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Baterai sintetis untuk revolusi energi

Date:

October 21, 2015

Source:

Friedrich-Schiller-Universitaet Jena

Summary:

Sebuah tim peneliti membuat langkah yang menentukan terhadap baterai aliran-redoks  yang sederhana untuk menangani, aman dan ekonomis pada saat yang sama: Mereka mengembangkan sistem atas dasar polimer organik dan larutan garam yang tidak berbahaya. Baterai aliran-redoksbaru dapat menahan hingga 10.000 siklus pengisian tanpa kehilangan sejumlah penting dari kapasitas.

............ Sebuah tim peneliti di Universitas Friedrich Schiller Jena (FSU Jena), di Pusat Energi dan Lingkungan Kimia (CEEC Jena) dan JenaBatteries GmbH (spin a off dari Universitas Jena), membuat langkah yang menentukan terhadap baterai aliran-redoks yang sederhana untuk menangani, aman dan ekonomis pada saat yang sama: Mereka mengembangkan sistem atas dasar polimer organik dan larutan garam yang tidak berbahaya. "Apa yang baru dan inovatif tentang baterai kami adalah bahwa hal itu dapat diproduksi dengan biaya jauh lebih sedikit, sementara hampir mencapai kapasitas logam tradisional dan asam yang mengandung sistem," kata Dr Martin Hager. Para ilmuwan menyajikan teknologi baterai mereka dalam edisi terbaru jurnal ilmiah Nature.....more

Synthetic
batteries for the energy revolution

Chemists present an innovative redox-flow battery based on organic polymers
and water

Date:

October 21, 2015

Source:

Friedrich-Schiller-Universitaet Jena

Summary:

A team of researchers 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. The
new redox-flow battery can withstand up to 10,000 charging cycles without
losing a crucial amount of capacity.

...................

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," Dr. Martin Hager says.
The scientists present their battery technology in the current edition of the
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
explains.

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,
explains. "This polymer-based redox-flow battery is ideally suited as
energy storage for large wind farms and photovoltaic power stations,"
Prof. Dr. Ulrich S. Schubert says. He is chair for Organic and Macromolecular
Chemistry at the FSU Jena and director of the CEEC Jena, a unique energy
research center run in collaboration with the Fraunhofer Institute for Ceramic
Technologies and Systems Hermsdorf/Dresden (IKTS).

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 liter. Yet,
the scientists are already working on larger, more efficient systems. In
addition to the fundamental research at the University, the chemists develop
their system, within the framework of the start-up company JenaBatteries GmbH,
towards marketable products.







Story Source:

The above post is reprinted from materials provided byFriedrich-Schiller-Universitaet
Jena. Note: Materials may be edited for content
and length.







Journal Reference:

1.    Tobias Janoschka, Norbert Martin, Udo Martin, Christian Friebe, Sabine
Morgenstern, Hannes Hiller, Martin D. Hager, Ulrich S. Schubert. An
aqueous, polymer-based redox-flow battery using non-corrosive, safe, and
low-cost materials. Nature, 2015; DOI: 10.1038/nature15746

http://www.sciencedaily.com/releases/2015/10/151021135628.htm










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IN'>http://www.sciencedaily.com/releases/2015/10/151022141716.htm

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