Synthetic batteries forenergy revolution

Synthetic batteries for the energy revolution

5:54 AM, 28th October 2015
Synthetic batteries for the energy revolution
The research team and its new battery (from left to right): Prof. Dr. Ulrich S. Schubert, Tobias Janoschka and Dr. Martin Hager.

JENA, GERMANY: Sun and wind are important sources of renewable energy, but they suffer from natural fluctuations. In stormy weather or bright sunshine electricity produced exceeds demand, whereas clouds or a lull in the wind inevitably cause a power shortage. For continuity in electricity supply and stable power grids, energy storage devices will become essential.

So-called redox-flow batteries are the most promising technology to solve this problem. However, they still have one crucial disadvantage. They require expensive materials and aggressive acids.

A team of researchers at the Friedrich Schiller University Jena (FSU Jena), in the Center for Energy and Environmental Chemistry (CEEC Jena) and the JenaBatteries GmbH (a spin-off of the University Jena), made a decisive step towards a redox-flow battery which is simple to handle, safe and economical at the same time. They developed a system on the basis of organic polymers and a harmless saline solution.

"What's new and innovative about our battery is that it can be produced at much less cost, while nearly reaching the capacity of traditional metal and acid containing systems," said Dr. Martin Hager, researcher at FSU Jena.

 The scientists present their battery technology in the current edition of the renowned scientific journal Nature.

In contrast to conventional batteries, the electrodes of a redox-flow battery are not made of solid materials (e.g., metals or metal salts) but they come in a dissolved form. The electrolyte solutions are stored in two tanks, which form the positive and negative terminal of the battery. With the help of pumps the polymer solutions are transferred to an electrochemical cell, in which the polymers are electrochemically reduced or oxidized, thereby charging or discharging the battery. To prevent the electrolytes from intermixing, the cell is divided into two compartments by a membrane. "In these systems the amount of energy stored as well as the power rating can be individually adjusted. Moreover, hardly any self-discharge occurs," Martin Hager explained.

Traditional redox-flow systems mostly use the heavy metal vanadium, dissolved in sulphuric acid as electrolyte. "This is not only extremely expensive, but the solution is highly corrosive, so that a specific membrane has to be used and the life-span of the battery is limited," Hager points out.

In the redox-flow battery of the Jena scientists on the other hand, novel synthetic materials are used. In their core structure they resemble plexiglas and styrofoam (polystyrene), but functional groups have been added enabling the material to accept or donate electrons. No aggressive acids are necessary anymore, the polymers rather 'swim' in an aqueous solution. "Thus we are able to use a simple and low-cost cellulose membrane and avoid poisonous and expensive materials", Tobias Janoschka, first author of the new study, explained.

"This polymer-based redox-flow battery is ideally suited as energy storage for large wind farms and photovoltaic power stations," said Dr. Ulrich S. Schubert, chair for organic and macromolecular chemistry at the FSU Jena and director of the CEEC Jena.

In first tests the redox-flow battery from Jena could withstand up to 10.000 charging cycles without losing a crucial amount of capacity. The energy density of the system presented in the study is ten watt-hours per litre.

© Friedrich Schiller University Jena News



Your Comments (Up to 2000 characters)
Please respect our community and the integrity of its participants. WOC reserves the right to moderate and approve your comment.

Related News

Pirelli, Rosneft, Synthos advance Nakhodka synthetic rubber project

NAKHODKA, RUSSIA: Pirelli, Rosneft and Synthos signed a memorandum of understanding (MOU) regarding the approval of the results of the feasibility stu ...

Read more
Technip bags Libra’s flexible pipes supply contract in Brazil

PARIS, FRANCE: Technip SA said it was awarded a €100 to €250 million substantial contract from Libra Oil & Gas BV, a consortium led by P ...

Read more
Green Plains acquires ethanol plant in Hopewell

OMAHA, US: Green Plains Inc said it has acquired an ethanol production facility located in Hopewell, US. Operating at full capacity, the facility&rsqu ...

Read more
Air Products to build world-scale steam methane reformer in US

BAYTOWN, TEXAS: Air Products Inc said that it will invest $350-$400 million to build, own and operate a world-scale steam methane reformer (SMR) in Ba ...

Read more
Shin-Etsu invests ¥20 billion to expand silicones business in Japan

TOKYO, JAPAN: Shin-Etsu Chemical Co said it plans to proactively expand its silicones business, one of its main businesses, by implementing facility i ...

Read more
New graphene ink helps to make cheaper printed electronics

CAMBRIDGE, UK:  A low-cost, high-speed method for printing graphene inks using a conventional roll-to-roll printing process, like that used to pr ...

Read more uses cookies to ensure that we give you the best experience on our website. By using this site, you agree to our Privacy Policy and our Terms of Use. X