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2022 Fiscal Year Research-status Report

Topological Defect Engineering on Carbon Electrode for Advanced Batteries

Research Project

Project/Area Number 22K14757
Research InstitutionTohoku University

Principal Investigator

YU WEI  東北大学, 材料科学高等研究所, 特任助教 (10900904)

Project Period (FY) 2022-04-01 – 2024-03-31
KeywordsTopological Defect / Carbon Material / Lithium-Oxygen Battery
Outline of Annual Research Achievements

Content: Topological-defect-rich and edge-site-free graphene mesosponge (GMS) was successfully synthesized by chemical vapor deposition. The properties of GMS were characterized by X-ray diffraction, nitrogen adsorption-desorption, Raman spectroscopy, and temperature-programmed desorption. Lithium-oxygen battery performance was evaluated using cyclic voltammetry and discharge-charge tests. The discharge-charge mechanism was investigated by quantitative and qualitative methods. Importance: for the first time, we confirmed the abundant existence of topological defects on GMS through comprehensive characterizations. Moreover, the catalytic effect of topological defects in Li-O2 batteries was estimated without the influence of edge sites, which was not achieved in previous reports.

Current Status of Research Progress
Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

In previous plan, I need to focus on the synthesis of the carbon material and the textural characterizations in the first year. So far, the synthesis of GMS has already been completed. By carefully selecting the fabrication conditions, a better understanding of how the synthesis conditions affect the final structure of the carbon materials is achieved. The electrochemical performance provides a clear direction for the selection of good carbon materials for Li-O2 batteries. I also completed part of the second year plan. The battery based on GMS cathode was assembled and the performance was compared with commercial carbon references. Also, construction of an in situ DEMS system to study the reaction mechanism was completed. Preliminary tests confirmed the stability of the system.

Strategy for Future Research Activity

In the following work, I will perform comprehensive characterizations on Li-O2 batteries based on GMS cathodes, including the study of electrochemical cycle stability and reaction mechanism. Free-standing GMS-sheet without organic/inorganic binders will be synthesized for practical Li-O2 batteries with high energy density and long cycle stability. The development of advanced isotope DEMS technique to distinguish the side reaction of cathode and electrolyte is the key to deepen the understanding of the reaction mechanism. I plan to publish several papers presenting our results on rational design of carbon cathodes for advanced batteries.

Causes of Carryover

I concelled the trip to London for Carnon2022 last July. The planned flight fee to London will be used next fiscal year for the trip to Cancun, Mexico for the Carbon2023.

  • Research Products

    (7 results)

All 2023 2022

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results) Patent(Industrial Property Rights) (2 results) (of which Overseas: 2 results)

  • [Journal Article] Sequential Catalysis of Defected-Carbon and Solid Catalyst in Li?O<sub>2</sub> Batteries2023

    • Author(s)
      Shen Zhaohan、Yu Wei、Aziz Alex、Chida Koki、Yoshii Takeharu、Nishihara Hirotomo
    • Journal Title

      The Journal of Physical Chemistry C

      Volume: 127 Pages: 6239~6247

    • DOI

      10.1021/acs.jpcc.3c01042

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Edge‐Site‐Free and Topological‐Defect‐Rich Carbon Cathode for High‐Performance Lithium‐Oxygen Batteries2023

    • Author(s)
      Yu Wei、Yoshii Takeharu、Aziz Alex、Tang Rui、Pan Zheng‐Ze、Inoue Kazutoshi、Kotani Motoko、Tanaka Hideki、Scholtzov? Eva、Tunega Daniel、Nishina Yuta、Nishioka Kiho、Nakanishi Shuji、Zhou Yi、Terasaki Osamu、Nishihara Hirotomo
    • Journal Title

      Advanced Science

      Volume: - Pages: 2300268

    • DOI

      10.1002/advs.202300268

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] GO/mesoporous Carbon Composite Membrane for Durable Cathode of Li-O2 Batteries2022

    • Author(s)
      Wei Yu, Takeharu Yoshii, Rui Tang, Zheng-Ze Pan, Hirotomo Nishihara
    • Organizer
      第17回 酸化グラフェン学会
  • [Presentation] Influence of Carbon Cathode Edge Sites on Li-O2 Batteries2022

    • Author(s)
      Wei Yu, Takeharu Yoshii, Rui Tang, Zheng-Ze Pan, Hirotomo Nishihara
    • Organizer
      The 2022 World Conference on Carbon
    • Int'l Joint Research
  • [Presentation] In Pursuit of High-Performance Carbon Cathodes for Li-O2 Batteries2022

    • Author(s)
      Wei Yu, Takeharu Yoshii, Alex Aziz, Rui Tang, Zheng-Ze Pan, Hirotomo Nishihara
    • Organizer
      第49回炭素材料学会年会
  • [Patent(Industrial Property Rights)] リチウム空気電池および多孔質炭素膜の製造方法2022

    • Inventor(s)
      西原洋知、YU WEI
    • Industrial Property Rights Holder
      西原洋知、YU WEI
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      PCT/JP2022/44070
    • Overseas
  • [Patent(Industrial Property Rights)] リチウム空気電池用正極およびリチウム空気電池2022

    • Inventor(s)
      西原洋知、YU WEI
    • Industrial Property Rights Holder
      西原洋知、YU WEI
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      PCT/JP2022/026972
    • Overseas

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Published: 2023-12-25  

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