Next-generation Ultrafast Electric Energy Storage Devices
Research members： Dr. Katsuhiko Naoi, Dr. Etsuro Iwama, Dr. Junichi Miyamoto
Research fields： Materials chemistry
Departments： Department of Applied Chemistry, Institute of Engineering
Keywords： Electric energy stroage (EES) devices, Supercapacitor, nano composites,
Summary
We are especially dedicated for the development of next-generation supercapacitors through the synthesis of the novel electrode materials based on molecular design of nanomaterials and nanocarbons. Nanoscience and nanotechnology can provide tremendous benefits to electrochemical energy storage devices, such as batteries and supercapacitors, by combining new nanoscale properties to realize enhanced energy and power capabilities. Effective strategies to upgrade conventional electric double layer capacitors are investigated and fundamental issues and future directions are identified by our group.
Still, the synthesis of new nano materials is indispensable for the realization of new-generation supercapacitors, while dealing with new nano materials is always accompanied with unexplained phenomena and requires new evaluation standards.
Our group tag-team with top French scientists to organize international GIR capacitor team and tackle these issues by following four approaches;
I)Mechanism: GIR capacitor team will elucidate the mechanism of outstanding electrochemical performances for TUAT’s nano composite materials through accurate structural analyses combining basic X-ray diffraction, powerful X-ray (SPring 8), and high-resolution TEM observation.
II)Evaluation: In current scientific papers, new nano materials are evaluated with a variable method and different measure conditions, which have been complicating the comparison of the nano composites’ performances. GIR capacitor team will endeavor to create standards of the evaluating conditions through the characterization of TUAT’s nano materials with the aids of French researchers.
III)New theory: New characteristics which integrates both of quantum entanglements and nano electrochemical phenomena by the combination of in-situ Raman and FT-IR spectroscopy in TUAT and theoretical calculation such as DFT and Molecular Dynamics in France.
IV)Joint submission for international standard: GIR capacitor team will make clear of the technological path towards next-generation supercapacitor devices starting from developments of new nano materials. Sharing various kinds of new issues associated with nano materials through the collaborating research, we will work on creating the technological international standards.
Reference articles and patents
•直井勝彦, 木須一彰, 沖田尚久, 篠田万里子, 村松将典, 岩間悦郎, 直井和子, "超遠心ナノハイブリッド技術を用いたナノ結晶Li3V1.8Al0.2(PO4)3/多層カーボンナノチューブ複合体のハイブリッドキャパシタ正極特性", Electrochemistry, (2015), 83(4), 249.
•Katsuhiko Naoia, Kazuaki Kisu, Etsuro Iwama, Yuki Sato, Mariko Shinoda, Naohisa Okita and Wako Naoi, "Ultrafast Cathode Characteristics of Nanocrystalline-Li3V2(PO4)3/Carbon Nanofiber Composites", J. Electrochem. Soc., (2015), 162(6), A1.
•Kazuaki Kisu, Etsuro Iwama, Wataru Onishi, Shota Nakashima, Wako Naoi and Katsuhiko Naoi, "Ultrafast nano-spherical single-crystalline LiMn0.792Fe0.198Mg0.010PO4 solid-solution confined among unbundled interstices of SGCNTs", J. Mater. Chem. A, (2014), 2, 20789.
•Kazuaki Kisu, Minami Iijima, Etsuro Iwama, Morihiro Saito,Yuki Orikasa, Wako Naoi and Katsuhiko Naoi, "The origin of anomalous large reversible capacity for SnO2 conversion reaction", J. Mater. Chem. A,(2014), 2, 13058.
•Katsuhiko Naoi, Daisuke Yonekura, Satoshi Moriyama, Hidetomo Goto, Etsuro Iwama, Satoshi Kubota, Shuichi Ishimoto, Wako Naoi, "Lithium-rich Layered Nanoplate/Carbon Composites Exhibiting Extremely Large Reversible Lithium Storrage Capacity", J. Alloys and Compounds, 605,137-141(2014).
•Daisuke Yonekura, Etsuro Iwama, Naoki Ota, Masanori Muramatsu, Morihiro Saito, Yuki Orikasa, Wako Naoi, Katsuhiko Naoi, Progress of Conversion Reaction of Mn3O4 Particles as a function of The Depth of Discharge, Phys.Chem.Chem.Phys.,16,6027-6032(2014).
•Katsuhiko Naoi, Wako Naoi, Shintaro Aoyagi, Junichi Miyamoto, Takeo Kamino, New Generation Nanohybrid Supercapacitor, Accounts of Chemical Research,46(5),1075-1083(2013).
•Katsuhiko Naoi, Shuichi Ishimoto, Junichi Miyamoto, Wako Naoi, Second generation Nanohybrid Supercapacitor: Evolution of capacitive energy storage devices, Energy & Environmental Science, 5,9363-9373(2012).
•Kazumi Chiba, Tsukasa Ueda, Yoji Yamaguchi, Yusuke Oki, Fumitaka Shimodate, Katsuhiko Naoi, Electrolyte Systems for High Withstand Voltage and Durability Part I. Linear Sulfones for Electric Double-Layer Capacitors, J.Electrochem.Soc.,158(8),A872-A882 (2011).
•Kazumi Chiba, Tsukasa Ueda, Yoji Yamaguchi, Yusuke Oki, Fumiya Saiki, Katsuhiko Naoi, Electrolyte Systems for High Withstand Voltage and Durability Part II. Alkylated Cyclic Carbonates for Electric Double-Layer Capacitors, J.Electrochem.Soc., 158(12), A1320-A1327 (2011).
•Katsuhiko Naoi, ‘Nanohybrid Capacitors’: The Next Generation Electrochemical Capacitors, Fuel Cells, 10(5),825-833(2010).
•Katsuhiko Naoi, Shunichi Ishimoto, Yusaku Isobe, Shintaro Aoyagi, High-rate nano-crystalline Li4Ti5O12 attached on carbon nano-fibers fot hybrid supercapacitors, Journal of Power Sources, 195(18), 6250-6254 (2010).
•Katsuhiko Naoi, Etsuro Iwama, Nobuhiro Ogihara, Yasuhiro Nakamura, Haruki Segawa, Yuji Ino, Nonflammable Hydrofluoroether for Lithium-Ion Batteries: Enhanced Rate Capability, Cyclability, and Low-Temperature Performance, J.Electrochem.Soc.,156(4),A272-A276 (2009).
Contact
University Research Administration Center(URAC),
Tokyo University of Agriculture andTechnology
urac[at]ml.tuat.ac.jp
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