Ion Exchange Material Supercapacitor Desalination Electrode
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Solution Overview
Problem
Supercapacitor desalination devices face inefficiencies due to the unwanted migration of similarly charged ions during charging and discharging steps, which consumes extra current and impurities the feed stream, necessitating controlled ion migration.
Innovation Solution
Incorporating an ion exchange material that is permeable to oppositely charged ions but at least partially impermeable to similarly charged ions into the electrode assembly, either within the porous material or as a surface coating, to manage ion migration effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If ion exchange material is added to the electrode assembly, then current efficiency is improved, but device complexity increases
Solution Approach 1:
The ion exchange material is integrated within the porous structure of the electrode, nesting the ion exchange function inside the existing electrode framework. This allows the ion exchange material to be housed within the electrode's pore volume, utilizing the existing structural space rather than adding external components.
Solution Approach 2:
The electrode assembly is formed as a composite structure combining conductive electrode material with ion exchange material. The patent describes mixing the ion exchange material with electrode material or coating it on the electrode surface, creating a composite that simultaneously provides electrical conductivity and selective ion exchange properties.
2Manufacturing precision
If ion exchange material loading is increased, then purification performance is improved, but manufacturing complexity increases
Solution Approach 1:
The ion exchange material is incorporated into the electrode assembly during the manufacturing process before the device is put into service. The patent describes forming a mixture of electrode material and ion exchange material, dispensing it as a paste, and molding it to create the electrode assembly, thereby pre-integrating the ion exchange functionality.
Solution Approach 2:
The patent optimizes the loading amount of ion exchange material to achieve desired current efficiency (40-99%) while maintaining manufacturability. By adjusting the concentration and amount of ion exchange material in the mixture or coating, the purification performance can be tuned without excessively complicating the manufacturing process.
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 approach enhances current and energy efficiency by preventing the expulsion of similarly charged ions and improving the purification process, with current efficiency ranging from 40% to 99% depending on the ion exchange material loading.
Implementation Method 1
an ion exchange material in contact with the porous material of the chargeable electrode, where the ion exchange material is similarly charged as the chargeable electrode, and where the ion exchange material is permeable to the oppositely charged ions and at least partially impermeable to similarly charged ions
Implementation Method 2
The ionic species in the feed stream are adsorbed on the surface of the oppositely charged electrodes, thereby de-ionizing the feed stream to produce a dilute output
Data Source
AI summary
An electrode assembly is provided. The assembly includes a chargeable electrode configured to adsorb oppositely charged ions, where the electrode comprises a porous material. The assembly further includes an ion exchange material in contact with the porous material of the chargeable electrode, where the ion exchange material is similarly charged as the chargeable electrode, and where the ion exchange material is permeable to the oppositely charged ions and at least partially impermeable to the similarly charged ions.