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Programlnternational Symposium on Enhanced

E lectrochem ica I Ca pacitors

5-L0 May 2019]dantes, trance I La Cite Nantes Events Center

iseeca p-201-9.sciencesconf.o rg

@iseecap | #iseecap2019

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Multiphase composite electrodes for hybrid supercapacitors operated in ionicliquid electrolytes

L. Soserovl, S. Veleval, A. Stoyanoval, T. Boyadzhieva2, V. Koleva2, R. Stoyanova2

t htstitute of Electrochemistry and Energy Systems - BAS, I 0 G. Bonchev Str., I I I 3, Sofia, Bulgaria2 Institute of General and Inorganic Chemistry - BAS, I I G. Bonchev Str., t I I3, Sofia, Bulgaria

e-mail addres : I stefanov@iees.bas.bg

The hybrid supercapacitors are a new generation systems that combine the advantages of an electrochemicaldoubleJayer capacitor (long cycle life and high power performance) and batteries (high energy density).Despite the increased research interest and intensive work in this area, the achieving a high energy density andpower density using an environmentally friendly materials is an up-to-date task that requires furtherdevelopment.

Opportunity in this direction is the use of ionic liquids which, due to their unique properties as solvents

over a wide temperature range, are becoming more and more popular in modern green technologies, and theintroduction of conductive polymers increase both the electrical conductivity and electrochemical stability ofthe electrolyte, and the maximum voltage to which can be achieved. On the other hand the development ofstructured and multiphase composite electrodes with desired morphology and texture based on metal oxides,hydroxides and phosphates will further increase the capacity ofthe hybrid supercapacitors.

The objective of the present work is to develop an environmental friendly hybrid supercapacitor withcomposite electrode composed of carbon matrix and nickel-manganese oxides/hydroxides and ionic liquids as

electrolytes. The used oxides/hydroxides are synthesized by the precursor method and the individualcomponents and composite materials are characterizedby structural, morphological and spectroscopic analysis.The assembled supercapacitor cells are subjected to electrochemical charge/discharge cycling tests and themechanism of ongoing processes through ex-situ physicochemical analyses is also studied.

The hybrid supercapacitor cells demonstrate improved capacitance performances and are promising forfurther investigations.

Acknowledgements: The financial support of the Bulgarian Academy of Science under project Kp-06-OpR04-S I 14,12.20 I 8 is gratefully acknowledged.

References

I I ] G. Wang, L. Zhang, J . Zhang, < A review of electrode materials for electrochemical sgpercapacitors >, Chemical

Society Reviews, 41 (2012) 7 97

[2] G. Tiruye, D. Mufioz-Torrero, J. Palma, M. Anderson, R. Marcilla, <rAll-solid state supercapacitors operating at 3.5

V by using ionic liquid based polymer electrolytesr Journal of Power Sources 279 (2015) 472