Electrochromic Device With Ionic Liquid Electrolyte
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Solution Overview
Problem
Conventional electrochromic devices for architectural windows are non-dynamic, expensive, and prone to degradation due to heat and solar radiation, limiting their ability to adjust solar energy transmittance effectively across seasons.
Innovation Solution
An electrochromic device is designed with a combination of organic and inorganic electrochromic materials separated by an ionic liquid, using conductive metal oxides and specific polymers like poly(3-octylthiophene-2,5-diyl) and iron hexacyanoferrate, which allows for dynamic control of solar transmittance and improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrochromic materials are used, then the device can control solar energy transmittance, but the components degrade over time due to heat and solar radiation exposure
Solution Approach 1:
The patent employs a composite electrochromic system combining organic electrochromic material (such as poly(3-octylthiophene-2,5-diyl) or its derivatives) with inorganic electrochromic material (such as iron hexacyanoferrate). This composite structure leverages the complementary properties of both materials: the organic component provides flexibility and tunability while the inorganic component offers stability and durability. The combination mitigates the degradation issues of individual materials when exposed to heat and solar radiation, thereby extending component lifespan and improving overall device reliability.
2Adaptability or versatility
If conventional electrochromic devices are used, then solar energy transmittance can be controlled, but the devices are expensive to produce and install
Solution Approach 1:
The patent utilizes ionic liquids as the electrolyte medium in the electrochromic device. Ionic liquids offer unique properties including wide electrochemical stability windows, high ionic conductivity, and negligible vapor pressure. By changing the electrolyte parameter from conventional aqueous or organic solutions to ionic liquids, the device achieves improved electrochemical stability and extended operational lifetime. This parameter change enables the use of more durable electrode materials and reduces maintenance costs, ultimately lowering the overall production and installation costs while maintaining solar transmittance control functionality.
3Ease of operation
If conventional electrochromic devices are used, then color change upon electrical potential application is achieved, but the devices are slow to recover to the lightened state
Solution Approach 1:
The patent employs ionic liquids as the electrolyte medium, which possess high ionic conductivity and rapid ion transport capabilities. The ionic liquid facilitates fast movement of ions between the electrochromic layers during coloration and bleaching cycles. This hydraulic-like ion transport mechanism significantly accelerates the recovery speed of the device to its lightened state while maintaining ease of operational control through electrical potential application. The low viscosity and high mobility of ions in the ionic liquid medium enable rapid response times without compromising operational simplicity.
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 device provides enhanced dynamic control of solar energy transmittance and increased stability, reducing production and maintenance costs while maintaining high contrast and durability.
Implementation Method 1
An ionic liquid is positioned between the first electrochromic material and the second electrochromic material
Implementation Method 2
electrochromic technology. Conventional electrochromic windows use an electrochromic medium that changes color upon the application of an electrical potential
Data Source
AI summary
An electrochromic device includes a first substrate spaced from a second substrate. A first conductive member is formed over at least a portion of the first substrate. A first electrochromic material is formed over at least a portion of the first conductive member. The first electrochromic material includes an organic material. A second conductive member is formed over at least a portion of the second substrate. A second electrochromic material is formed over at least a portion of the second conductive member. The second electrochromic material includes an inorganic material. An ionic liquid is positioned between the first electrochromic material and the second electrochromic material.