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Volume 7, Issue 2 (Suppl)
J Phys Chem Biophys, an open access journal
ISSN: 2161-0398
Electrochemistry 2017
July 10-11, 2017
Electrochemistry
3
rd
International Conference on
July 10-11, 2017 Berlin, Germany
High voltage aqueous redox flow batteries
Ruiyong Chen
Saarland University, Germany
R
edox flow batteries are promising for large-scale energy storage applications due to their economy and scalability, in comparison
with other energy storage systems. In addition, redox flow batteries have unique character of decoupled energy storage and
power generation capability. Aqueous redox flow battery systems may offer safe operation, low cost and fast ionic mobility (power
generation) in comparison with non-aqueous systems. However, due to the limits in the electrochemical stability window of water,
aqueous systems can generally only be operated with low cell voltage (<1.5 V). Conventional aqueous flow batteries have thus low
energy density (<30 Wh L
-1
), which is far below that for Li-ion batteries. Non-aqueous electrolytes using organic solvents, although
can offer wide electrochemical window, suffer from low ionic conductivity, low solubility for active species and safety concerns. To
access high cell voltage in aqueous systems, Chen et al., have recently developed new aqueous ionic liquid electrolytes with widened
electrochemical window of about 3 V, using a concentrated aqueous solution of 1-butyl-3-methylimidazolium chloride (BMImCl).
Herein, we explore various ionic liquid-based electrolytes and compatible redox couples (soluble species and semi-solid suspension
utilizing solid-state cation/anion intercalation reactions) in the attempt to obtain redox flow batteries with high cell voltage and high
energy density.
Biography
Ruiyong Chen received his PhD degree in 2011 in Physical Chemistry from the Saarland University, Saarbrücken, Germany. He is currently a Habilitation Candidate
at the Saarland University and a Project Leader at the KIST Europe. He has expertise in synthesis and characterization of electrode materials for energy storage
systems and energy-efficient electrolysis. He has developed new two lithium intercalation cathode materials with disordered rock-salt structure for improving
reversible capacity (up to 400 mAh g
-1
) for lithium ion batteries. He is currently developing new high voltage aqueous electrolytes for stationary energy storage
using redox flow batteries.
r.chen@kist-europe.deRuiyong Chen, J Phys Chem Biophys 2017, 7:2(Suppl)
DOI: 10.4172/2161-0398-C1-019