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Keynote Lecture

WEB Thermal activation of a ferroelectric based glass-electrolyte battery cell

Wednesday (01.01.2020)
00:00 - 00:30
Part of:


Improved storage of electric power will be required in the coming era of the Internet of Things (IoT), wireless sensor networks that monitor, detect, and gather data will be vital for advancements in human health, public safety, industrial automation, and energy management. Presently, rechargeable batteries are used to power the wireless network. However, the limitations of today's Li-ion batteries make this power source unfeasible, from a cost, environmental perspective and from the need to recharge periodically, for the trillions of sensor nodes predicted to be operating in a few years.

A high priority is to convert wasted heat coming to Earth daily from sunlight and from Industry or combustion engines. Traditional devices converting heat into electrical energy, based their working principles in the Seebeck effect or in pyroelectric properties of piezoelectric materials, needing either a gradient or a temperature rate to work. Here we show an energy storage cell based on a Li- or Na-ferroelectric glass-electrolyte that spontaneously reduces its internal resistance while increasing its dielectric constant from -30 to 75ºC. This cell forms a negative capacitance capacitor at the interface with the negative electrode while discharging with a load.

 

Speaker:
Prof. Maria Helena Braga
The University of Texas at Austin
Additional Authors:
  • Prof. Joana E. Oliveira
    Universidade do Porto