by Staff Writers
Karlsruher, Germany (SPX) Jul 27, 2017
Chlorophyll, blood, and vitamin B12 are all based on the porphyrin molecule. But porphyrin can also be used as an electrode material where it speeds up the charging process of rechargeable batteries. In the "Angewandte Chemie International Edition" journal, researchers from KIT now present the new material system that could mark the beginning of an era of high-performance energy storage and supercapacitors.
Currently, the most widely used battery technology is based on lithium ions. No other rechargeable storage device for electric energy has comparable application properties. Thus, lithium ion batteries are currently indispensable for devices such as laptops, smartphones, or cameras, even though improved properties such as quick-charging would be desirable.
Many materials that improve the properties of lithium ion batteries in the lab, however, are no sustainable options because they are rare, expensive, toxic or harmful to the environment. Ideally, high-performance energy storage materials would be based on renewable resources.
An interdisciplinary research group headed by Professor Maximilian Fichtner of Helmholtz Institute Ulm, founded and organized by KIT, and Professor Mario Ruben from the KIT Institute of Nanotechnology, now presents a new energy storage material that allows a very fast and reversible inclusion of lithium ions.
For this purpose, functional groups were added to the organic copper porphyrin molecule that produce structural and electro-conductive crosslinking of the material when the battery cell is charged for the first time. This significantly stabilizes the structure of the electrode in lab tests and allows several thousands of charge-discharge cycles.
With this material, storage capacities of 130-170 milliamp-hours per gram (mAh/g) were measured in the lab - at a medium voltage of 3 Volt - and charging-discharging times of only one minute. Current experiments suggest that the storage capacity can be increased by another 100 mAh/g and that the storage system can be operated not only with lithium, but also with the much more abundant sodium.
"Porphyrins occur very often in nature and are the basic constituents of chlorophyll, of human and animal blood pigment (hemoglobin), and of vitamin B12," Fichtner explains.
Technical variants of these materials are already in use, e.g. for blue-colored toner in laser printers or for car paint. By bonding functional groups to porphyrin, the scientists succeeded to leverage its specific properties in electrochemical electric storage systems for the first time.
"The storage properties are exceptional because the material has the storage capacity of a battery, but works as fast as a supercapacitor," Fichtner says.
P. Gao, Z. Chen, Zh. Zhao-Karger, J.E. Mueller, Ch. Jung, S. Klyatskaya, T. Diemant, O. Fuhr, T. Jacob, J. Behm, M. Ruben, M. Fichtner, Porphyrin complex as self-conditioned electrode material for high performance energy storage, Angew. Chemie Int. Ed. (2017) doi:10.1002/ange.201702805
College Park MD (SPX) Jul 25, 2017
Engineers at the University of Maryland have invented an entirely new kind of battery. It is bio-compatible because it produces the same kind of ion-based electrical energy used by humans and other living things. In our bodies, flowing ions (sodium, potassium and other electrolytes) are the electrical signals that power the brain and control the rhythm of the heart, the movement of muscles ... read more
Karlsruher Institut fur Technologie
Powering The World in the 21st Century at Energy-Daily.com
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|