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TSUJIMOTO ShoutaGraduate School of Engineering / Department of Chemical Science and EngineeringAssistant Professor
Research activity information
■ Award- Mar. 2024 電気化学会, 電気化学会第91回大会 優秀学生講演賞
- Dec. 2023 炭素材料学会, 第50回炭素材料学会年会 学生優秀口頭発表賞
- Dec. 2022 炭素材料学会, 第49回炭素材料学会年会 学生優秀口頭発表賞
- Sep. 2022 炭素材料学会, 第59回炭素材料夏季セミナー ポスター賞
- Nov. 2020 電気化学会関西支部, 関西電気化学奨励賞
- Non-graphitizable (hard) carbons provide high capacity for sodium-ion batteries; however, the origin of their potential-dependent kinetics remains unclear. Here, we examine sodium-ion transfer reactions in hard carbons heat-treated at 1300, 1600, 2000, and 2400 °C (HC-1300 to HC-2400). Structural characterization confirms turbostratic frameworks with decreasing average interlayer spacing ( d 002 ) upon increasing heat-treatment temperature and predominantly closed-pore characteristics. Galvanostatic measurements show that the capacity in the slope region (above 0.1 V vs Na + /Na), assigned to Na storage between graphene layers, decreases systematically with increasing heat-treatment temperature. Interfacial kinetics were then probed by electrochemical impedance spectroscopy at controlled potentials (0.2–0.5 V) and temperatures (293–313 K). The activation energy of charge transfer is lower for low heat-treatment carbons in the slope region (50–55 kJ mol −1 at 0.2 V for HC-1300/HC-1600) than for higher heat-treatment carbons (64−67 kJ mol −1 for HC-2000/HC-2400). Notably, only HC-1300 and HC-1600 exhibit pronounced potential dependence of activation energy, consistent with a host-state effect induced by Na intercalation in the slope region. These results reveal a direct correlation between Na storage in graphene interlayers and the activation energy for interfacial charge transfer, providing a mechanistic basis for designing hard carbons with lower kinetic penalties at practical potentials.The Electrochemical Society, Aug. 2026, Journal of The Electrochemical Society, 173(15) (15), 150519 - 150519, English[Refereed]Scientific journal
- Springer Science and Business Media LLC, Aug. 2026, Journal of Applied Electrochemistry, 56(9) (9), English[Refereed]Scientific journal
- The Electrochemical Society of Japan, May 2026, Electrochemistry, 94(5) (5), 052005 - 052005[Refereed]Scientific journal
- Lead, American Chemical Society (ACS), Nov. 2025, ACS Electrochemistry, 1(12) (12), 2859 - 2865, English[Refereed]Scientific journal
- American Chemical Society (ACS), Sep. 2025, The Journal of Physical Chemistry C, 129(40) (40), 17966 - 17974, English[Refereed]Scientific journal
- The Carbon Society of Japan, Sep. 2025, Carbon Reports, 4(3) (3), 240 - 248, English[Refereed]Scientific journal
- Lead, Apr. 2025, Electrochemistry, 93(4) (4), 047001, English[Refereed]Scientific journal
- Abstract The relentless quest for sustainable and efficient energy storage solutions has propelled sodium‐ion batteries (SIBs) to the forefront of research and development in the realm of rechargeable batteries. This mini review delves into the intricate interfacial kinetics of Na ion transfer within SIBs, with a special focus on the carbon‐based negative electrode/electrolyte interfaces. By synthesizing insights from a myriad of studies encompassing experimental and theoretical analyses, we illuminate the critical role of electrode material properties and interfacial dynamics in dictating the kinetics of Na ion transfer for SIBs. Strategies for optimizing these parameters are scrutinized, revealing pathways to enhance the kinetic behavior of Na ions. Furthermore, emerging materials such as hard carbon, carbon nanospheres, and graphene‐like graphite are evaluated for their potential to surmount existing limitations.Lead, Wiley, Jul. 2024, ChemElectroChem, 11(16) (16), e202400275, English[Refereed][Invited]Scientific journal
- Non-graphitizable carbon allows reversible sodium-ion intercalation and hence enables stable and high-capacity sodium storage, making it a promising material for achieving long-term cycling stability in sodium-ion batteries (SIBs). This study investigated the interfacial reactions between various electrolytes and a non-graphitizable carbon electrode for their use in SIBs. The morphology and particle diameter of the non-graphitizable carbon, HC-2000, remained unchanged after heat treatment, indicating its stability. The X-ray diffraction pattern and Raman spectrum suggested a disordered structure of HC-2000 carbon. The interlayer spacing, Brunauer–Emmett–Teller specific surface area, and density were determined to be 0.37 nm, 5.8 m2 g−1, and 1.36 g cm−3, respectively. Electrochemical impedance spectroscopy analysis showed that the charge transfer resistances differed between the Na salts and other electrolytes. Therefore, the use of a large amount of NaF in the solid electrolyte interphase (SEI) resulted in high charge transfer resistances at the non-graphitizable electrodes. However, there were no apparent differences in the activation energy or reversible capacity. In summary, NaF obstructs the penetration pathway of sodium ions into non-graphitizable carbon, impacting the charge transfer resistance and rate stability of SIBs. Charge–discharge measurements revealed reversible capacities of 260–290 mAh g−1, and the rate performance varied depending on the electrolyte. Therefore, an SEI containing minimal inorganic species, such as NaF, is desirable for efficient sodium-ion insertion into non-graphitizable carbon.Lead, The Electrochemical Society, Sep. 2023, Journal of The Electrochemical Society, 170(9) (9), 090526 - 090526, English[Refereed]Scientific journal
- Lead, The Electrochemical Society, Jul. 2021, Journal of The Electrochemical Society, 168(7) (7), 070508 - 070508, English[Refereed]Scientific journal
- Elsevier BV, May 2021, Electrochimica Acta, 379, 138175 - 138175, English[Refereed]Scientific journal
- 電気化学会第93回大会, Mar. 2026, Japanese酸化剤を用いた簡便な酸素発生触媒活性評価手法の開拓Oral presentation
- 電気化学会第93回大会, Mar. 2026, EnglishLa0.93Ba0.07F2.93 ceramic electrolyte as a separator for durable quasi-solid-state Fluoride-Ion BatteriesOral presentation
- 電気化学会第93回大会, Mar. 2026, Japanese超原子価ハロゲン化合物の水系ナトリウムイオン電池正極特性Oral presentation
- 電気化学会第93回大会, Mar. 2026, Japanese炭素系被覆を行った開孔構造ハードカーボンのリチウムイオン電池負極特性Oral presentation
- 電気化学会第93回大会, Mar. 2026原子層堆積法によるLi及びF成分被覆が黒鉛負極の電気化学挙動に及ぼす影響Oral presentation
- 電気化学会第93回大会, Mar. 2026, Japaneseマグネシウム塩を添加した難燃性電解液中における黒鉛負極の電気化学的挙動Oral presentation
- 電気化学会第93回大会, Mar. 2026, Japanese水系アルミニウムイオン電池用TiS2負極の充放電特性
- 電気化学会第93回大会, Mar. 2026, Japanese表面フッ素ガス処理したペロブスカイト酸化物の空気極触媒活性(2)Oral presentation
- 電気化学会第93回大会, Mar. 2026, Japaneseアルカリ電解液へのレドックスメディエーター添加による修飾剤混合二酸化マンガンのサイクル特性向上Oral presentation
- 第66回電池討論会, Nov. 2025, JapaneseCa2+をアニオンアクセプターに用いたフッ化物シャトル電池用電解液の電気化学特性Oral presentation
- 第52回炭素材料学会年会, Nov. 2025, Japanese黒鉛/LiF混合電極における電気化学特性(2)Oral presentation
- 第52回炭素材料学会年会, Nov. 2025, Japaneseヨウ素を含む有機電解液中における黒鉛正極の電気化学的挙動Oral presentation
- 第66回電池討論会, Nov. 2025, Japaneseアルカリ電解液へのレドックスメディエーター添加が二酸化マンガンの電気化学挙動に与える影響Oral presentation
- 第66回電池討論会, Nov. 2025, Japaneseフッ化物イオン電池用電解液のF-の溶媒和エネルギーとフッ化/脱フッ化電位の関係Oral presentation
- 第66回電池討論会, Nov. 2025超原子価ヨウ素化合物の水系ナトリウムイオン電池正極特性Oral presentation
- 2025年電気化学会秋季大会, Sep. 2025, Japanese原子層堆積法を用いてLiおよびF成分を被覆した黒鉛負極の電気化学特性Oral presentation
- 2025年電気化学会秋季大会, Sep. 2025, Japaneseマグネシウム塩を添加した難燃性電解液中における黒鉛へのリチウムイオン挿入脱離挙動Oral presentation
- 電気化学会第92回大会, Mar. 2025, Englishペリレン骨格を有するカーボン前駆体を用いて表面改質した黒鉛材料の負極特性Oral presentation
- 電気化学会第92回大会, Mar. 2025, EnglishNon-Destructive Estimation of State-of-Health in Lithium-Ion Batteries through Evaluation of Cathode Contact ResistancesOral presentation
- 電気化学会第92回大会, Mar. 2025, Japanese薄膜電極によるLi1-xCoO2のモデル化と酸素発生触媒活性評価Oral presentation
- 電気化学会第92回大会, Mar. 2025, JapaneseNa3V2(PO4)3/β''-Al2O3界面へのアニオン移動を抑制したポリマー中間層の導入Oral presentation
- 電気化学会第92回大会, Mar. 2025, Japanese炭素系被覆を行ったハードカーボンの硫化物系全固体電池負極特性Oral presentation
- 電気化学会第92回大会, Mar. 2025, Japanese表面フッ素ガス処理したペロブスカイト酸化物の空気極触媒活性Oral presentation
- 電気化学会第92回大会, Mar. 2025, Japaneseアルカリ電解液における二酸化マンガン正極に適する添加剤の探索Oral presentation
- 電気化学会第92回大会, Mar. 2025, Japanese黒鉛/LiF混合電極を利用した黒鉛層間化合物の電気化学的合成および高電位正極としての利用Oral presentation
- 電気化学会第92回大会, Mar. 2025, Japanese超原子価ヨウ素化合物の酸化還元を活用した正極材料の電気化学特性Oral presentation
- 第51回炭素材料学会年会, Nov. 2024, Japanese難黒鉛化性炭素の熱処理温度が界面ナトリウムイオン移動反応に与える影響(2)Oral presentation
- 第51回炭素材料学会年会, Nov. 2024, Japanese黒鉛/LiF混合電極における電気化学特性Oral presentation
- 第65回電池討論会, Nov. 2024, Japanese正極/β''-Al2O3界面へのNaイオン伝導性ポリマー中間層の導入Oral presentation
- PRiME2024, Oct. 2024, EnglishEffect of Heat-Treated Temperature of Non-Graphitizable Carbon on Sodium-Ion Transfer ReactionOral presentation
- PRiME2024, Oct. 2024, EnglishEffect of Soft Carbon Coating on Electrochemical Performance of Graphite As Negative Electrode Materials for Lithium-Ion BatteriesOral presentation
- PRiME2024, Oct. 2024, EnglishThin-Film Study of Delithiated LiCoO2 Catalyst for Oxygen Evolution Reaction in Alkaline MediaOral presentation
- 電気化学会第91回大会, Mar. 2024, Japanese熱処理温度の異なる難黒鉛化性炭素へのナトリウムイオン吸蔵脱離挙動解析(2)Oral presentation
- 第141回黒鉛化合物研究会, Jan. 2024, Japanese難黒鉛化性炭素へのアルカリ金属イオン移動反応に関する研究[Invited]Invited oral presentation
- 2023年度第3回関西電気化学研究会, Dec. 2023, Japanese難黒鉛化性炭素負極におけるナトリウムイオン吸蔵脱離反応の速度論的解析[Invited]Invited oral presentation
- 第50回炭素材料学会年会, Nov. 2023, Japanese難黒鉛化性炭素の熱処理温度が界面ナトリウムイオン移動反応に与える影響Oral presentation
- 3rd Nucleation and Growth Research Conference, Nov. 2023, EnglishInvestigation of Sodium-ion Transfer Reaction between Non-Graphitizable Carbon and Various ElectrolytesPoster presentation
- 244th ECS Meeting, Oct. 2023, EnglishEffect of Electrolyte on Sodium-Ion Storage Behavior into Non-Graphitizable Carbon Negative ElectrodeOral presentation
- 2023年電気化学会秋季大会, Sep. 2023, Japanese熱処理温度の異なる難黒鉛化性炭素へのナトリウムイオン吸蔵脱離挙動解析
- 電気化学会第90回大会, Mar. 2023, Japanese難黒鉛化性炭素へのナトリウムイオン吸蔵脱離挙動に電解液が与える影響(2)Oral presentation
- 第49回炭素材料学会年会, Dec. 2022, Japanese難黒鉛化性炭素電極の界面ナトリウムイオン移動抵抗に対する電解液の影響Oral presentation
- 第63回電池討論会, Nov. 2022, Japanese高温で熱処理した難黒鉛化性炭素負極へのナトリウムイオン吸蔵脱離挙動に電解液が与える影響Oral presentation
- 2022年電気化学会秋季大会, Sep. 2022, Japanese難黒鉛化性炭素負極へのナトリウムイオン吸蔵脱離挙動に電解液が与える影響Oral presentation
- 電気化学会第89回大会, Mar. 2022, Japanese難黒鉛化性炭素負極へのナトリウムイオン吸蔵脱離挙動に電極表面被膜が与える影響Oral presentation
- 第48回炭素材料学会, Dec. 2021, Japanese難黒鉛化性炭素負極へのアルカリ金属イオン吸蔵脱離挙動に種々の電解液が与える影響Oral presentation
- 2021年電気化学会秋季大会, Sep. 2021, Japanese難黒鉛化性炭素へのアルカリ金属イオン吸蔵脱離反応の速度論的解析(2)Oral presentation
- 第58回炭素材料夏季セミナー, Aug. 2021, Japanese難黒鉛化性炭素へのアルカリ金属イオン吸蔵脱離挙動解析Oral presentation
- 電気化学会第88回大会, Mar. 2021, Japanese難黒鉛化性炭素負極へのアルカリ金属イオン吸蔵脱離挙動の速度論的解析Oral presentation
- 2020年度第3回関西電気化学研究会Webiner, Nov. 2020, Japanese閉孔構造を有する難黒鉛化性炭素負極のアルカリ金属イオン吸蔵脱離挙動Poster presentation
- 第61回電池討論会, Nov. 2020, Japanese閉孔構造を有する難黒鉛化性炭素電極のアルカリ金属イオン吸蔵脱離挙動Oral presentation
- The Electrochemical SocietyApr. 2026 - Present
- 電池技術委員会May 2024 - Present
- 関西電気化学研究会Apr. 2024 - Present
- 炭素材料学会Feb. 2022 - Present
- 電気化学会May 2021 - Present
