Associate Professor, City University of Hong Kong
Flexible Energy Storage: From Supercapacitor to Aqueous Electrolyte Battery
Our research focuses on development of flexible energy storage/conversion devices, including supercapacitors, batteries and metal air batteries. Here we introduce an extremely safe and wearable solid-state zinc ion battery (ZIB) comprising a novel gelatin and PAM based hierarchical polymer electrolyte (HPE) and an α-MnO2 nanorod/carbon nanotube (CNT) cathode. Benefiting from the well-designed electrolyte and electrodes, the flexible solid-state ZIB delivers a high areal energy density and power density (6.18 mWh cm−2 and 148.2 mW cm−2, respectively), high specific capacity (306 mAh g-1) and excellent cycling stability (97% capacity retention after 1000 cycles at 2772 mA g-1). More importantly, the solid-state ZIB offers high wearability and extreme safety performance over conventional flexible LIBs, and performs very well under various severe conditions, such as being greatly cut, bent, hammered, punctured, sewed, washed in water or even put on fire. In addition, flexible ZIBs were integrated in series to power a commercial smart watch, a wearable pulse senor, and a smart insole, which is the first time that has been achieved to the best of our knowledge.
 Liu and Zhi et al. Towards wearable electronic devices: A quasi-solid-state aqueous lithium-ion battery with outstanding stability, flexibility, safety and breathability, Nano Energy 44, 164 (2018).
 Ma and Zhi et al. Single-Site Active Iron-based Bi-functional Oxygen Catalyst for A Compressible and Rechargeable Zinc-Air Battery, ACS Nano 12, 1949 (2018).
 Pei and Zhi et al. N, S-enriched hierarchically porous carbon as a highly active reversible oxygen electrocatalyst. Energy & Environmental Science 10, 742 (2017).
 Zhu and Zhi et al. A Highly Durable, Transferable, and Substrate‐Versatile High‐Performance All‐Polymer Micro‐Supercapacitor with Plug‐and‐Play Function. Advanced Materials 29, 1605137 (2017).
 Huang and Zhi et al. A polyacrylamide hydrogel electrolyte enabled intrinsically 1000% stretchable and 50% compressible supercapacitor. Angewandte Chemie International Edition DOI: 10.1002/ange.201705212, (2017).
Klaus Hecker is Managing Director of the OE-A (Organic and Printed Electronics Association) at VDMA, the leading international industry association for printed electronics with more 230 members worldwide, representing the entire value chain. He is also responsible for LOPEC – international exhibition and conference for Organic and printed electronics. Klaus joined VDMA in Frankfurt Germany, in 2003 as project manager for the planning of an OLED-pilot-production, where he was responsible for technology evaluation, research planning and public funding. Before his affiliation with VDMA, Klaus Hecker worked at the Institute of Microtechnology Mainz GmbH (IMM), responsible for the flat panel display projects. He received his doctorate degree in solid state physics from the University of Cologne.
The OE-A (Organic and Printed Electronics Association) was founded in December 2004 and is the leading international industry association for organic and printed electronics. It represents the entire value chain of this emerging industry. Our members are world-class global companies and institutions, ranging from Component & Material Suppliers, Equipment & Tool Suppliers, Producers / System Integrators, End-users and R&D Institutes / Universities.
Well over 200 members from Europe, Asia, North America, South America, Africa and Oceania are working together to promote the establishment of a competitive production infrastructure for organic and printed electronics. The vision of the OE-A is to build a bridge between science, technology and application. The OE-A is a working group within VDMA.