Abstrakti
High-performance and efficient energy storage devices are a necessity for fulfilling the global demand of the growing market of distributed electronics, IoT, mobile electronic devices, electric vehicles, and many more. Supercapacitors and batteries are a priority for energy storage applications. In comparison with batteries, supercapacitors have longer cycle life and higher power density. In some cases, supercapacitors are integrated with batteries to increase electrical performance and efficiency.
The aim of the research in this thesis is to develop and scale the design of a sustainable, low-cost, non-toxic, flexible, reliable, and eco-friendly energy storage device for energy-autonomous and distributed electronics platforms. The use of novel materials and a fabricating process for supercapacitor design were essential to achieve the goal of the research. With the use of low specific area electrode ink, the measured capacitance was 3–4 mF in dual cell supercapacitors. Similarly, a PET/Al laminated metal current collector has advantages due to high conductivity, low ESR, and the use of PC electrolyte (2.5 V/cell) to the target voltage range for low power BLE transmission applications. We also developed a PEDOT: PSS based polymer electrolytic capacitor as an alternative to supercapacitors, which demonstrated a way to print flexible capacitors of a few µF. This capacitor was modeled for low frequency applications such as smoothing and filtering. The second focus of the thesis was to perform a reliability study on the energy storage devices. This helps to observe the performance of the device in different situations, from normal to harsh environments. The supercapacitor’s electrical performance was stable over a wide temperature range from -40 °C to 100 °C. The supercapacitors maintain 100% retention for 10,000 bending cycles and a minimum bending radius of 0.41 cm, showing a high degree of flexibility. The device’s performance declined after thermal shock testing due to defects and cracks in the porous electrode because of rapid prolonged temperature cycling between -40 °C and 100 °C.
The final part of the thesis is to harvest green energy from ambient surroundings using an organic photovoltaic (OPV) module or a piezoelectric transducer. The maximum indoor energy harvested with an OPV module and stored to the supercapacitor was 39 mJ.
On the other hand, with a piezoelectric transducer, the maximum harvested energy was 1.1 mJ and peak power was 11.1 mW. The harvested energy was stored in our printed and flexible storage devices. We also demonstrated that the energy harvested was enough to power an LED driver circuit. Thus, these printed, low-cost, novel, and flexible devices open a door for the field of energy autonomous flexible electronics.
The aim of the research in this thesis is to develop and scale the design of a sustainable, low-cost, non-toxic, flexible, reliable, and eco-friendly energy storage device for energy-autonomous and distributed electronics platforms. The use of novel materials and a fabricating process for supercapacitor design were essential to achieve the goal of the research. With the use of low specific area electrode ink, the measured capacitance was 3–4 mF in dual cell supercapacitors. Similarly, a PET/Al laminated metal current collector has advantages due to high conductivity, low ESR, and the use of PC electrolyte (2.5 V/cell) to the target voltage range for low power BLE transmission applications. We also developed a PEDOT: PSS based polymer electrolytic capacitor as an alternative to supercapacitors, which demonstrated a way to print flexible capacitors of a few µF. This capacitor was modeled for low frequency applications such as smoothing and filtering. The second focus of the thesis was to perform a reliability study on the energy storage devices. This helps to observe the performance of the device in different situations, from normal to harsh environments. The supercapacitor’s electrical performance was stable over a wide temperature range from -40 °C to 100 °C. The supercapacitors maintain 100% retention for 10,000 bending cycles and a minimum bending radius of 0.41 cm, showing a high degree of flexibility. The device’s performance declined after thermal shock testing due to defects and cracks in the porous electrode because of rapid prolonged temperature cycling between -40 °C and 100 °C.
The final part of the thesis is to harvest green energy from ambient surroundings using an organic photovoltaic (OPV) module or a piezoelectric transducer. The maximum indoor energy harvested with an OPV module and stored to the supercapacitor was 39 mJ.
On the other hand, with a piezoelectric transducer, the maximum harvested energy was 1.1 mJ and peak power was 11.1 mW. The harvested energy was stored in our printed and flexible storage devices. We also demonstrated that the energy harvested was enough to power an LED driver circuit. Thus, these printed, low-cost, novel, and flexible devices open a door for the field of energy autonomous flexible electronics.
| Alkuperäiskieli | Englanti |
|---|---|
| Julkaisupaikka | Tampere |
| Kustantaja | Tampere University |
| ISBN (elektroninen) | 978-952-03-2689-0 |
| ISBN (painettu) | 978-952-03-2688-3 |
| Tila | Julkaistu - 2022 |
| OKM-julkaisutyyppi | G5 Artikkeliväitöskirja |
Julkaisusarja
| Nimi | Tampere University Dissertations - Tampereen yliopiston väitöskirjat |
|---|---|
| Vuosikerta | 719 |
| ISSN (painettu) | 2489-9860 |
| ISSN (elektroninen) | 2490-0028 |
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