期刊
ACS APPLIED NANO MATERIALS
卷 4, 期 8, 页码 8328-8333出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c01519
关键词
magnesium-ion batteries; cathode materials; metastable; nanoparticles; Mg-Mn spinel oxides
资金
- JSPS [17H06515]
- JST ALCA-SPRING [JPMJAL1301]
- Grants-in-Aid for Scientific Research [17H06515] Funding Source: KAKEN
The developed cubic MgMn2O4 spinel nanoparticles exhibit superior reversible capacity compared to tetragonal MgMn2O4 at room temperature, providing a promising cathode material for magnesium rechargeable batteries.
Magnesium rechargeable batteries are candidates for post-lithium-ion batteries owing to the low price and superior theoretical volume energy density of Mg anodes. As a promising cathode material, MgMn2O4 spinel has a high energy density with a high operating voltage, and a relatively high ionic conductivity. However, the tetragonal symmetry of MgMn2O4, originating from the Jahn-Teller effect of Mn3+ ions, causes irreversible structural changes during the charge/discharge process, leading to poor reversibility. We developed metastable cubic MgMn2O4 spinel nanoparticles using the hot-injection method under low-temperature solvothermal conditions. Compared to tetragonal MgMn2O4, its cubic phase exhibited a superior reversible capacity, both experimentally and theoretically, at room temperature.
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