Institute of Multidisciplinary Research for Advanced Materials, Tohoku University


LAST UPDATE 2021/05/07

  • 研究者氏名
    Researcher Name

    小林弘明 Hiroaki KOBAYASHI
    助教 Assistant Professor
  • 所属
    Professional Affiliation

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

    金属資源プロセス研究センター エネルギーデバイス化学研究分野
    Center for Mineral Processing and Metallurgy, Chemistry of Energy Conversion Devices
  • 研究キーワード
    Research Keywords

    Cathode for Secondary batteries
    Multi-electron redox reactions
Research Subject
Developments of Nano-Sized Cathode Materials using Multi-Electron Redox Reactions

研究の背景 Background


In recent decades, portable electronic devices, such as cellular phones, tablet PCs, and laptops, have become widespread, and electric vehicles have come into use. Lithium-ion batteries have been widely utilized for these high-power applications. With respect to approaches for remarkably improving the energy density of rechargeable batteries, the use of multi-electron redox reactions at cathodes that do not involve transition metals is effective.

研究の目標 Outcome


Developments of nano-materials as cathodes for rechargeable batteries such as magnesium-ion batteries and anion redox batteries. Based on advanced process of nano-materials synthesis including supercritical fluid process and mechanochemical process, we aimed at developing advanced energy devices with high energy and power densities.

研究図Research Figure

Fig.1. Concept of Lithium-peroxide batteries operating on redox reactions between oxide ions and peroxide ions at a cathode.

Fig.2. O K-edge XANES spectra of Co-doped Li2O cathode during charge. They were recorded in the total fluorescence yield mode.

Fig.3. Voltage curves of Co-doped Li2O cathode treated with Vinylene carbonate (VC). The cathode was assembled in a cell with Li anode and 1 M LiPF6/EC-DMC electrolyte containing 5vol% added VC. Charge–discharge were conducted at the current density of 50 mA g–1.

文献 / Publications

J. Power Sources 287, 220 (2015). J. Power Sources 306, 567 (2016). J. Power Sources 322, 49 (2016). J. Power Sources 340, 365 (2017). J. Electrochem. Soc. 164(4), A750 (2017).