A Nanoparticle ZnMn₂O₄/Graphene Composite Cathode Doubles the Reversible Capacity in an Aqueous Zn-Ion Battery

KOBAYASHI Hiroaki MATSUI Masaki

Department of Chemistry

Aug. 20, 2024

開発したZnMn₂O₄極小ナノ粒子とグラフェンの複合体正極材料

Press release (in Japanese)

Abstract
Zinc-ion batteries (ZIBs) are promising grid-scale energy storage devices owing to their low cost, high energy/power densities, high safety, benign environmental impact, etc. Among various cathode materials, ZnMn₂O₄ spinel has attracted attention because of its high theoretical capacity (448 mAh g⁻¹) associated with the two-electron redox reaction of Mn ions (2+/4+), a higher voltage (≈1.4 V vs Zn/Zn²⁺) than V₂O₅-based cathodes (≈1.0 V), and better cyclability among manganese oxide-based cathodes. However, so far only the one-electron reaction of Mn ions is used with ZnMn₂O₄ spinel (≈224 mAh g⁻¹), impairing its attractive features. In this study, ….

Read the original article on Advanced Functional Materials

Article Information:
Yuto Katsuyama, Chie Ooka, Ruijie Zhu, Reona Iimura, Masaki Matsui, Richard B. Kaner, Itaru Honma, Hiroaki Kobayashi
A Nanoparticle ZnMn₂O₄/Graphene Composite Cathode Doubles the Reversible Capacity in an Aqueous Zn-Ion Battery
Advanced Functional Materials,09 August 2024
DOI:10.1002/adfm.202405551