Testing key to solid state polymer development

October 05, 2018 // By Nick Flaherty
A solid state polymer material that has been under test for a decade is now reaching the market. Nick Flaherty talks to the CEO and VP of production at EEStor about how the testing has been key to the development.

EEStor in Cedar Park, Texas, has been developing a ceramic polymer technology based on a Composition Modified Barium Titanate (CMBT) material that can make capacitors and supercapacitors that handle higher voltages in smaller packages.

“We’ve got to fix energy storage globally, it's an imperative and it’s a good opportunity for us,” said Ian Clifford, president and CEO of EEStor. He recognised early on that testing was essential for the credibility of the material, especially for a licensing business. One of the challenges is that the CMBT can be added to a range of other materials with differing performance.

“Early on we started working with Intertek on test who have a lot of experience with capacitor type devices and we are now completing our phase 9 testing with them, expanding it to include two other organisations that specialise in high voltage capacitors to make sure we have a credible, repeatable process for the data,” he said. “We wanted to push the technology as far as we could and get independent certification of the technology and turn heads,” he said. “You kind of only get one chance and we wanted to put our best foot forward, and its very important to be ready. We’ll publish the Phase 9 results in the next couple of weeks with a lot of focus on that.”

“A battery is still out of our reach but in the meantime we have a product that stores more energy than other materials.,” said Bryan Kelly, vice president of production at EEStor. “CMBT mixed with glass can maintain a higher dielectric constant at voltage than other dielectrics. The Phase 7 material showed the nature of the material, a lead free relaxer with low residual polarisation, which is unique and means you get more energy out in discharge.”

Adding the glass changes the thermal response of the capacitor, allows a higher voltage and lowers the sintering temp so instead of precious electrodes capacitor makers


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