J-GLOBAL         Last updated: Jan 17, 2019 at 12:21
Akita University
Graduate School of Engineering Science, Department of Electrical and Electronic Engineering
Job title
Ph.D.(Akita University)
Research funding number


Recent research targets

1. Energy storage devices such as lithium-ion batteries, lithium-ion capacitors and electric double-layer capacitors (supercapacitors).
2. Role of energy storage devices on the power grid stability in the renewable energy introduction.
3. Biomass utilization for energy and environmental applications.

Akita University Kumagai Laboratory Web Site

Research Areas


Academic & Professional Experience

Jan 2018
Professor, Graduate School of Engineering Science, Akita Univeristy
Apr 2012
Part-time lecturer, Graduate School of Systems Science and Technology, Akita Prefectural University
Apr 2011
Dec 2017
Associate professor, Graduate School of Engineering and Resource Science, Engineering Science, Akita University
Apr 2011
Mar 2012
Part-time lecturer, Fuculty of Systems Science and Technology, Akita Prefectural University
Apr 2009
Mar 2011
Associate professor, Faculty of Systems Science and Technology, Akita Prefectural University
Apr 2006
Mar 2009
Assistant professor, Faculty of Systems Science and Technology, Akita Prefectural University
Sep 2002
Mar 2006
Research associate, Fuculty of Systems Science and Technology, Akita Prefectural University
Apr 2000
Aug 2002
Postdoctoral research fellow, Japan Society for the Promotion of Science


Apr 1997
Mar 2000
Depatment of System Engineering, Graduate School of Mining, Doctor's Program, Akita University
Apr 1995
Mar 1997
Department of Electrical and Electronic Engineering, Graduate School of Mining, Master's Program, Akita University
Apr 1991
Mar 1995
Department of Electrical and Electronic Engineering, Mining College, Akita University

Published Papers

Yusuke Abe, Tomoaki Saito, Seiji Kumagai
Batteries   4(4) 71   Dec 2018   [Refereed]
Two prelithiation processes (shallow Li-ion insertion, and thrice-repeated deep Li-ion insertion and extraction) were applied to the hard carbon (HC) negative electrode (NE) used in lithium-ion batteries (LIBs). LIB full-cells were assembled using...
Yusuke Abe, Seiji Kumagai
Journal of Energy Storage   19 96-102   Oct 2018   [Refereed]
The influence of the capacity ratio of the negative to positive electrode (N/P ratio) on the rate and cycling performances of LiFePO4/graphite lithium-ion batteries was investigated using 2032 coin-type full and three-electrode cells. LiFePO4/grap...
Tomoaki Saito, Hiroaki Fujiwara, Yusuke Abe, Seiji Kumagai
International Journal of the Society of Materials Engineering for Resources   23(2) 142-146   Sep 2018   [Refereed]
The composite negative electrode active material of Li-ion batteries (LIBs) was fabricated using phenolic resin (PR) and agricultural waste of rice husk (RH). Because silicates were intrinsically composed in RH, the composite of hard carbon (HC) a...
Takuya Eguchi, Daisuke Tashima, Masumi Fukuma, Seiji Kumagai
IEEJ Transactions on Fundamentals and Materials   138(3) 117-118   Mar 2018   [Refereed]
In this study, activated carbons were made from shochu waste for electrode materials of electric double-layer capacitor (EDLC). This study data indicated that the specific capacitance of the shochu waste-derived activated carbon used in the EDLC w...
Daisuke Tashima, Takuya Eguchi, Takashi Kumamoto, Masumi Fukuma, Seiji Kumagai
International Journal of Engineering Science and Innovative Technology   6(6) 59-68   Nov 2017   [Refereed]
Electric double-layer capacitors (EDLCs) are high speed chargeable/dischargeable devices. However, a lack of inexpensive electrode materials currently impedes the broad commercialization of this technology. In this work, we demonstrate low-cost ac...
Seiji Kumagai, Masaki Hatomi, Daisuke Tashima
Journal of Power Sources   343 303-315   Mar 2017   [Refereed]
1-Ethyl-3-methylimidazolium tetrafluoroborate (EMIm·BF4), neat and diluted with propylene carbonate to 1 mol L−1, have been employed as electrolytes of electrical double-layer capacitors (EDLCs). The effects of microporosity and mesoporosity in ac...
Seiji Kumagai, Daisuke Tashima
Biomass and Bioenergy   83 216-223   Dec 2015   [Refereed]
Activated carbons (ACs) prepared from rice husk (RH), an agricultural byproduct, have mesoporosity that is obtainable from leaching of the mineral component of silica. To verify the suitability of RH-derived ACs for the use of electrode materials ...
Seiji Kumagai, Koji Mukaiyachi, Daisuke Tashima
Journal of Energy Storage   3 10-17   Oct 2015   [Refereed]
Activated carbons (AC) powder was coated onto Al current collectors with different thickness (∼30 and ∼80 μm) for use as electrodes of supercapacitors. The relationship between the electrode thickness and the specific capacitance of the supercapac...
Seiji Kumagai, Tomoya Ishikawa, Naoki Sawa
Journal of Energy Storage   2 1-7   Aug 2015   [Refereed]
The specific capacitance of lithium-ion capacitors (LICs) in which the negative electrodes (NEs) of graphite were pre-lithiated at different levels was evaluated by cyclic charge-discharge tests. Two-electrode LIC cells operating at a working volt...
Daisuke Tashima, Yoshihiro Hamasuna, Daisuke Mishima, Seiji Kumagai, John D.W. Madden
IEEJ Transactions on Electrical and Electronic Engineering   9(4) 343-350   Jul 2014   [Refereed]
Electrochemical double‐layer capacitors (EDLCs) are devices that store enormous amounts of charge electrostatically when a potential is applied between electrodes of very high surface area (typically made of porous carbon) and an electrolyte. Wide...

Awards & Honors

Oct 2018
ICRERA 2018 Best Poster Award
Winner: Takuya Eguchi, Daisuke Tashima, Masumi Fukuma, Seiji Kumagai
Apr 2017
Certificate of Outstanding Contribution in Reviewing, Industrial Crops and Products (Elsevier)
Winner: Seiji Kumagai
Feb 2017
Certificate of Outstanding Contribution in Reviewing, Electrochimica Acta (Elsevier)
Winner: Seiji Kumagai