area
Implementation Method 2
removing ionic impurities contained in raw water through the adsorption and desorption of ions in an electric double layer (EDL) formed at the charged electrode interface
Implementation Method 3
a hydrophobic polymer coating layer respectively disposed over the inner and outer circumferential surfaces of the current collector
Data Source
AI summary
A bipolar capacitive deionization (CDI) electrode includes a circular current collector having a central hole and inner and outer circumferential surfaces; a nano-carbon coating layer formed on at least top and bottom surfaces of the circular current collector; and a hydrophobic polymer coating layer respectively disposed over the inner and outer circumferential surfaces of the current collector. Maintenance and management is facilitated by a bipolar CDI electrode module configured such that individual parts are formed to be removably attached. A water treatment apparatus including the bipolar CDI electrode module exhibits high water treatment efficiency, superior long-term stability, and easy maintenance and management, while solving terminal corrosion problems due to the formation of a hydrophobic polymer coating layer on the surface of an electrode terminal.