Si and Na addition to TI-doped PbTe Thermoelectric Materials

Technology #15706

Questions about this technology? Ask a Technology Manager

Download Printable PDF

Image Gallery
FIG. 4A presents a graph showing temperature dependence of electrical conductivities of embodiment thermoelectric materials of the present disclosure as compared to previously-reported data (dashed lineFIG. 6 presents a graph showing temperature dependence of the dimensionless figure-of-merit (ZT) in embodiment thermoelectric materials of the present disclosure.
Categories
Inventors
Professor Gang Chen
Department of Mechanical Engineering, MIT
External Link (web.mit.edu)
Zhifeng Ren
Boston College
Qinyong Zhang
Boston College
Qian Zhang
Boston College
Managed By
Christopher Noble
MIT Technology Licensing Officer - Clean and Renewable Energy
Patent Protection

Thermoelectric Materials and Methods for Synthesis Thereof

US Patent 9,099,601

Applications

Thermoelectric materials have applications ranging from solid state cooling to conversion of heat to electricity.

Problem Addressed

Thallium doped lead telluride thermoelectric materials fabricated by ball milling and hot pressing have desirable thermoelectric properties, but they have weak mechanical strength. 

Technology

Lead tulleride (PbTe) is one of the most studied intermediate temperature thermoelectric materials, and retains the highest dimensionless thermoelectric figure-of-merit (ZT) for any bulk material. PbTe is synthesized from ball milling and hot pressing, which makes it a simple and scalable manufacturing method. Incorporating Na and Si into the material by adding them into the ball milling plus hot pressing, improves the mechanical strength and allows the material to maintain a high ZT of ~1.7 at 773K. 

Advantages

  • Improves thermoelectric properties
  • Improves mechanical strength