Ionic Liquid Thermoelectric Cell Design
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Solution Overview
Problem
Current thermoelectric devices using solid-phase materials are bulky, expensive, and have limited improvements in figure of merit (ZT) values, necessitating the development of more efficient and cost-effective electrochemical cells with desirable ZT values using commonly available materials.
Innovation Solution
An electrochemical cell design featuring a nanostructured material on the electrodes' inner surfaces and an ionic liquid in electrical communication between them, which includes a nanoparticle dispersion in the ionic liquid to enhance electrical conductivity and Seebeck coefficient, achieving a figure of merit (ZT) of at least 2 at all operating temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid-phase thermoelectric materials are used, then the device structure is stable, but the device becomes bulky and expensive with limited ZT improvement
Solution Approach 1:
The patent changes the physical state parameter of the thermoelectric material from solid to liquid (ionic liquid), enabling the device to achieve high ZT values without the bulk and weight of conventional solid semiconductor materials. This phase change allows for compact device design while maintaining structural stability through the electrochemical cell configuration.
Solution Approach 2:
The patent employs a composite system combining ionic liquid (liquid phase) with electrode materials and nanostructured materials, creating a hybrid thermoelectric device that leverages the advantages of different material states. The ionic liquid provides high Seebeck coefficient and flexibility, while electrodes provide structural stability and electrical conductivity.
2Reliability
If high-performance thermoelectric materials are used, then the figure of merit (ZT) improves, but the manufacturing cost increases due to expensive and rare materials
Solution Approach 1:
The patent replaces expensive, rare thermoelectric materials with cheaper, readily available ionic liquids that can be synthesized from common chemicals. This substitution dramatically reduces material costs while maintaining or improving ZT values, making the technology economically viable for widespread application.
Solution Approach 2:
The patent changes the material composition parameter from rare semiconductors to ionic liquids, achieving high ZT values through the unique electrochemical properties of ionic liquids including high ion mobility and tunable composition, thereby eliminating dependence on expensive rare materials.
3Device complexity
If traditional solid-state materials are used, then the device has simple structure, but the Seebeck coefficient and electrical conductivity are limited
Solution Approach 1:
The patent changes the charge carrier mechanism parameter from electron-based conduction in solids to ion-based conduction in liquids. This fundamental parameter change enables the ionic liquid to exhibit exceptionally high Seebeck coefficients (up to 10 times higher than conventional materials) while maintaining practical device complexity through the electrochemical cell structure.
4Duration of action of stationary object
If conventional thermoelectric materials are used, then the device is durable, but the form factor is large and inefficient for waste heat conversion
Solution Approach 1:
The patent changes the thermoelectric material phase from solid to liquid, enabling compact device design with reduced volume and form factor. The ionic liquid's fluidity allows for flexible device configurations that can be scaled down while maintaining durability through proper electrode and cell design, making the device efficient for various waste heat conversion applications.
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 electrochemical cell design results in a lighter, more efficient thermoelectric device with improved ZT values, utilizing cheaper materials and smaller form factors compared to conventional semiconductor-based devices, effectively converting waste heat into electricity.
Implementation Method 1
Thermoelectricity is the conversion between heat and electricity. All materials can exhibit thermoelectric effects, but the term 'thermoelectric' typically describes materials that show a strong thermoelectric effect and have a high Seebeck coefficient. Thermoelectric materials generate electricity when subjected to a temperature gradient.
Implementation Method 2
Thermoelectric materials generate electricity when subjected to a temperature gradient. The rate at which energy is conducted as heat between two bodies is a function of the temperature difference (temperature gradient) between the two bodies and the properties of the conductive medium through which the heat is transferred.
Data Source
AI summary
An electrochemical cell comprises a first electrode having a first inner surface; a second electrode having a second inner surface, the second inner surface facing the first inner surface; a nanostructured material positioned on at least one of the first inner surface and second inner surface; and an ionic liquid positioned between the first inner surface and the second inner surface, the ionic liquid being in electrical communication with the first electrode and second electrode.