Updated on 2024/07/19

写真a

 
MAE, Tomotaro
 
Affiliation
Faculty of Science and Engineering, School of Advanced Science and Engineering
Job title
Assistant Professor(non-tenure-track)
Degree
博士(工学) ( 2024.03 早稲田大学 )

Research Experience

  • 2024.04
    -
    Now

    早稲田大学 理工学術院 講師(任期付き)

Education Background

  • 2021.04
    -
    2024.03

    早稲田大学 先進理工学研究科 応用化学専攻  

  • 2019.04
    -
    2021.03

    早稲田大学 先進理工学研究科 応用化学専攻  

  • 2015.04
    -
    2019.03

    早稲田大学 先進理工学部 応用化学科  

Professional Memberships

  •  
     
     

    フラーレン・ナノチューブ・グラフェン学会

  •  
     
     

    Materials Research Society

  •  
     
     

    化学工学会

Research Areas

  • Chemical reaction and process system engineering / Structural materials and functional materials

Awards

  • 水野賞

    2024.03   早稲田大学   Development and green-house gas emission assessment of Li secondary battery using silicon monoxide-carbon nanotube self-supporting film anode

 

Papers

  • A stable full cell having high energy density realized by using a three-dimensional current collector of carbon nanotubes and partial prelithiation of silicon monoxide

    Tomotaro Mae, Kentaro Kaneko, Hiroki Sakurai, Suguru Noda

    Carbon   218   118663 - 118663  2024.01  [Refereed]

    Authorship:Lead author

     View Summary

    The prelithiation of SiO-based negative electrodes is essential for stable and high-energy-density Li secondary batteries. In this study, a new partial prelithiation method by two-stack electrodes was developed using lightweight and high-capacity carbon-coated silicon monoxide (SiO/C) films held in a sponge-like matrix of carbon nanotubes (CNTs). The charge-discharge cycles of a full cell with the partially prelithiated SiO/C-CNT negative electrode (p-LixSiO/C-CNT with SiO/C content of 85 mass%) and LiNi0.8Mn0.1Co0.1O2 (NCM811)-CNT positive electrode (NCM content of 97 mass%) reduced the irreversible capacity, achieving high energy densities per the total mass of the negative and positive electrodes of 542 and 420 W h kgelectrode−1 at the 1st and 300th cycle, respectively, with high areal capacities of 4.6 and 3.1 mA h cm−2 for the negative and positive electrodes. The flexible CNT sponge matrix expanded/shrunk reversibly during lithiation/delithiation and retained its structure, whereas the thin Li metal formed Li dendrites and dead Li after cycling, as demonstrated by scanning electron microscopy. The partial prelithiation method of simply stacking the pristine SiO/C-CNT film with a fully prelithiated film enables the careful control of the degree of prelithiation, contributing to full cells of various chemistries.

    DOI

    Scopus

  • Stable and high-capacity SiO negative electrode held in reversibly deformable sponge-like matrix of carbon nanotubes

    Tomotaro Mae, Kentaro Kaneko, Mochen Li, Suguru Noda

    Carbon   209   118014 - 118014  2023.06  [Refereed]

    Authorship:Lead author

     View Summary

    A lightweight, high-capacity negative electrode was developed by suspending carbon-coated silicon monoxide (SiO/C) particles in a sponge-like matrix of carbon nanotubes (CNTs) without using metal foils or polymeric binders. High initial delithiation capacities per electrode (SiO/C + CNT) of >1200 mA h gelectrode−1 and >1100 mA h cmelectrode−3 were achieved with an optimum SiO/C content of 85 mass%. The lithiation/delithiation cycle with capacity control at a 45% SiO utilization ratio achieved a high delithiation capacity of 584 mA h gelectrode−1 for 236 cycles. In addition, the flexible and electrically conductive CNT sponge matrix enabled reversible expansion/shrinkage of the entire electrode during lithiation/delithiation, as evidenced by scanning electron microscopy.

    DOI

    Scopus

    3
    Citation
    (Scopus)
  • High-energy-density Li–S battery with positive electrode of lithium polysulfides held by carbon nanotube sponge

    Yuichi Yoshie, Keisuke Hori, Tomotaro Mae, Suguru Noda

    Carbon   182   32 - 41  2021.09  [Refereed]

     View Summary

    Lithium-sulfur battery suffers from the low utilization of sulfur and the high electrolyte/sulfur (E/S) ratio that decrease the cell-based performance. Lithium polysulfides (Li2Sx)-dissolved electrolyte, so called catholyte, enables high utilization of sulfur, but the cell inherently has high E/S ratio due to the limited solubility of Li2Sx. Herein, a composite electrode of Li2Sx (x = 4, 6, 8) and sub-millimeter-long few-wall carbon nanotube (CNT) is proposed. The CNT forms self-supporting sponge-like paper and works as a three-dimensional current collector, in which the Li2Sx is deposited by solution casting and drying. The Li2S6-CNT electrode realizes high specific capacity (1249 mAh gsulfur−1) under a lean electrolyte condition of E/S = 4 μL mgsulfur−1, which is much better than the S8-CNT electrode (233 mAh gsulfur−1). After full charge and conversion of Li2Sx to S, the Li2Sx-CNT electrode maintains its high capacity of 1100 mAh gsulfur−1. The full cell with the Li2S6-CNT and the Li thin foil electrodes realizes 400–500 Wh kgcell−1 for E/S = 4.0 at the 2nd and 3rd discharge and 300 Wh kgcell−1 for E/S = 5.8 at the 97th discharge, based on the total mass of the interior of a cell (electrodes, separator, and electrolyte). Holding solvated Li2Sx by the CNT sponge is the key for the high energy density.

    DOI

    Scopus

    21
    Citation
    (Scopus)

Research Projects

  • カーボンナノチューブ三次元集電体を用いた高エネルギー密度リチウム二次電池の開発

    国立研究開発法人 科学技術振興機構(JST) 

    Project Year :

    2021.10
    -
    2024.03
     

Industrial Property Rights

 

Syllabus

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