Rolled-up micro asymmetric supercapacitors

Datum

07.05.2018

Zeit

13:00 - 14:00

Sprecher

Fei Li

Zugehörigkeit

IFW Dresden

Sprache

en

Hauptthema

Materialien

Andere Themen

Materialien, Physik

Host

Kristina Krummer-Meier

Beschreibung

The push towards miniaturized electronics calls for the development of micro-scale energy-storage components that can enable sustainable and autonomous operation of electronic devices for applications[1,2]. Micro-supercapacitors have been targeted as a viable route, because they can be charged and discharged much more rapidly and have an almost unlimited lifetime[3]. However, due to their low potential window, micro-supercapacitors store less energy than microbatteries and it is still challenging to realize the above purpose. Considering a win–win situation to reach a common goal of higher energy density and power density, one design of “Micro asymmetric supercapacitors (MASCs)” has been proposed recently. MASCs consist of two dissimilar electrodes, being able to achieve higher working voltage[4,5]. Unfortunately, the development of such kind of device is prevented by the required complex processing of patterned active materials and low areal performance in practical microelectronic circuits[6]. Therefore, it is of vital importance to develop a smart and reliable fabrication method for constructing 3D MASCs with high areal performance and advanced integrability with microelectronics. Rolled-up nanotechnology, a unique method to self-assemble nanomembranes into 3D structures, has already been developed for the tubular battery materials and capacitor devices[7,8]. It opens up the possibility towards the integrated rolled-up MASCs with small footprint area. In this talk, I will demonstrate my route towards integrated rolled-up MASCs with a new material system. PEDOT-MnO2 and Fe2O3 are deposited on interdigital current collectors, acting as cathode and anode, respectively. Strained polymeric layer was utilized to roll the planar MASCs device into the tubular structure within greatly reduced footprint area. The electrochemical performance of each electrode material was optimized in three-electrode system, and then the areal performance of rolled-up MASCs was investigated. The rolled-up MASCs show areal capacitances up to 55 mF cm-2 at a current density of 0.68 mA cm-2. Further exploration and optimization are expected to provide integrated rolled-up MASCs with ultrahigh areal performance. References [1] C. Zhong et al. Chem. Soc. Rev., 2015, 44, 7484-7539. [2] N. A. Kyeremateng et al. Nature Nanotech. , 2017, 12, 7-15. [3] K. Wang et al.Adv. Energy Mater. , 2011, 1, 1068–1072. [4] N. Choudhary et al. Adv. Mater. , 2017, 1605336. [5] M.F. El-Kady et al. Nat. Commun., 2013, 4, 1475. [6] H. Pang et al. Nano Energy, 2015, 15, 303–312 [7] J. Deng, X. Lu, L. Liu, L. Zhang and O. G. Schmidt, Adv. Energy Mater., 2016, 6, 1600797. [8] X. Wang, Y. Chen, O. G. Schmidt and C. Yan, Chem. Soc. Rev. , 2016,45, 1308.

Links

• Seminars at the IFW

Letztmalig verändert: 07.05.2018, 09:56:54