Doped Ceramic Thermoelectric Modules for Cost Reduction
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Solution Overview
Problem
Current thermoelectric materials, such as telluride semiconductors and skutterudites, are expensive and require complex processing, limiting their incorporation of desirable features and making it difficult to construct efficient thermoelectric generators.
Innovation Solution
The use of doped semiconductive ceramic elements, specifically SrTiO3 and NiO materials with doping, in a multi-layer ceramic configuration, connected in series electrically and in parallel thermally, to create thermoelectric modules that can efficiently convert thermal energy to electrical energy using standard ceramic processing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional thermoelectric materials (telluride semiconductors, skutterudites) are used, then thermoelectric performance is achieved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent changes the material parameters by transitioning from traditional telluride semiconductors and skutterudites to doped ceramic materials (such as doped SrTiO3, doped NiO, doped BaZrO3). This parameter change enables the use of standard ceramic processing techniques instead of complex specialized processes like boule drawing, epitaxial growth, or spark plasma sintering, thereby reducing manufacturing complexity while maintaining thermoelectric functionality through doping-induced electrical properties
Solution Approach 2:
The patent employs inexpensive ceramic raw materials and standard ceramic processing methods that are widely available and cost-effective compared to specialized thermoelectric material fabrication. The use of conventional ceramic sintering and doping techniques replaces expensive, specialized processing equipment and procedures, making thermoelectric generator construction more accessible and economical
2Reliability
If specialized processing techniques are used for thermoelectric materials, then material performance is optimized, but production cost increases
Solution Approach 1:
The patent achieves material performance optimization through parameter changes in composition (doping concentrations, stoichiometry ratios) and processing conditions (sintering temperature, atmosphere, time) using standard ceramic techniques. For example, doping doped SrTiO3 with specific concentrations of dopants like Nb, La, or Ta, and controlling sintering parameters enables tailored electrical and thermal properties without requiring expensive specialized processing equipment
Solution Approach 2:
The patent substitutes expensive specialized thermoelectric materials and processing with inexpensive ceramic materials and conventional ceramic manufacturing. Standard ceramic raw materials, ball milling, pressing, and sintering equipment are used instead of costly boule drawing furnaces, epitaxial reactors, or spark plasma sintering apparatus, significantly reducing production costs while achieving functional thermoelectric performance
3Manufacturing precision
If multi-layer ceramic configuration with doped materials is used, then electrical properties control is improved, but material selection complexity increases
Solution Approach 1:
The patent applies local quality by using different doped ceramic materials for n-type and p-type elements in the thermoelectric couples. Specific dopants are selected for specific material systems (e.g., Nb or La doping for SrTiO3 n-type, Li doping for NiO p-type) to create localized electrical properties tailored to each element's function in the thermoelectric couple, enabling precise control of electrical characteristics through composition gradients and doping profiles
Solution Approach 2:
The patent employs composite doped ceramic materials where ceramic base materials (SrTiO3, NiO, BaZrO3) are combined with dopant oxides or compounds to create composite structures with tailored properties. These composite ceramics provide both the structural stability of ceramics and the electrical functionality of semiconductors, enabling controlled electrical properties while maintaining material processability through conventional ceramic techniques
4Ease of manufacture
If standard ceramic processing techniques are used, then production cost is reduced, but incorporation of desirable features is limited
Solution Approach 1:
The patent overcomes the limitation of standard ceramic processing by applying local quality through spatially varying doping concentrations and composition gradients within the ceramic elements. Doping can be concentrated at grain boundaries, surfaces, or specific regions to create localized functional features such as enhanced electrical conductivity zones, thermal barrier regions, or stress management layers, all achievable through conventional ceramic processing with controlled atmosphere and temperature profiles
Solution Approach 2:
The patent uses composite doped ceramic materials that combine multiple functionalities within a single material system. The ceramic matrix provides structural integrity and thermal stability, while dopant phases provide electrical conductivity, catalytic activity, or other functional properties. This composite approach enables incorporation of multiple desirable features (electrical functionality, thermal management, mechanical strength) using standard ceramic processing techniques
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 simplifies the construction of thermoelectric generators, allows for greater control over electrical properties, and enables the creation of high-temperature devices with improved thermal and electrical conductivity, reducing production costs and enhancing performance.
Implementation Method 1
thermoelectric generator module for converting thermal energy to electrical energy based on temperature differences between portions of the module
Implementation Method 2
converting thermal energy to electrical energy based on temperature differences between portions of the device based on the Peltier/Seebeck effect
Data Source
AI summary
Disclosed are apparatus and methodology for constructing thermoelectric devices (TEDs). N-type elements are paired with P-type elements in an array of pairs between substrates. The paired elements are electrically connected in series by various techniques including brazing for hot side and/or also cold side connections, and soldering for cold side connections while being thermally connected in parallel. In selected embodiments, electrical and mechanical connections of the elements may be made solely by mechanical pressure.