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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
Host Researcher 山田 淳夫  東京大学, 大学院工学系研究科(工学部), 教授 (30359690)
Foreign Research Fellow 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 Granted (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 2020 fy dwelled on new high voltage electro-active materials with increased operating voltages and capacities. Putting polyanionic system known for their high voltages attributes as anvil, we unveiled a special category of anion engineering strategy that allowed us to identify polyanionic solid solutions of (VO)2SO4PO4. The combine incorporation of oxy, sulphate and phosphate anions not only rendered stable framework for alkali ion (Li/Na) insertion with a superior cycling performance but also exploited inductive effect to provide a high voltage insertion host. Further, Vanadium as a cation redox centre in the system provided multiple redox activity and thus a desirable capacity for the system.

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

Due to COVID situation, the experiments hit a low. However, with these newly developed cathode systems I am conducting an in-depth physico-chemical and electrochemical analysis for a deeper understanding of the electrochemical properties of each compound from the atomic scale to the bulk materials and device development. The stability of electrodes and electrolytes as well as their interfaces is crucial to achieve long cycle life and good safety features. In parallel, I am trying to improve the cycling performance and electrode stability via particle downsizing and carbon coating. I am also varying the mixing ratio of the two oxy polyanions to gauge the structural and electrochemical performance change.

Strategy for Future Research Activity

The obvious direct extension of the work would be a combine structural and electrochemical investigation, to gauge the observed multiple redox activity. To this end, I am planning to use synchrotron sources and extended X-ray fine structure (EXAFS) to effectively gauge each redox and structural state. Further, I will be using energy migration calculation for energy landscape of the system. Finally, I will comply all these results for journal publication. In parallel, I will conduct the similar research to investigate various unknown compositions differing cationic redox couples (e.g., Co3+/Co2+, Ni3+/Ni2+, Fe3+/ Fe2+ etc.) to gauge electroactive systems. Also, we will test these materials with super concentrated electrolyte and additives to provide the best cathode/electrolyte couple.

Report

(1 results)
  • 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

      J. Mater. Chem. A

      Volume: 9 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

URL: 

Published: 2020-07-07   Modified: 2021-12-27  

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