Published Thesis 
2012
43) 2012.08　Fabrication of binder-free SnO2 nanoparticle electrode for lithium secondary batteries by electrophoretic deposition method,
      Koichi Ui*, Soshi Kawamura, and Naoaki Kumagai, Electrochim. Acta., 76, 383? 388 (2012).
      DOI: http://dx.doi.org/10.1016/j.electacta.2012.05.048

42) 2012.04　SYNTHESIS AND ELECTROCHEMICAL PROPERTIES OF NANO FIBER HOLLANDITE-TYPE MANGANESE OXIDES USING A HYDROTHERMAL METHOD,
      YOSHIHIRO KADOMA, TATSUYA AKAHIRA, TSUBASA FUKUDA, KOICHI UI, and NAOAKI KUMAGAI, Funct. Mater. Lett., 5(1), 1250004 (5 pages) (2012).

41) 2012.04　Li EXCESS Li4+XTi5-xO12±δ/C COMPOSITE USING SPRAY-DRYING METHOD AND ITS ELECTRODE PROPERTIES,
      DAISUKE YOSHIKAWA, NORIO SUZUKI, YOSHIHIRO KADOMA, KOICHI UI, and NAOAKI KUMAGAI, Funct. Mater. Lett., 5(1), 1250001 (5 pages) (2012).

40) 2012.03　パルス電解法を用いるリチウムイオン二次電池用Ni-Sn合金めっき膜負極の作製,
      宇井幸一*, 瓦井　究, 佐藤吉信, 菊地信栄, 熊谷直昭, 表面技術, 63(3), 188-190 (2012).

2011
39) 2011.04　Preparation of Co-Sn alloy film as negative electrode for lithium secondary batteries by pulse electrodeposition method,
      Koichi Ui*, Shinei Kikuchi, Yasuhiro Jimba, and Naoaki Kumagai, J. Power Sources, 196, 3916-3920 (2011).
      DOI: http://dx.doi.org/10.1016/j.jpowsour.2010.12.002
      Repository: http://hdl.handle.net/10140/4267

38) 2011.04　Influence of the binder types on the electrochemical characteristics of natural graphite electrode in room-temperature ionic liquid,
      Koichi Ui*, Jun Towada, Sho Agatsuma, Naoaki Kumagai, Keigo Yamamoto, Hiroshi Haruyama, Ken Takeuchi, and Nobuyuki Koura, J. Power Sources, 196, 3900-3905 (2011).
      DOI: http://dx.doi.org/10.1016/j.jpowsour.2010.12.007
      Repository: http://hdl.handle.net/10140/4266

2010
37) 2010.08　Spray-Drying Synthesized Lithium-excess Li4+xTi4.95-xNb0.05O12-δ and its Electrochemical Property as Negative Electrode Material for Li-ion Batteries,
      Naoaki Kumagai*, Daisuke Yoshikawa, Yoshihiro Kadoma, and Koichi Ui, Electrochemistry, 78 (9), 754-756 (2010).

36) 2010.08　Synthesis and Electrochemical Properties of LiNi0.5-xMn1.5-xM2xO4 (M ＝Al, Cr) Cathode Materials Prepared by PVA Method,
      Yoshihiro Kadoma, Seiyu Sato, Koichi Ui, and Naoaki Kumagai*, Electrochemistry, 78 (8), 658-661 (2010).

35) 2010.02 Spray-drying Synthesized Lithium-excess Li4+xTi5?xO12?δ and its Electrochemical Property as Negative Electrode Material for Li-ion Batteries,
      Daisuke Yoshikawa, Yoshihiro Kadoma, Jung-Min Kim, Koichi Ui, Naoaki Kumagai, Naoto Kitamura, and Yasushi Idemoto, Electrochim. Acta., 55 (6), 1872-1879 (2010).

34) 2010.01 Optimization of electrochemical properties of LiFePO4/C prepared by an aqueous solution method using sucrose,
      Yoshihiro Kadoma, Jung-Min Kim, Katsutoshi Abiko, Keitaro Ohtsuki, Koichi Ui, and Naoaki Kumagai, Electrochim. Acta., 55 (3), 1034-1041 (2010).

2009
33) 2009.08 Li+ Ion-exchanged Hollandite-type MnO2 in Molten Salt at Several Temperatures and Electrochemical Properties for Lithium Battery Electrodes,
      Yoshihiro Kadoma, Ryo Kimura, Koichi Ui, and Naoaki Kumagai, Electrochemistry, 77 (8), 751-753 (2009).

32) 2009.07 Electrochemical formation of carbon nano-powders with various porosities in molten alkali carbonates,
      K. Le Van, H. Groult, F. Lantelme, M. Dubois, D. Avignant, A. Tressaud, S. Komaba, N. Kumagai, S. Sigrist, Electrochim. Acta., 54 (19), 4566-4573 (2009).

31) 2009.04 Electrochemical Characteristics of Sn Film Prepared by Pulse Electrodeposition Method as Negative Electrode for Lithium Secondary Batteries,
      Koichi Ui, Shinei Kikuchi, Yoshihiro Kadoma, Naoaki Kumagai, and Shigeru Ito, J. Power Sources, 189, 224-229 (2009).
      DOI: http://dx.doi.org/10.1016/j.jpowsour.2008.09.08
      Repository: http://hdl.handle.net/10140/4277

2008
30) 2008.09 Characterization and Electrochemical Properties of Li+ ion-exchanged Products of Hollandite-type Ky(Mn1-xCox)O2 for Rechargeable Lithium Battery Electrodes,
      Yoshihiro Kadoma, Satoru Oshitari, Koichi Ui, and Naoaki Kumagai, Solid State Ionics, 179, 1710-1713 (2008).

29) 2008.09 A Rechargeable Lithium Metal Battery Operating at Intermediate temperatures using Molten Alkali bis(trifluoromethylsulfonyl)amide Mixture as an Electrolyte,
      Atsushi Watarai, Keigo Kubota, Masaki Yamagata, Takuya Goto, Toshiyuki Nohira, Rika Hagiwara, Koichi Ui, and Naoaki Kumagai, J. Power Sources, 183 (2), 724-729 (2008).

28) 2008.08 Alkali carbonate-coated graphite electrode for lithium-ion batteries,
      Shinichi Komaba, Motomi Watanabe, Henri Groult, and Naoaki Kumagai, Carbon, 46 (9), 1184-1193 (2008).

27) 2008.06 Structural Modification of Li[Li0.27Co0.20Mn0.53]O2 by Lithium Extraction and its Electrochemical Property as the Positive Electrode for Li-ion Batteries,
      Property as the Positive Electrode for Li-ion Batteries,
      
26) 2008.05「専門学会誌の分析に基づくリチウム二次電池の研究開発における特質の考察」,
      丹野和夫, 熊谷直昭, 産学連携学会, 4 (2), 34-43 (2008).

25) 2008.02 Doping effects on structure and electrode performance of K-birnessite-type manganese dioxides for rechargeable lithium battery,
      Atsushi Ogata, Shinichi Komaba, Rita Baddour-Hadjean, Jean-Pierre Pereira-Ramos, and Naoaki Kumagai, Electrochim. Acta., 53 (7), 3084-3093 (2008).

24) 2008.01 Synthesis, Structure, and Electrochemical Characteristics of Overlithiated Li1+x(NizCo1-2zMnz)1-xO2 (z = 0.1 - 0.4 and x = 0.0 - 0.1) Positive Electrodes Prepared by Spray-Drying Method,
      Jung-Min Kim, Naoaki Kumagai, and Tae-Hyung Cho, J. Electrochem. Soc., 155 (1), A82-A89 (2008).

2007
23) 2007.12 Synthesis of Hollandite-type LixMnO2 by Li+ ion-exchange in molten salt and lithium insertion characteristics,
      Yoshihiro Kadoma, Satoru Oshitari, Koichi Ui, and Naoaki Kumagai, Electrochim. Acta., 53(4), 1697-1702 (2007).

22) 2007.12 Structural and Electrochemical Properties of Li+ Ion-exchanged Hollandite-type MnO2 for Lithium-ion Batteries,
      Yoshihiro Kadoma, Naoaki Kumagai, Satoru Oshitari, and Koichi Ui, ITE Letters on Batteries, New Technologies & Medicine, 8 (6), 674-678 (2007).

21) 2007.12 Synthesis of Hollandite-type LiyMn1?xCoxO2 (x = 0 - 0.15) by Li+ ion-exchange in Molten Salt and the Electrochemical Property for Rechargeable Lithium Battery Electrodes,
      Naoaki Kumagai, Satoru Oshitari, Shinichi Komaba, and Yoshihiro Kadoma, J. Power Sources, 174 (2), 932-937 (2007).

20) 2007.12 Charge-discharge Characteristics of All-solid-state Thin-filmed Lithium-ion Batteries using Amorphous Nb2O5 Negative Electrodes,
      Hiromi Nakazawa, Kimihiro Sano, Takashi Abe, Mamoru Baba, and Naoaki Kumagai, J. Power Sources, 174 (2), 838-842 (2007).

19) 2007.12 Synthesis and electrochemical properties of lithium non-stoichiometric Li1+x(Ni1/3Co1/3Mn1/3)O2+δ prepared by a spray drying method,
      Jung-Min Kim, Naoaki Kumagai, Yoshihiro Kadoma, and Hitoshi Yashiro, J. Power Sources, 174 (2), 473-479 (2007).

18) 2007.11 Improvement of Electrochemical Characteristics of Natural Graphite Negative Electrode Coated with Polyacrylic Acid in Pure Propylene Carbonate Electrolyte,
      Koichi Ui, Shinei Kikuchi, Fuminobu Mikami, Yoshihiro Kadoma, and Naoaki Kumagai, J. Power Sources, 173 (1), 518-521 (2007).
      DOI: http://dx.doi.org/10.1016/j.jpowsour.2007.04.078
      Repository: http://hdl.handle.net/10140/2043

17) 2007.10 Electrochemical Properties of Li1+x(Ni0.4Co0.2Mn0.4)1-xO2 (x = 0.00 and 0.05) for Lithium-ion Batteries,
      Jung-Min Kim, Yoshihiro Kadoma, Koichi Ui, and Naoaki Kumagai, ITE Letters on Batteries, New Technologies & Medicine, 8 (5), 530-534 (2007).

16) 2007.02 Electrochemistry of Graphite in Li and Na Salt Codissolving Electrolyte for Rechargeable Batteries,
      Shinichi Komaba, Tatsuya Itabashi, Motomi Watanabe, Henri Groult, and Naoaki Kumagai, J. Electrochem. Soc., 154 (4), A322-A330 (2007).

15) 2007.02 Functionality of Oxide Coating for Li[Li0.05Ni0.4Co0.15Mn0.4]O2 as Positive Electrode Materials for Lithium-Ion Secondary Batteries,
      Seung-Taek Myung, Kentarou Izumi, Shinichi Komaba, Hitoshi Yashiro, Hyun Joo Bang, Yang-Kook Sun, and Naoaki Kumagai, J. Phys. Chem. C, 111 (10), 4061-4067 (2007).

14) 2007.01 Electrochemical Properties of Li(Li(1-x)/3Co1/3Mn(2-2x)/3)O2 (0 ? x ? 1) Solid Solutions prepared by Poly-viniyl Alcohol (PVA) Method,
      Jung-Min Kim, Syo Tsuruta, and Naoaki Kumagai, Electrochem. Commun., 9 (1), 103-108 (2007).

2006
13) 2006.12 Improved Electrochemical Properties of Li1+x(Ni0.3Co0.4Mn0.3)O2?δ (x = 0, 0.03 and 0.06) with Lithium Excess Composition Prepared by a Spray Drying Method,
      Jung-Min Kim, Naoaki Kumagai, and Shinichi Komaba, Electrochim. Acta., 52 (4), 1483-1490 (2006).

12) 2006.11 Improved Electrochemical Properties and Structural Stability of Overlithiated Li1+x(Ni1/3Co1/3Mn1/3)1?xO2 Prepared by Spray-Drying Method,
      Jung-Min Kim, Naoaki Kumagai, and Hoon-Taek Chung, Electrochem. Solid-State Lett., 9 (11), A494-A498 (2006).

11) 2006.11 Characterization and Lithium Insertion Characteristics of Hollandite type Ky(Mn1?xMx)O2  for Rechargeable Lithium Battery Electrodes,
      Naoaki Kumagai, Teruhito Sasaki, Satoru Oshitari, and Shinichi Komaba, J. New Mat. Electrochem. Systems, 9, 175-180 (2006).

10) 2006.10 Cathode Performance of Lithium Non-stoichiometric Li[Lix(Ni1/3Co1/3Mn1/3)1-x]O2 Material for Li-ion Batteries
      Jung-Min Kim, Naoaki Kumagai, Yoshihiro Kadoma, Koichi Ui, and Hitoshi Yashiro, ITE Letters on Batteries, New Technologies & Medicine, 7(5), 454-457 (2006).

9) 2006.10 Alkali Salt Coated Graphite Electrode for Lithium-Ion Batteries
      Shinihi Komaba, Motomi Watanabe, Henri Groult, and Naoaki Kumagai, ITE Letters on Batteries, New Technologies & Medicine, 7(5), 439-442 (2006).

8) 2006.08 Improvement of Cycling Performance of Li1.1Mn1.9O4 at 60°C by NiO Addition for Li-ion Secondary Batteries,
      Seung-Taek Myung, Kiyoharu Hosoya, Shinichi Komaba, Hitoshi Yashiro, Yang-Kook Sun, and Naoaki Kumagai, Electrochim. Acta., 51 (26), 5912-5919 (2006).

7) 2006.03 Preparation of Carbon Nanoparticles from Electrolysis of Molten Carbonates and Use as Anode Materials in Lithium-ion Batteries,
      H. Groult, B. Kaplan, F. Lantelme, S. Komaba, N. Kumagai, H. Yashiro, T. Nakajima, B. Simon , and A. Barhoun, Solid State Ionics, 177 (9-10), 869-875 (2006).

6) 2006.03 Hydrothermal Phase Formation of Orthorhombic LiMnO2 and its Derivatives as Lithium Intercalation Compounds,
      Seung-Taek Myung, Shinichi Komaba, Koutaro Kurihara, and Naoaki Kumagai, Solid State Ionics, 177 (7-8), 733-739 (2006).

5) 2006.02 Synthesis of Li[(Ni0.5Mn0.5)1-xLix]O2 by Emulsion Drying Method and Impact of Excess Li on Structural and Electrochemical Properties,
      Seung-Taek Myung, Shinichi Komaba, Koutarou Kurihara, Kiyoharu Hosoya, Naoaki Kumagai, Yang-Kook Sun, Izumi Nakai, Masao Yonemura, and Takashi Kamiyama, Chem. Mater., 18 (6), 1658-1666 (2006).

4) 2006.02 Electrochemical and In Situ XAFS-XRD Investigation of Nb2O5 for Rechargeable Lithium Batteries,
      Ryoji Kodama, Yasuko Terada, Izumi Nakai, Shinichi Komaba, and Naoaki Kumagai, J. Electrochem. Soc., 153 (3), A583-A588 (2006).

3) 2006.01 Impact of Sodium Salt Coating on a Graphite Negative Electrode for Lithium-Ion Batteries,
      Shinichi Komaba, Motomi Watanabe, Henri Groult, Naoaki Kumagai, and Kenji Okahara, Electrochem. Solid-State Lett., 9 (3), A130-A133 (2006).

2) 2006.01 Improvement of Electrochemical Capability of Sputtered Silicon Film Anode for Rechargeable Lithium Batteries,
      Shinichi Komaba, Fuminobu Mikami, Tatsuya Itabashi, Mamoru Baba, Taku Ueno, and Naoaki Kumagai, Bull. Chem. Soc. Jpn., 79 (1), 154-162 (2006).

1) 2006.01 Calcination Synthesis of Birnessite-Type Manganese Dioxide Doped with Cobalt for Rechargeable Li Batteries,
      Atsushi Ogata, Shinichi Komaba, and Naoaki Kumagai, Electrochemistry, 74 (1), 28-32 (2006).
Review 
2010
9) 2010.01 Impact of Ecess Li on the Structural and Electrochemical Properties of Li1+x(NizCo1-2zMnz)1-xO2 Materials for Lithium-Ion Batteries,
      Naoaki Kumagai, Jung-Min Kim, and Yoshihiro Kadoma, Electrochemistry, 78 (1), 23 - 29 (2010).

2009
8) 2009.08 低温溶融塩・室温イオン液体を用いるAlおよびAl合金電析,
      上田幹人, 宇井幸一, 表面技術, 60 (8), 491-496 (2009).

7) 2009.08 バインダーとしてポリアクリル酸を用いたリチウムイオン二次電池用黒鉛負極の特性改善,
      宇井幸一, 富士井大輔, 熊谷直昭, 機能材料, 54(6), 70-74 (2009).

6) 2009.06 ポリアクリル酸を用いたリチウムイオン二次電池用黒鉛負極の開発,
      宇井幸一, 富士井大輔, 熊谷直昭, ケミカルエンジニヤリング, 54(6), 445-449 (2009).

2008
5) 2008.12 室温イオン液体を用いるリチウム二次電池の開発,
      宇井幸一, ケミカルエンジニヤリング, 53(12), 903-909 (2008)

4) 2008.01 泳動電着法を用いる炭素材料膜の作製と応用,
      宇井幸一, 小浦延幸, 粉体および粉末冶金, 55(1), 35-43 (2008).

2006
3) 2006.12 常温型溶融塩(室温イオン液体)を電解液に用いる二次電池の開発,
      小浦延幸, 宇井幸一, FBテクニカルニュース, 62, 1-9 (2006).

2) 2006.06 溶融炭酸塩の融体構造と溶融塩浴中での金属腐食,
      竹内　謙, 宇井幸一, 小浦延幸, 溶融塩および高温化学, 49(2), 87-92 (2006).

1) 2006.04 インピーダンス法（１）,
      雨宮　隆, 宇井幸一, 竹内　謙, Electrochemistry, 74(4), 351-357 (2006)