Ultra-Low-Strain Calcium and Magnesium Ion Storage Enabled by Tunnel-Structured MoO₃ Positive Electrode

Department of Chemistry

May. 01, 2026

図1. トンネル構造型酸化モリブデン正極で進行する多価金属電池反応の模式図

Joint press release (in Japanese) by Tohoku University and Hokkaido University

Abstract
Rechargeable divalent batteries employing Ca or Mg metal negative electrodes have attracted considerable interest due to their low cost and potentially high energy density. However, the development of high-energy Ca and Mg batteries remains limited by the lack of oxide positive electrodes capable of reversibly accommodating divalent ions at room temperature. Here, we demonstrate a new positive electrode material, a nano-sized hexagonal tunnel-structured MoO3 (nano-h-MoO3), as a structurally robust host for both Ca2+ and Mg2+ storage, exhibiting markedly improved reversibility and capacities. Comprehensive structural analyses, supported by computational modeling, ……

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Article inforamation
Reona Iimura, M. D. Hashan C. Peiris, Takashi Yabu, Toshihiko Mandai, Ruijie Zhu, Akira Nasu, Saneyuki Ohno, Masaki Matsui, Itaru Honma, Manuel Smeu, Hiroaki Kobayashi, “Ultra-Low-Strain Calcium and Magnesium Ion Storage Enabled by Tunnel-Structured MoO₃ Positive Electrode” Advanced Energy Materials (2026): e71006. 
DOI: https://doi.org/10.1002/aenm.71006