Updated on 2026/03/12

写真a

 
SUZUKI KOTA
 
Organization
Institute of Integrated Research Research Center for All-Solid-State Battery Associate Professor
Title
Associate Professor
External link

Degree

  • 博士(理学) ( 2013.3   東京工業大学 )

Research Areas

  • Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

Papers

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MISC

  • Iodine substitution into halogen/Br-site of inverse layered perovskite Li4OBr2 and its Li-ion conduction

    LIU Qiumin, 若崎翔吾, 西久保匠, 重松圭, 山本隆文, 東正樹, 松井直喜, 鈴木耕太, 菅野了次, RANDY Jalem, 館山佳尚

    日本セラミックス協会秋季シンポジウム講演予稿集(Web)   34th   2021

  • High pressure synthesis and Li ionic conductivity of layered anti perovskite Li4O(Br,F)2

    若崎翔吾, 西久保匠, 重松圭, 山本隆文, 東正樹, 松井直喜, 鈴木耕太, 菅野了次, RANDY Jalem, 館山佳尚

    固体イオニクス討論会講演要旨集   46th (CD-ROM)   2020

  • 層状逆ペロブスカイト型Li4OBr2の高圧合成とLiイオン伝導

    若崎翔吾, 西久保匠, 重松圭, 山本隆文, DAS Hena, 東正樹, ZHAO Guowei, 鈴木耕太, 菅野了次, JALEM Randy, 館山佳尚

    粉体粉末冶金協会講演大会(Web)   2020   2020

  • Synthesis and Structural Analysis of a Novel Li-ion Conductor, Li4O(Br,F)2

    若崎翔吾, 重松圭, 山本隆文, DAS Hena, 東正樹, ZHAO Guowei, 鈴木耕太, 菅野了次, JALEM Randy, 館山佳尚

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

  • High Pressure Synthesis and Lithium Ion Conduction of Li4O(Br,F)2 with a Layered Anti-Perovskite Structure

    若崎翔吾, 西久保匠, 重松圭, 山本隆文, DAS Hena, 東正樹, ZHAO Guowei, 鈴木耕太, 菅野了次, JALEM Randy, 館山佳尚

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   33rd   2020

  • 超イオン導電体の開発と全固体リチウム電池への応用 (特集 『全固体二次電池』 に求められる固体電解質の導電率, 耐久性向上)

    Kota Suzuki

    Material stage   16 ( 11 )   9 - 15   2017

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    Language:Japanese  

    CiNii Books

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  • 3. 中性子反射率法を用いたリチウムイオン電池界面の反応解析

    HIRAYAMA, Masaaki, SUZUKI, Kota, KANNO, Ryoji, YONEMURA, Masao

    Electrochemistry   84 ( 7 )   534 - 539   2016

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    Language:English   Publisher:The Electrochemical Society of Japan  

    DOI: 10.5796/electrochemistry.84.534

    CiNii Books

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  • 充放電しているリチウム電池の内部挙動の解析-中性子線を用い非破壊かつリアルタイム観測により実現

    Kota Suzuki

    日本結晶学会誌   58 ( 0 )   s11 - s11   2016

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    Language:Japanese  

    DOI: 10.5940/jcrsj.58.s11

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  • リチウム電池の電極電解質界面の構造研究

    Kota Suzuki

    表面科学   37 ( 2 )   52 - 59   2016

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    Language:Japanese   Publisher:The Surface Science Society of Japan  

    Batteries are a key technology in today's society. Since the "lithium-ion" configuration has been widely accepted, significant efforts have been devoted to attain high energy and power densities to produce an excellent energy storage system without any safety issue. To improve the reliability and power characteristics of batteries, deep insights into the reactions at the electrode/electrolyte interface are necessary. It is rather difficult to detect the reaction at the electrochemical interface using polycrystalline electrode materials, which are used for practical battery systems. The model systems with epitaxial thin-film electrodes might be suitable for understanding these reactions, because the film electrodes provide flat surface, which makes easier to detect the reactions by <i>in situ</i> scattering techniques. The <i>in situ </i>techniques for directly observing surface structural changes of the electrodes have been developed for surface X-ray scattering and neutron reflectivity techniques. These techniques are reviewed and future studies on the interfacial reaction in batteries will be discussed.

    DOI: 10.1380/jsssj.37.52

    CiNii Books

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  • Fabrication and all solid-state battery performance of TiS2/Li10GeP2S12 composite electrodes

    Li, W.J., Hirayama, M., Suzuki, K., Kanno, R.

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   62 ( 11 )   548 - 552   2015.11

  • Synthesis, crystal structure and the ionic conductivity of new Lithium ion conductors, M-doped LiScO2 (M = Zr, Nb, Ta)

    Guowei Zhao, Iqbal Muhammad, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   62 ( 11 )   543 - 547   2015.11

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    Language:Japanese   Publisher:Journal of the Japan Society of Powder and Powder Metallurgy  

    DOI: 10.2497/jjspm.62.543

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  • Highly reversible capacity at the surface of a lithium-rich manganese oxide: a model study using an epitaxial film system

    Taminato, S., Hirayama, M., Suzuki, K., Yamada, N. L., Yonemura, M., Son, J. Y., Kanno, R.

    Chemical Communications   51 ( 9 )   1673 - 1676   2015

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  • TiS2/Li10GeP2S12 複合電極の作製と全固体電池特性

    Kota Suzuki

    粉体および粉末冶金   62 ( 11 )   548 - 552   2015

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    Language:Japanese   Publisher:Japan Society of Powder and Powder Metallurgy  

    TiS<sub>2</sub>/Li<sub>10</sub>GeP<sub>2</sub>S<sub>12</sub> composite electrodes were fabricated using a mill pot rotator, and their electrochemical properties were investigated with all solid-state batteries of TiS<sub>2</sub>/Li<sub>10</sub>GeP<sub>2</sub>S<sub>12</sub>/In-Li. The batteries compressed under 19 MPa showed poor cycle stability and low rate capability due to deterioration of physical contact between the TiS<sub>2</sub> electrode and the Li<sub>10</sub>GeP<sub>2</sub>S<sub>12</sub> solid-electrolyte. The battery performance was much improved by applying a pressure of 230 MPa throughout the electrochemical cycling. The battery delivered the reversible capacity of over 160 mAh g<sup>−1</sup> with high retention under 1 C operation condition.

    DOI: 10.2497/jjspm.62.548

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  • Control of the Phase Fractions in Layered Rock Salt and Spinel-Type Li-(Mn, Co, Ni)-O Epitaxial Thin Films: a Model Blended Cathode System for Lithium Batteries

    ABE, Machiko, SUZUKI, Kota, MINAMISHIMA, Hiroaki, KIM, Kyungsu, TAMINATO, Sou, HIRAYAMA, Masaaki, KANNO, Ryoji

    Journal of the Japan Society of Powder and Powder Metallurgy   62 ( 11 )   531 - 537   2015

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    Language:English   Publisher:Japan Society of Powder and Powder Metallurgy  

    DOI: 10.2497/jjspm.62.531

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  • 新規 LiScO2 系リチウムイオン導電体の合成, 結晶構造解析, イオン導電特性

    Kota Suzuki

    粉体および粉末冶金   62 ( 11 )   543 - 547   2015

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    Language:Japanese   Publisher:Journal of the Japan Society of Powder and Powder Metallurgy  

    DOI: 10.2497/jjspm.62.543

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  • Development of Spectroelectrochemical Cells for in situ Neutron Reflectometry

    Yonemura, M., Hirayama, M., Suzuki, K., Kanno, R., Torikai, N., Yamada, N. L.

    Journal of Physics: Conference Series   502   2014

  • Characterization of Nano-Sized Epitaxial Li4Ti5O12(110) Film Electrode for Lithium Batteries

    Kyungsu Kim, Takeshi Toujigamori, Kota Suzuki, Sou Taminato, Kazuhisa Tamura, Jun'ichiro Mizuki, Masaaki Hirayama, Ryoji Kanno

    ELECTROCHEMISTRY   80 ( 10 )   800 - 803   2012.10

  • X 線・中性子反射率法による LiFePO_4 エピタキシャル薄膜電極界面の直接観察

    Kota Suzuki

    電気化学および工業物理化学: denki kagaku   78 ( 5 )   413 - 415   2010

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  • Surface Characterization of LiFePO4 Epitaxial Thin Films by X-ray/Neutron Reflectometry

    Hirayama, Masaaki, Yonemura, Masao, Suzuki, Kouta, Torikai, Naoya, Smith, Hillary, Watkinsand, Erik, Majewski, Jarek, Kanno, Ryoji

    Electrochemistry   78 ( 5 )   413 - 415   2010

  • 放射光X線によるリチウム電池電極界面のその場観察

    粉生守, 平山雅章, 鈴木耕太, KIM Kyungsu, 田村和久, 内本喜晴, 谷田肇, 宇留賀朋哉, 菅野了次

    化学電池材料研究会ミーティング講演要旨集   12th   2010

  • In situ XAFS法によるリチウム電池電極界面の検出

    平山雅章, CHO Woosuk, 鈴木耕太, KIM Kyungsu, 田村和久, 中尾孝之, 折笠有基, 内本喜晴, 谷田肇, 宇留賀朋哉, 菅野了次

    電池討論会講演要旨集   50th   2009

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Research Projects

  • 多孔質カーボン骨格を利用した全固体リチウム硫黄電池の電極複合体設計

    Grant number:23K04907  2023.4 - 2026.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    鈴木 耕太

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    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

    本研究は、全固体型リチウム硫黄電池の高性能化を達成するため、様々な活物質、固体電解質、合成法を用いて正極および負極複合体の設計および構築を行う。目標は、(i) 固体電解質と電極複合体の作製法の多様性開拓、(ii) リチウム含有正極複合体の作製と高性能化、および(iii) 金属リチウム負極複合体の作製と高性能化、の3点である。
    2023年度は主に、前駆体処理、合成プロセス、熱処理温度などの検討により、(i) 固体電解質合成の多様性開拓と(ii) 正極複合体構築の最適化を進めた。具体的には、アルジロダイト型Li6PS5X (X = Cl, Br)の単相が再現良く得られる、液相合成プロセスを確立した。また、液相プロセスにより5µm以下の均質な粒子が得られることが分かった。Li2S活物質と三次元規則配列したメソ孔を有するカーボンレプリカ(CR)を、4対1の重量比で秤量した。粉体をアルコール溶媒中で混合することで、CR細孔内にLi2Sが導入されたLi2S-CR複合体が得られた。この、Li2S-CR複合体、小粒径のLi6PS5X、および気相法炭素繊維(VGCF)を、50対45対5の重量比で混合して正極複合体とした。この構成を正極複合体の基本として、Li2Sの一部をLiIで置換したLi2S-LiI系活物質へと展開すると、初回放電容量が800 mAh/gを示した。さらに、Li2S-LiIを3対1の比率とした場合、100サイクルに渡り650 mAh/g以上の放電容量を維持することを確認した。
    また、(iii) 金属リチウム負極複合体については、CRとリチウムを1対2.5の重量比で加圧熱処理することで、CR細孔内にリチウムが充填した複合体が得られることを確認した。作製した金属リチウム負極複合体は、全固体リチウム電池の負極として機能し、可逆的な充放電反応が進行することが分かった。

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  • 固体電解質材料合成の多様化と全固体リチウム硫黄電池への応用

    Grant number:20K05683  2020.4 - 2023.3

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    鈴木 耕太

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    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    本研究では,高性能な全固体リチウム硫黄電池実現のため,(I) 固体電解質材料合成の多様化を実現し,(II) 液相法を用いて,三次元規則配列したメソ孔を有するカーボンレプリカ(CR)内へ,硫黄活物質,固体電解質を導入した正極複合体の合成を行った.
    2021年度は前駆体処理,熱処理温度,ガス純度などのプロセス検討により,アルゴン気流下で合成可能なLi10GeP2S12系固体電解質の多様性を開拓した.組成としてLi-M-P-S(M = Ge, Si, Sn, P)を対象とした.M = Ge, Sn, Sn-Siに関してはLi10GeP2S12型構造相が再現よく得られる条件を見いだすことができ,得られた試料のイオン導電率は従来の真空封入法で合成した試料と同程度の値となることを確認した.さらに,M=Si系については,硫黄の一部を酸素やハロゲンで置き換えることで,アルゴン気流下で目的相が得られることを見いだした.一方で,一連のLi-M-P-S系電解質の液相合成については,最適な溶媒と焼成条件が見いだせず,正極複合体の合成にはLi2S活物質とLi6PS5Br系電解質の組み合わせを検討した.Li2S, P2S5, LiBrおよびCRをLi2S:CR:電解質の重量比が4:1:5となるように液相中で混合し,焼成することで正極複合体を得た.同様の重量比で機械混合により作成した正極複合体と電池性能を比較すると,液相混合の方が1.5倍程高い放電を示すことが分かった.また,細孔径の異なるCRを試験した結果,より径の大きな(100 nm)CRにおいて比較的高い放電容量(700 mAh/g)を確認した.さらに,ハロゲン化リチウムや炭素材料などの添加効果についても検討を行っており,液相混合による正極複合体の設計における,電池性能決定因子のスクリーニングを順調に進めることができた.

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  • 薄膜合成法による蓄電固体界面モデルの構築

    Grant number:20H05286  2020.4 - 2022.3

    日本学術振興会  科学研究費助成事業 新学術領域研究(研究領域提案型)  新学術領域研究(研究領域提案型)

    鈴木 耕太

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    Grant amount:\6500000 ( Direct Cost: \5000000 、 Indirect Cost:\1500000 )

    本研究では,薄膜合成法により,固体電池内部の界面反応解析に適した蓄電固体界面モデルを作製し,その解析実施に必要な基盤技術を構築した.
    最終年度は,連携研究として,硫化物系固体電解質を採用した薄膜モデル電池の作製と提供を行った.外部機関でエピタキシャル電極/単結晶基板の二層構造を作製し,その表面に1-3 μm厚さの硫化物系固体電解質薄膜をセパレータ-層として堆積させた.作製した薄膜電池は可逆的な充放電反応を示し,任意の電極と硫化物系固体電池からなるモデル界面を提供する連携体制を確立した.また,独自に構築してきた104-Li(Ni,Co,Mn)O2,111-Li4Ti5O12, 001-Li2RuO3, 001-Li2MnO3, 001-TiO2膜と固体電解質膜を組み合わせた,様々なモデル系固体界面に対して,充放電中のその場観察技術を向上させた.放射光X線を用いた表面X線回折による解析では,製膜サイズ規定用のマスク形状,集電体材料の組成や膜厚制御などにより,再現性高く,電気化学特性と界面数nm領域における結晶構造変化の相関解析ができる環境を構築した.また,リチウム濃度変化の検出が可能な中性子反射率法による界面解析では,真空セルの新規設計により,15 x 15 mm2の大面積試料を3サンプル並行して,シームレスに電気化学計測と反射率スペクトルデータを取得できるシステムが完成した.
    獲得した界面構造の解析による,実用固体電池の界面設計指針提言までは至らなかったが,多様なモデル系の構築と連携体制,モデル固体界面のその場観測プラットフォームが完成したことは大きな成果である.継続的な界面構築と解析による,固体電池内部,特に重要な固固界面における現象解明が期待できる.

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  • Development of solid state ionics materials based on nanoscale structures

    Grant number:19H05793  2019.6 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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    Grant amount:\101920000 ( Direct Cost: \78400000 、 Indirect Cost:\23520000 )

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  • Liquid phase synthesis of sulfur-carbon replica-solid electrolyte composite and its electrochemical performance in all-solid-state lithium-sulfur battery system

    Grant number:18K14304  2018.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    Suzuki Kota

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    Liquid-phase synthesis and mixing of Li10GeP2S12 electrolyte were conducted for the fabrication of all-solid-state lithium-sulfur battery cathodes. Also, an increase in the energy density of the cathode was examined. Optimization of the mixing process using the Li10GeP2S12 suspensions realized the high cycle stability of the battery, indicating the superiority of the liquid phase method. Various factors such as solid mass fraction and agitation time affect the precipitation of Li10GeP2S12 from the homogeneous solution, while the obtained materials after sintering showed comparable ionic conductivity to the as-prepared sample. The sulfur-carbon replica composites prepared by the dissolution-diffusion method have a sulfur content of 80 wt%, and the cycle stability can be improved by controlling the particle size of various materials.

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  • Synthesis of hydride ion conducting oxyhydride thin films

    Grant number:17K19171  2017.6 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Exploratory)

    Kanno Ryoji

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    Grant amount:\6500000 ( Direct Cost: \5000000 、 Indirect Cost:\1500000 )

    Hydride ion conducting La2LiHO3 thin films were synthesized on the single crystal substrates by pulsed laser deposition, and their crystallographic orientations were revealed. The La2LiHO3 thin film showed a conductivity, which is two orders of magnitude higher than that of the polycrystalline powders. The anion defects introduced during the synthesis process could contribute to the high electric conduction in the prepared film. The 100 oriented BaTiO3-xHx films as an electrode material were fabricated by the sputtering methods. It is necessary to establish synthesis and/or treatment conditions for the synthesis of high-quality oxyhydride thin films that show pure hydride ion conductivity. On the other hand, synthesis and evaluation for the electrode material of BaTiO3-xHx implied the possibility of the novel devices consisting of hydride ion conducting thin films.

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  • Creation of superionic conductors

    Grant number:17H06145  2017.5 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)  Grant-in-Aid for Scientific Research (S)

    Kanno Ryoji

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    Grant amount:\168350000 ( Direct Cost: \129500000 、 Indirect Cost:\38850000 )

    Several new ionic conductors were created through a systematic search that integrates computational chemistry and materials science. A new material with the highest conductivity was discovered using the Li10GeP2S12 structure (28 mS cm-1). The machine learning method significantly improved the efficiency of material discovery. A foundation for the use of materials informatics was also established. In the hydride system, systematic synthesis of pseudo two- and three-component systems created a novel material with high conductivity (0.05 mS cm-1 at room temperature), indicating the feasibility of room temperature hydride devices. In the systematic synthesis of nano-stacked electrodes, the feasibility of material design by controlling the nano-interface was demonstrated.

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  • Development of hydride ion conduction mechanism and novel energy devices

    Grant number:15K13803  2015.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Kanno Ryoji

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    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

    New material search and hydride ion conduction mechanism analysis were carried out to develop the hydride conduction mechanism and the novel energy devices. The hydride ion conduction in the K2NiF4 type structure, which is the basic structure of the hydride ion conducting oxy-hydrides, proceeds mainly in the perovskite layer and hydride ion conduction in the perovskite layer is relatively faster than that of hydride ion in the rock salt layer. The K2NiF4 type La-Sr-Li-H-O based material was synthesized by sintering in a container sealed in a hydrogen atmosphere. Since larger quantities of samples can be obtained at one, the process was found to be suitable for the device verification has been established.

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  • Structure analysis and design of space charge layer for development of all-solid-state batteries

    Grant number:25248051  2013.10 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    Kanno Ryoji, Kawaji Hitoshi, Tamua Kazuhisa, Imanisi Nobuyuki, Hirayama Masaaki, Suzuki Kota, Sonoyama Noriyuki, Yonemura Masao

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    Grant amount:\44200000 ( Direct Cost: \34000000 、 Indirect Cost:\10200000 )

    Interfacial analysis in the all-solid-state batteries has been carried out to elucidate relation between structure of space charge layer and electrochemical properties. Novel electrode and solid electrolyte materials were discovered using conventional solid-state reaction and unique thin film synthesis methods. High-energy-density- and high-power-type all-solid-state batteries with stacked film configurations were also fabricated.

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  • Development of solid state ionics materials based on nano-structure information

    Grant number:25106009  2013.6 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Kanno Ryoji, Kobayashi Genki, Mori Daisuke

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    Grant amount:\139100000 ( Direct Cost: \107000000 、 Indirect Cost:\32100000 )

    Novel ion conducting materials that can be applied to energy devices were developed. In addition to classical material search, new direction for material exploration using theoretical science and information science was examined. Hydride ion conductors, which are new ionic conduction species, were developed and demonstrated applicability as an electrolyte for all-solid-state energy devices. For the nano interfacial analysis using the quantum beam, the clear relationship between the nanometer-scale electrochemical interfacial structure and the device performance was revealed. The solid electrolytes in which lithium ions and oxide ions diffuse were developed by exploration based on the known crystal structure. Furthermore, a novel material search method for ion conductors with new composition and new structure using the information science was conducted. The problems to solved and possibility of the novel method were proposed.

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  • Novel energy device using hydride ion conductors

    Grant number:25620180  2013.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    KANNO Ryoji, HIRAYAMA Masaaki, KOBAYASHI Genki, SUZUKI Kota

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    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    A feasibility of an energy conversion device using hydride conductors was investigated. K2NiF4 type structured hydride ion conductors showed pure ionic conductive behavior, indicating that the hydride conductor could be used as a solid-electrolyte for the devices. Symmetric cell using Pd electrodes and the solid-electrolyte successfully demonstrated a reaction from H2 to H- ion. This result revealed the possibility of developing an energy conversion hydride device. Further development of the solid hydride conductive materials and appropriate electrode materials could contribute to the establishment of a novel device with hydride redox reactions.

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