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Materials-Metals 2017
Page 17
November 16-17, 2017 Paris, France
13th Annual Conference on
Materials Science, Metal and Manufacturing
Journal of Materials Science and Nanotechnology
Volume 1 Issue 2
Masaru Miyayama, Mater Sci Nanotechnol 2017, 1:2
Flexible all-solid electrochemical capacitors
composed of inorganic nanosheets
Masaru Miyayama
University of Tokyo, Japan
Protonic electrochemical capacitors using oxide electrodes
and aqueous electrolyte is a promising candidate for the
energy storage device with high energy & power densities and
reliable safety. The use of solid electrolytes in place of aqueous
solutions enables to fabricate thin-film type electrochemical
capacitors, and it is expected to apply themfor various portable
devices. “Nanosheets” are plate-like particles with thickness
of only a few nanometers, and are prepared by delamination
of layer-structured compounds. We found that thin films
prepared by restacking of nanosheets have excellent bending
durability. Namely, their conductivities are kept almost
unchanged under bending deformation. Electrochemical
capacitors were assembled with thin-film electrodes of RuO2
and/or Hx(Ni,Co,Mn)O2 and an electrolyte layer of LDH
(layered Mg-Al double hydroxide). These capacitors showed
reversible capacities even under bending with a curvature
radius of 3 mm. Such flexible electrochemical capacitors are
expected to be applied as thin-film energy storage devices
for wearable and miniaturized electronic devices. In the talk,
mechanisms of the bending durability and effects of electrode
configuration are also described.
Figure: Nanosheet process: delamination and restacking
to particles and thin films.
Recent Publications
• M Yano, S Suzuki, M Miyayama and M Ohgaki (2013)
Effects of microstructure on electrode properties of
nanosheet-derived Hx(Ni1/3Co1/3Mn1/3)O2 for
Electrochemical capacitors. Nanomaterials. 3(2):204-
220.
• M Yano, S Suzuki, M Miyayama and M Ohgaki
(2013) Electrochemical properties of layer-structured
Hx(Ni1/3Co1/3Mn1/3)O 2 for electrochemical capacitors
in alkaline aqueous solutions. J. Asian Ceram. Soc.
1(1):71-76.
• K Kamei, S Suzuki and M Miyayama (2014) Electrical
properties of V2O5/carbon composite electrodes in
aqueous solutions. J. Mater. Sci. 49(16):5579-5585.
• W Lee, S Suzuki and M Miyayama (2014) Electrode
properties of defect-introduced graphene sheets for
electrochemical capacitors using aqueous electrolyte.
Electrochim. Acta. 142:240-246.
• H Jang, S Suzuki and M Miyayama (2014) The role of
Cu ions of the self-reassembled MnO2 nanosheets for
rechargeable aqueous batteries. J. European Ceram. Soc.
34(16):4297-4304.
Biography
Masaru Miyayama is a Professor of Department of Applied Chemistry, School
of Engineering, The University of Tokyo. He got his Bachelor’s in Engineering
in 1977 and Master’s in Engineering in 1979 on Inorganic Materials Chemistry,
and Doctor’s degree in 1987 on Functional Ceramic Materials, all from The
University of Tokyo. He started to work as a Research Associate in 1979, and
was promoted to a Full Professor of The University of Tokyo in 2001. His research
interests include ferroelectric, conducting and electrochemical properties of
oxide-based materials, and materials design through nanostructure control and
defect engineering. He is a Fellow of The Ceramic Society of Japan.