1. Yushi Fujita, Yuta Ito, Tomonari Takeuchi, Randy Jalem, Naoaki Kuwata, Kazunori Takada, Toyoki Okumura. Effects of Sr ²⁺ Doping on Phase Stability and Lithium-Ion Conductivity in Pyrochlore-type Oxyfluoride Solid Electrolytes. Inorganic Chemistry. 65 [27] 15905-15913. 2026. Open Access
2. Prince Sharma, Gen Hasegawa, Sihao Xing, Naoaki Kuwata. Advancing Solid-State Batteries via Thin-Film Electrolytes Fabricated by Pulsed Laser Deposition. ACS Applied Electronic Materials. 8 [12] 4855-4875. 2026. Open Access
3. Marcela Calpa, Randy Jalem, Taiga Ozawa, Minako Nishioka, Anna Myojin, Gen Hasegawa, Naoaki Kuwata, Shoichi Matsuda, Kei Kubota, Kazunori Takada. Modulating Redox Pathways in Manganese-Based Disordered Rocksalt Cathodes via Molybdenum Incorporation. Chemistry of Materials. 38 [11] 5579-5587. 2026. Open Access
4. Sihao Xing, Gen Hasegawa, Prince Sharma, Daisuke Ito, Kazuhiro Kamiguchi, Kazunori Takada, Naoaki Kuwata. Operando Time-of-Flight Secondary Ion Mass Spectrometry Visualization of Reversible and Irreversible Reactions in Oxide-Based Solid-State Batteries. ACS Energy Letters. 11 [2] 1889-1896. 2026. Open Access
5. Hongbo Yuan, Kaori Sugii, Gen Hasegawa, Yu Meng, Yoshitaka Matsushita, Hirofumi Akamatsu, Naoaki Kuwata, Kazunari Yamaura, Yoshihiro Tsujimoto. Flux Crystal Growth of Ruddlesden–Popper Titanium Oxysulfides Li Ln TiO ₃ S ( Ln = La–Gd): Lithium-Ion Mobility in Li _{1– x} Nd(Ti _{1– x} Nb _x )O ₃ S ( x = 0–0.25). Chemistry of Materials. 38 [3] 1457-1468. 2026. Open Access
6. Naoto Tanibata, Naoki Nonaka, Daisuke Urushihara, Hayami Takeda, Ryo Kobayashi, Naoaki Kuwata, Masanobu Nakayama. High‐Throughput Screening and Characterization of Non‐Flammable Na‐Cl Solid Electrolytes. Advanced Electronic Materials. 12 [4] e00688-1-e00688-9. 2026. Open Access

2025

1. Tewelde Hailay Gebregeorgis, Naoaki Kuwata, Mats Meeusen, Xinhua Zhu, Annick Hubin, Mesfin Haile Mamme. A coupled electro-chemo-mechanical model for all-solid-state batteries and its impact on performance prediction. Electrochimica Acta. 541 147121-147121-17. 2025. Open Access
2. Naoaki Kuwata, Gen Hasegawa, Sihao Xing, Kenjiro Hashi, Yoshitaka Matsushita, Randy Jalem, Kazunori Takada, Hitoshi Onodera, Shuhei Yoshida. Fast lithium-ion diffusion in pyrochlore-type oxyfluoride Li1.25La0.58Nb2O6F. Solid State Ionics. 428 116924-116924-8. 2025. Open Access
3. Marcela Calpa, Kei Kubota, Jittraporn Saengkaew, Shoichi Matsuda, Kazunori Takada. The role of grain boundaries in suppressing particle fracture in Li-rich layered oxide cathode materials. Journal of Power Sources. 634 236473-236473-8. 2025. Open Access
4. Nithya Hellar, Yoshiki Iwai, Masato Ohzu, Sebastian Brox, Arunkumar Dorai, Reiji Takekawa, Naoaki Kuwata, Junichi Kawamura, Martin Winter. Direct observation of Mn-ion dissolution from LiMn2O4 lithium battery cathode to electrolyte. Communications Materials. 6 [1] 1-7. 2025. Open Access
5. Daisuke Ito, Naoaki Kuwata, Seiji Takemoto, Kazuhiro Kamiguchi, Gen Hasegawa, Kazunori Takada. Lattice-matched antiperovskite-perovskite system toward all-solid-state batteries. Nature Communications. 16 [1] 7372-1-7372-12. 2025. Open Access
6. Kei NISHIKAWA, Takuya MASUDA, Yibin XU, Yoshitaka TATEYAMA, Shoichi MATSUDA, Shuji NAKANISHI, Shotaro HANADA, Yoshiharu MUKOUYAMA, Toshihiko MANDAI, Naoaki KUWATA, Tsuyoshi OHNISHI, Kiyoshi KANAMURA. Global Trends in Battery Research and Development: The Contribution of the Center for Advanced Battery Collaboration. Electrochemistry. 93 [6] 062003-062003. 2025. Open Access
7. Prince Sharma, Gen Hasegawa, Sihao Xing, Naoaki Kuwata. Unlocking the potential of battery technologies through time-of-Flight Secondary Ion Mass Spectrometry. Science and Technology of Advanced Materials. 26 [1] 2580917-1-2580917-49. 2025. Open Access
8. Miyuki Shinoda, Koki Matsunoshita, Masanobu Nakayama, Satoshi Hiroi, Koji Ohara, Masaki Abe, Nozomu Ishiguro, Yukio Takahashi, Gen Hasegawa, Naoaki Kuwata, Tsukasa Iwama, Takuya Masuda, Kosuke Suzuki, Hirofumi Ishii, Yu-Cheng Shao, Daisuke Shibata, Akinori Irizawa, Toshiaki Ohta, Itsuki Konuma, Teppei Ohno, Yosuke Ugata, Naoaki Yabuuchi. Activation of Anionic Redox for Stoichiometric and Li-Excess Metal Sulfides through Structural Disordering: Joint Experimental and Theoretical Study. Journal of the American Chemical Society. 147 [30] 26238-26253. 2025. Open Access
9. Yuki Nomura, Kazuo Yamamoto, Naoaki Kuwata, Tsukasa Hirayama. Imaging Phase Boundary Kinetics in Lithium Titanate Using Operando Electron Energy-Loss Spectroscopy. ACS Energy Letters. 10 [3] 1404-1410. 2025. Open Access
10. Shinichi Takeno, Taiki Suematsu, Ryusei Kunisaki, Gen Hasegawa, Ken Watanabe, Naoaki Kuwata, Kazutaka Mitsuishi, Tsuyoshi Ohnishi, Kazunori Takada, Kohichi Suematsu, Kengo Shimanoe. New insight into designing a thick-sintered cathode for Li-ion batteries: the impact of excess lithium in LiCoO₂ on its electrode performance. Journal of Materials Chemistry A. 13 [4] 2943-2949. 2025. Open Access

2024

1. Gen Hasegawa, Youngseok Kim, Yoshinori Tanaka, Naoaki Kuwata, Kunimitsu Kataoka, Takahisa Ohno, Junji Akimoto, Kazunori Takada. Improvement of Lithium-Ion Conductivity by Hf Substitution in Lithium Tantalum Phosphate (LiTa₂PO₈) Solid Electrolyte. ACS Applied Energy Materials. 7 [23] 10897-10905. 2024. Open Access
2. Naoya Masuda, Kiyoshi Kobayashi, Futoshi Utsuno, Naoaki Kuwata. Enhanced capacity of all-solid-state battery comprising LiNbO3-coated Li(Ni0.8Co0.1Mn0.1)O2 Cathode, Li5.4(PS4)(S0.4Cl1.0Br0.6) solid electrolyte and lithium metal anode. Journal of Solid State Electrochemistry. 28 [12] 4409-4417. 2024. Open Access
3. Arunkumar Dorai, Naoaki Kuwata. Understanding Ion Dynamics in Closoborate-Type Lithium-Ion Conductors on Different Time-Scales. The Journal of Physical Chemistry Letters. 15 [18] 4864-4871. 2024. Open Access
4. Takahisa Ohno, Nobuo Tajima, Jun Nara. First-principles investigation on potential profile induced in graphene by surface and edge metal contacts. Japanese Journal of Applied Physics. 63 [5] 051004-051004-6. 2024. Open Access
5. Gen Hasegawa, Naoaki Kuwata, Tsuyoshi Ohnishi, Kazunori Takada. Visualization and evaluation of lithium diffusion at grain boundaries in Li_0.29La_0.57TiO₃ solid electrolytes using secondary ion mass spectrometry. Journal of Materials Chemistry A. 12 [2] 731-738. 2024. Open Access

1. KUWATA, Naoaki, HASEGAWA, Gen. Chapter 24 Pulsed Field Gradient Nuclear Magnetic Resonance Measurement of Lithium Diffusion in Solid Electrolytes. Interface Ionics For All-Solid-State Batteries and Solid State Ionics Devices. 2024. Open Access

1. KUWATA, Naoaki. Lithium Diffusion Coefficients in Solid Electrolytes: Insights from SIMS and NMR. Solid State Ionics 2026 (25th International Conference on Solid State Ionics). 2026. 招待講演
2. KUWATA, Naoaki. Multiscale Lithium-Ion Dynamics in Solid-State Battery Materials. The 23rd International Meeting on Lithium Batteries (IMLB 2026). 2026. 招待講演
3. 桑田 直明. 固体NMRによる固体電解質中のリチウムイオンのマルチスケールダイナミクス解析. 第27回化学電池材料研究会ミーティング. 2026. 招待講演
4. VIANTI Aprilia, HASEGAWA, Gen, KUWATA, Naoaki, TAKADA, Kazunori. Liquid-Phase-Assisted Co-Sintering of LCO/LLZTO Bilayers for Garnet-based Solid-State Batteries. 第91回固体イオ二クス研究会（第27回超イオン導電体物性研究会）. 2026. Open Access
5. 杉井 かおり, 長谷川 源, 笠原 拓真, 片岡 邦光, 野村 優貴, 大野 真之, 桑田 直明. 二次元交換NMRによる酸化物–ハロゲン化物複合電解質中のリチウムイオン運動性の解析. 第91回固体イオニクス研究会. 2026.

2025

1. ケイ シゴウ, HASEGAWA, Gen, SHARMA, Prince, 伊藤 大輔, 上口 憲陽, TAKADA, Kazunori, KUWATA, Naoaki. Visualizing Elements Distribution of Electrodes in All-Solid-State Batteries Using Operando Time-of-Flight Secondary Ion Mass Spectrometry. Materials Research Meeting 2025 (MRM 2025). 2025.
2. Marcela, Calpa, MATSUDA, Shoichi, TAKADA, Kazunori. High-Capacity and Stable Mn-Based Cation-Disordered Rocksalt Oxide Cathodes for All-Solid-State Lithium Batteries. 2nd International Symposium on Solid State Chemistry (ISSSC-2025). 2025.
3. SHARMA, Prince, HASEGAWA, Gen, 伊藤 有, 藤原 良也, KUWATA, Naoaki. Quantifying Lithium Diffusion in Argyrodite Solid Electrolytes via TOF-SIMS Isotope Exchange with Enriched 6Li Thin Film Deposition. 第51回 固体イオニクス討論会. 2025.
4. 長谷川 源, ケイ シゴウ, 伊藤 大輔, 上口 憲陽, シャルマ プリンス, 桑田 直明. 酸化物型固体電池におけるオペランドToF-SIMS計測. 第51回 固体イオニクス討論会. 2025.
5. Marcela, Calpa, KUBOTA, Kei, MATSUDA, Shoichi, TAKADA, Kazunori. Mitigating Particle Fracture in Li-rich Layered Oxide Cathode Materials. The 66th Battery Symposium in Japan. 2025.
6. 桑田 直明, 長谷川 源. PFG-NMRを用いたペロブスカイトおよびパイロクロア型固体電解質のイオンダイナミクス研究. 第66回電池討論会. 2025.
7. SHARMA, Prince, HASEGAWA, Gen, KUWATA, Naoaki. Enhanced Solid-State Battery Performance Using Mn-Doped Li2SnO3 Cathode Prepared via Solid-State Synthesis. MATSUS Fall 2025 (Materials for Sustainable Development Conference). 2025.
8. Yuki Nomura, Kazuo Yamamoto, KUWATA, Naoaki, Tsukasa Hirayama. Real-time imaging of Li-ion diffusion and phase boundary movement in solid-state batteries using operando STEM-EELS. Microscopy & Microanalysis 2025 . 2025.
9. Marcela, Calpa, KUBOTA, Kei, MATSUDA, Shoichi, TAKADA, Kazunori. Polycrystalline Microstructures Enhance Fracture Resistance in Li-rich Layered Oxide Cathodes. 9th Structure Property relationship in Solid State Materials SPSSM 2025. 2025.
10. XIA Yifan, VIANTI Aprilia, KUWATA Naoaki, KUBOTA Kei. Synthesis of Li-B-Al-O solid electrolytes with low melting point and high lithium ionic conductivity. 第26回化学電池材料研究会ミーティング. 2025.
11. 野村優貴, 山本和生, 桑田 直明, 平山司. オペランドSTEM-EELSによるチタン酸リチウム負極内部の相境界ダイナミクスの可視化. 日本顕微鏡学会第81回学術講演会. 2025.
12. 杉井 かおり, 長谷川 源, 桑田 直明, 端 健二郎, 片岡邦光, 秋本 順二, 高田 和典. Li6.5La3Zr1.5Ta0.5O12単結晶の高温における拡散現象. 第８９回固体イオニクス研究会. 2025.
13. 杉井 かおり, 長谷川 源, 桑田 直明, 端 健二郎, 片岡邦光, 秋本 順二, 高田 和典. 高温PFG-NMRによるLi6.5La3Zr1.5Ta0.5O12単結晶の拡散係数測定. 日本物理学会2025年春季大会. 2025.
14. 長谷川 源, マルセル カルパ, 桑田 直明. 電池材料における固体中のイオンダイナミクスの高度解析. SATテクノロジー・ショーケース2025. 2025.
15. 桑田 直明. 全固体電池材料のリチウムイオン拡散：NMRとSIMSでイオンの動きを明らかにする. 化学系学協会北海道支部2025年冬季研究発表会. 2025. 招待講演

2024

1. 桑田 直明. 多結晶LLTO固体電解質のマルチスケール拡散係数測定. 第34回 日本MRS年次大会. 2024. 招待講演
2. 長谷川 源, 秋本 順二, 大野 隆央, 桑田 直明. LiTa2PO8固体電解質におけるHf置換によるリチウムイオン伝導性の向上. 第50回固体イオニクス討論会. 2024.
3. 桑田 直明, 長谷川 源, 端 健二郎, 藤原 靖幸, 射場 英紀. ペロブスカイト型単結晶LLNbOを活用したリチウムイオン拡散の解析. 第65回　電池討論会. 2024.
4. Seongjae Ko, 坂田 大成, 島田 頌, Dorai Arunkumar, 西村 真一, 竹中 規雄, 山田 裕貴, 桑田 直明, 河村 純一, 北田 敦, 山田 淳夫. 液相熱力学に基づく亜鉛金属電池用電解液の設計. 第65回　電池討論会. 2024.
5. 野村 優貴, 桑田 直明. オペランド透過電子顕微鏡法を用いたLTO負極内部のLiイオン拡散の可視化. 第65回　電池討論会. 2024.
6. KUWATA, Naoaki. Lithium Diffusion in Perovskite-Type Solid Electrolytes Revealed by PFG NMR and TOF-SIMS. 15th Annual Symposium of Indian Scientists Association in Japan (ISAJ). 2024. 招待講演
7. Marcela, Calpa, KUBOTA, Kei, MATSUDA, Shoichi, TAKADA, Kazunori. Voltage Hysteresis without Cation Migration in Li-Rich Layered Oxides: A Discrepancy in the Intermediate Crystal Phases. ECS PRiME 2024. 2024. Open Access
8. Marcela, Calpa. Studies on Li2RuO3 as a Li-rich layered oxide cathode material: from atomic to microscale characterization. Hokkaido Summer Institute. 2024. 招待講演
9. MIYOSHI, Shogo, 西原 佳彦, ICHIHARA, Fumihiko, OHNO, Takahisa, MITSUISHI, Kazutaka, KUWATA, Naoaki, MASUDA, Takuya, TAKADA, Kazunori. Effect of Cobalt-substitution on Phase Relation and Sinterability of Lithium-ion Conductor Based on Lithium Titanium Orthophosphate. 24th International Conference on Solid State Ionics (SSI24). 2024.
10. KUWATA, Naoaki, HASEGAWA, Gen. Lithium Diffusion in Perovskite-Type Solid Electrolytes Revealed by PFG-NMR. 24th International Conference on Solid State Ionics. 2024.
11. SHARMA, Prince, HASEGAWA, Gen, KUWATA, Naoaki. Enhanced Lithium Exchange through Indium Layering: Progress in LLZO-Ta Solid Electrolyte Technology. 24th International Conference on Solid State Ionics. 2024.
12. HASEGAWA, Gen, KUWATA, Naoaki. Grain boundary diffusion analysis in solid electrolytes by lithium isotope SIMS imaging. 24th International Conference on Solid State Ionics. 2024.
13. Marcela, Calpa. Liquid-phase synthesis of sulfide solid electrolytes. 4th International Symposium on the Frontiers of Functional Materials Research. 2024. 招待講演
14. 長谷川 源, 秋本 順二, 大野 隆央, 桑田 直明. 新規酸化物型電解質LiTa2PO8におけるHf置換による リチウムイオン伝導性の向上. 第25回超イオン導電体物性研究会（第88回固体イオニクス研究会）. 2024.
15. 桑田 直明, 長谷川 源. ペロブスカイト単結晶 LixLa(1-x)/3NbO3 のイオンダイナミクス. 第25回超イオン導電体物性研究会（第88回固体イオニクス研究会）. 2024.
16. 桑田 直明. PFG-NMRによるペロブスカイト型酸化物固体電解質のリチウム拡散解析. 第121回　新電池構想部会. 2024. 招待講演
17. 長谷川 源, 秋本 順二, 大野 隆央, 桑田 直明. Hf置換によるLiTa2PO8固体電解質のリチウムイオン伝導性の向上. 日本物理学会2024年春季大会. 2024.
18. Marcela, Calpa. Creating efficient Li-ion conducting pathways in composite electrodes for all-solid-state batteries using a liquid-phase process. 48th International Conference and Exposition on Advanced Ceramics and Composites (ICACC 2024). 2024. 招待講演

1. 桑田 直明, 長谷川 源. 固体電解質のバルクと粒界拡散　─NMRとSIMSによる解析─. CERAMICS JAPAN. 59 [10] 671-674. 2024. Open Access
2. 桑田 直明, 長谷川 源. 全固体電池材料における粒界拡散を定量化する新しい手法. 月刊機能材料. 44 [9] 43-48. 2024. Open Access