Electrochromic Device Structures with Ion-Isolating Mechanism
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Solution Overview
Problem
Conventional electrochromic (EC) devices for smart windows face challenges in reducing fabrication costs, power consumption, and maintaining durability under UV, thermal, and cycling conditions, often requiring complex machinery and precise coordination of electrode materials, which increases costs and reduces flexibility in design.
Innovation Solution
The development of EC devices with a multilayer film structure incorporating a redox dye-containing layer isolated from the EC layer by an electrolyte, using hydrophobic ionic liquids and a selective ion conduction layer to enhance memory and reduce power consumption, allowing the devices to maintain coloration states without continuous voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional EC devices use complex machinery and precise coordination of electrode materials, then manufacturing precision is improved, but device complexity and fabrication cost increase
Solution Approach 1:
The patent combines the counter electrode layer and electrolyte layer into a single integrated layer, eliminating the need for separate deposition processes and precise coordination between multiple layers. This merging simplifies the fabrication process while maintaining the functional requirements of both layers through the use of conductive polymers that provide both ionic conductivity and electrochemical activity.
Solution Approach 2:
The conductive polymer electrolyte serves multiple functions simultaneously: it acts as the electrolyte medium for ion transport, provides the counter electrode function for electrochromic reactions, and offers mechanical flexibility for device bending. This multi-functionality reduces the number of separate components needed and simplifies the overall device structure.
2Ease of operation
If EC devices require continuous voltage application to maintain coloration states, then optical control is improved, but power consumption increases
Solution Approach 1:
The device utilizes photochromic materials that automatically respond to UV light exposure by changing their optical properties without requiring continuous electrical power. The materials self-regulate their coloration state based on ambient UV conditions, eliminating the need for continuous voltage application while maintaining optical control functionality.
Solution Approach 2:
The patent employs materials that change their optical parameters (absorption, transmission) in response to environmental parameters (UV intensity, temperature) rather than requiring continuous electrical parameter control. This passive response mechanism significantly reduces power consumption while maintaining effective optical control.
3Ease of manufacture
If EC devices use standard materials without UV stabilizers, then fabrication cost is reduced, but durability under UV conditions deteriorates
Solution Approach 1:
The patent uses composite materials consisting of conductive polymers combined with UV-absorbing stabilizers integrated into the same layer. This composite structure provides both the electrical/ionic conductivity needed for EC function and the UV protection needed for durability, achieving both goals simultaneously without requiring separate protective layers.
Solution Approach 2:
The patent converts the potentially harmful UV radiation into a beneficial function by using photochromic materials that utilize UV exposure to trigger desirable optical changes. The UV light that would normally degrade materials is instead harnessed to activate the photochromic effect, providing both control functionality and protection through the same mechanism.
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 results in durable, low-power-consuming EC devices that can reversibly cycle between optical states, providing improved UV stability, thermal durability, and reduced fabrication costs, while maintaining coloration states with minimal power usage, thus enhancing energy efficiency and reducing maintenance needs.
Implementation Method 1
The redox dye is isolated from the EC layer by an electrolyte layer
Implementation Method 2
a selective ion conduction layer to enhance memory and reduce power consumption
Implementation Method 3
using hydrophobic ionic liquids and a selective ion conduction layer to enhance memory and reduce power consumption
Implementation Method 4
EC devices allow the color, opacity, and/or transparency of the substrate to change
Data Source
AI summary
An integrated window structure having opposing substrates that sandwich an electrochromic coating, a dye layer and an ion-isolating mechanism. In some embodiments, this is a selective ion-conductive layer and other embodiments incorporate nanostructures and polymers to tether the dye ions; these methods prevent dye ions from transporting into the electrochromic layer during redox activity. Control and systems to integrate the electrochromic elements in windows is provided.