尖晶石
材料科学
阴极
电池(电)
镁
化学工程
储能
氧化物
硫化物
锂(药物)
冶金
化学
物理化学
功率(物理)
内分泌学
工程类
物理
医学
量子力学
作者
Hiroaki Kobayashi,Yu Fukumi,Hiroto Watanabe,Reona Iimura,Naomi Nishimura,Toshihiko Mandai,Yoichi Tominaga,Masanobu Nakayama,Tetsu Ichitsubo,Itaru Honma,Hiroaki Imai
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-01-20
卷期号:17 (3): 3135-3142
标识
DOI:10.1021/acsnano.2c12392
摘要
Magnesium rechargeable batteries (MRBs) promise to be the next post lithium-ion batteries that can help meet the increasing demand for high-energy, cost-effective, high-safety energy storage devices. Early prototype MRBs that use molybdenum-sulfide cathodes have low terminal voltages, requiring the development of oxide-based cathodes capable of overcoming the sulfide's low Mg2+ conductivity. Here, we fabricate an ultraporous (>500 m2 g-1) and ultrasmall (<2.5 nm) cubic spinel MgMn2O4 (MMO) by a freeze-dry assisted room-temperature alcohol reduction process. While the as-fabricated MMO exhibits a discharge capacity of 160 mAh g-1, the removal of its surface hydroxy groups by heat-treatment activates it without structural change, improving its discharge capacity to 270 mAh g-1─the theoretical capacity at room temperature. These results are made possible by the ultraporous, ultrasmall particles that stabilize the metastable cubic spinel phase, promoting both the Mg2+ insertion/deintercalation in the MMO and the reversible transformation between the cubic spinel and cubic rock-salt phases.
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