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Exploration of Ultra-High Voltage Cathodes for Rechargeable Batteries

Research Project

Project/Area Number 20F20038
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Review Section Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
Research InstitutionThe University of Tokyo

Principal Investigator

山田 淳夫  東京大学, 大学院工学系研究科(工学部), 教授 (30359690)

Co-Investigator(Kenkyū-buntansha) DWIBEDI DEBASMITA  東京大学, 工学(系)研究科(研究院), 外国人特別研究員
Project Period (FY) 2020-04-24 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2021: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsBattery / Cathode / High-Voltage / Capacity / Polyanion / Insertion host
Outline of Research at the Start

The aim of the research is to push the current voltage limit of cathodes such that the resulting higher energy density of lithium and/or sodium ion batteries could conveniently meet the current energy demands. In this pursuit, we would perform various optimised synthesis technique to gauge new high voltage electrode systems. Further, we aim to carry a detailed synthesis-structure-property correlation in these cathodes to broaden fundamental understanding on solid-state interfacial chemistry and provide scope for improvising energy/power density and cycling stability of these materials.

Outline of Annual Research Achievements

The research in 2021 fy focussed on exploring high voltage electro-active materials with increased operating voltages and capacities. One direction of research dwelled on study of mixed polyanionic system (VO)2SO4PO4 for their lithium insertion performances. We expected the incorporation of oxy, sulphate and phosphate anions to render stable framework for alkali ion (Li/Na) insertion with a superior cycling performance. Indeed, we could achieve decent electrochemical performance. However, the structural solutions of the proposed system revealed it to be mixture of phases and could not account for its electrochemical performance, thus making the research ambiguous at this point. Another direction focussed on phase transformations in Na-Fe-S-O quaternary sulphate systems. Here we studied intimate relationship between various Na-Fe-S-O and their hydrated phase with reaction temperature. Also, we studied extensively a metastable phase Na2Fe2(SO4)2 system for its stability, sensitivity, and decent electrochemical activities. This proposed work is near completion, and I am complying all these results for journal publication.

Research Progress Status

令和3年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和3年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (2 results)

All 2021 Other

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Remarks (1 results)

  • [Journal Article] Designing positive electrodes with high energy density for lithium-ion batteries2021

    • Author(s)
      Okubo Masashi、Ko Seongjae、Dwibedi Debasmita、Yamada Atsuo
    • Journal Title

      Journal of Materials Chemistry A

      Volume: 9 Issue: 12 Pages: 7407-7421

    • DOI

      10.1039/d0ta10252k

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Remarks] 東京大学 工学系研究科 化学システム工学専攻 山田研究室

    • URL

      http://www.yamada-lab.t.u-tokyo.ac.jp/

    • Related Report
      2020 Annual Research Report

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Published: 2020-07-07   Modified: 2024-03-26  

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