Pan European Networks - Horizon 2020 - page 124

W
ith the combined knowledge of 19 Fraunhofer
institutes, the Fraunhofer Battery Alliance aims,
through relevant research on the topic of
electrochemical energy storage, to develop appropriate technical
and conceptual solutions and transfer them into the application.
At all times, the activities of the Fraunhofer Battery Alliance pay
special attention to social, economic and environmental impacts.
High-performance batteries are key components in mobile and
stationary electrically powered applications and are also the most
complex elements in the system. Particularly in high energy and
output ranges, the durability and reliability of a system must be
high, placing significant technical demands on the batteries. The
alliance is concerned with both primary and secondary
(rechargeable) systems, from small scale applications such as
button cells to large stationary systems such as redox-flow
batteries. Electrical energy storage devices in vehicles must meet
a particularly wide range of (sometimes contradictory)
requirements, regarding for example their cost, energy and power
density, cycle stability, temperature range, and safety.
In order to adapt lithium-ion batteries for use in vehicles,
optimisation is needed in a variety of areas. The institutes of the
Fraunhofer-Gesellschaft have competences in virtually all of these
areas. The Battery Alliance will further develop and expand
research in the field of electrochemical energy storage devices as
a central business area of the Fraunhofer-Gesellschaft. The
competences of the alliance cover materials, systems, simulation
and testing.
Improved cell materials
The Fraunhofer Battery Alliance develops, optimises and
characterises customer-specific materials and manufacturing
processes for batteries. Emphasis is placed on lithium-ion
systems and double-layer capacitors, and also on redox-flow and
high-temperature storage devices (Na-S, Na-NiCl
2
).
Research and development work aims to increase tolerance
towards external influences and improve storage properties and
intrinsic safety, paying attention to aspects of the cell
manufacture. New electrolytes are also developed which improve
the operating safety of lithium-ion batteries and, in parallel, can
act as separators. Inorganic-organic hybrid polymers
(ORMOCER®e) are a key component in this as their cost-efficient
starting materials and ease of functionalisation mean they can
meet the high demands placed on electrolyte/separator systems.
Properties such as stability (thermal, mechanical and
electrochemical), conductivity and flammability can be adjusted
through the incorporation of specific functional groups.
The material development knowhow available at the partner
institutes means that the individual material component’s
electrode(s), electrolyte and separator can be optimally adjusted
to each other in the processing of the electrolytes/separators.
Here we apply our own developments and commercial products,
which can be modified as required. Cutting-edge facilities and
equipment, for example impedance spectroscopy,
cyclovoltammetry and Li-NMR spectroscopy, enable a
comprehensive analysis of the reaction processes occurring in the
cell components. Information relevant to production and
application can be obtained on both a laboratory and pilot scale,
facilitating industrial implementation.
Development of customer-specific prototypes
In the Fraunhofer Battery Alliance, individual cells with a different
technological basis can be developed into battery modules and
complete battery systems for various applications, including
electromobility, stationary energy storage devices and specific
applications, according to our customers’ needs.Work covers the
simulation-based design of the mechanical construction and the
cooling system, joining technologies, safety concepts,
development of battery management systems, the accompanying
algorithms for measuring charge and ageing, and optimised
charging and operating strategies. The interfaces of the modular
battery systems are configured to facilitate system integration in
terms of both performance and communication.
For applications that place particularly high demands on the
electrical properties and/or the design of energy storage devices,
Developing the energy storage systems of tomorrow
Fraunhofer Battery Alliance
124
I S S U E S I X
H O R I Z O N 2 0 2 0 P R O J E C T S : P O R TA L
P R O F I L E
S O C I E TA L C H A L L E N G E S : E N E R G Y
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