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Showing 1–9 of 9 results
Advanced filters: Author: Naoaki Yabuuchi Clear advanced filters

  • Energy storage by metal redox reactions sets strict limits on capacity in metal oxide cathode materials used in lithium-ion batteries. Here authors study stabilization of redox reactions at oxygen sites and demonstrate a cathode with a high reversible capacity enabled by the process.

    • Naoaki Yabuuchi
    • Masanobu Nakayama
    • Toshiaki Ohta
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-10

  • With the cost of noble metal oxygen-reduction catalysts rendering some fuel cells and batteries prohibitively expensive, the search for effective and cheaper catalysts is underway and would be speeded up by ‘design principles’. Now, the catalytic activity of oxide materials has been correlated to σ*-orbital occupation and the extent of metal–oxygen covalency.

    • Jin Suntivich
    • Hubert A. Gasteiger
    • Yang Shao-Horn
    Research
    Nature Chemistry
    Volume: 3, P: 546-550

  • Delivering inherently stable lithium-ion batteries with electrodes that can reversibly insert and extract large quantities of Li+ with inherent stability during cycling are key. Lithium-excess vanadium oxides with a disordered rocksalt structure are now investigated as high-capacity and long-life cathodes.

    • Itsuki Konuma
    • Damian Goonetilleke
    • Naoaki Yabuuchi
    Research
    Nature Materials
    Volume: 22, P: 225-234

  • Through engineering of oxygen stacking and cation–cation interactions, a methodology to design high-energy and long-cycle-life lithium-rich battery materials is proposed.

    • Naoaki Yabuuchi
    News & Views
    Nature Materials
    Volume: 19, P: 372-373

  • A lithium battery whose positive electrode consists of functionalized carbon nanotubes can achieve higher energy densities than electrochemical capacitors while delivering higher power than conventional lithium-ion batteries.

    • Seung Woo Lee
    • Naoaki Yabuuchi
    • Yang Shao-Horn
    Research
    Nature Nanotechnology
    Volume: 5, P: 531-537

  • Although sodium is an abundant element that can be electrochemically and reversibly extracted from and inserted into layered materials, the resulting reversible capacity for storing energy remains low. A manganese–iron–sodium-based electrode is now shown to exhibit a reversible capacity of 190 mAh g−1 due to electrochemically active Fe3+/Fe4+ redox reactions.

    • Naoaki Yabuuchi
    • Masataka Kajiyama
    • Shinichi Komaba
    Research
    Nature Materials
    Volume: 11, P: 512-517

  • High-energy X-ray Compton measurements and first-principles modelling reveal how the electronic orbital responsible for the reversible anionic redox activity can be imaged and visualized, and its character and symmetry determined.

    • Hasnain Hafiz
    • Kosuke Suzuki
    • Venkatasubramanian Viswanathan
    Research
    Nature
    Volume: 594, P: 213-216

  • Organic compounds with conjugated carbonyl groups used as electrode material for secondary battery is attractive attention. We have been focused on disodium terephthalate and its polymer derivative as active anode material for secondary battery. Herein, we synthesized a novel vinyl polymer bearing an extended conjugated disodium dicarboxylate and it was evaluated as an anode active material for sodium-ion battery to discuss the correlation between structure and electrochemical properties. We suggest that the longer π-extended systems on the side chains provide a better anode performance of sodium-ion batteries.

    • Kazuki Sugawara
    • Naoaki Yabuuchi
    • Makoto Miyasaka
    Research
    Polymer Journal
    Volume: 54, P: 1111-1118