3D Micro-Energy Storage Based on Rolled-up and Micro-Fabrication Techniques

Datum

28.06.2019

Zeit

09:00 - 10:00

Sprecher

Jinhui Wang

Zugehörigkeit

IFW Dresden

Sprache

en

Hauptthema

Materialien

Host

Kristina Krummer-Meier

Beschreibung

The rapid development of integrated and miniaturized electronic devices for wireless sensor networks, microelectromechanical systems (MEMS), portable electronics etc., has triggered tremendous research activities on micro-scale energy storage units.1-3 Those units are required to have high energy density and high power density within limited space and footprint area. Moreover, they are expected to be compatible with other micro-devices’ integration and mass production technique.4,5 In this case, to develop smart and reliable fabrication methodologies for 3D electrodes with high loading of active materials, has become an urgent and decisive task in the field of micro-energy storage. Rolled-up nanotechnology, a unique method for self-assembling nanomembranes into 3D structures, has already been developed for the tubular battery materials and capacitor devices.6,7 It opens up the possibility toward the integrated 3D micro-supercapacitors (MSCs) and aqueous micro-batteries (AMBs) with small footprint area. In this seminar, I will introduce my research progress on achieving high performance 3D interdigital energy storage devices, from integrating wafer-scale device arrays to developing nanoscale material systems. 1. Poly(3,4-ethylenedioxythiophene) (PEDOT)-based interdigital electrodes are designed. Through a thermo-responsive electrolyte, the planar MSC can be switched on/off between 30 oC and 80 oC. Furthermore, PEDOT electrodes were deposited and patterned on the strained polymeric layer stack to construct tubular architectures within greatly reduced footprint area (Fig. 1). Such tubular MSC provides efficient self-protection on the MSC against external compression up to about 30 MPa and exhibits an areal capacitance of 82.5 mF cm-2 at 0.3 mA cm-2. An improved cycling stability with a capacitance retention up to 96.6 % over 5000 cycles were demonstrated. 2. Inorganic membranes as strain layers were also employed to construct MSCs. Interdigital MnO2 was deposited on Ni/Cr based magnetic nanomebrane to fabricate ultra-small tubular MSC. 3. An electrochemical method was used to fabricate in-plane 3D interdigital Fe/Ni aqueous MSC. Cu nanowires were used as current collectors to grow Fe2O3 anode and NiCo hydroxide cathode.

Links

• Seminars at the IFW

Letztmalig verändert: 28.06.2019, 00:09:57