| A High-Temperature β-Phase NaMnO_2 Stabilized by Cu Doping and Its Na Storage Properties |
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| 引用本文： | 蒋礼威,陆雅翔,王跃生,刘丽露,戚兴国,赵成龙,陈立泉,胡勇胜.A High-Temperature β-Phase NaMnO_2 Stabilized by Cu Doping and Its Na Storage Properties[J].中国物理快报,2018(4). |
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| 作者姓名： | 蒋礼威 陆雅翔 王跃生 刘丽露 戚兴国 赵成龙 陈立泉 胡勇胜 |
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| 摘 要： | The high-temperature β-phase NaMnO_2 is a promising material for Na-ion batteries(NIBs) due to its high capacity and abundant resources. However, the synthesis of phase-pure -NaMnO_2 is burdensome and costineffective because it needs to be sintered under oxygen atmosphere at high temperature and followed by a quenching procedure. Here we first report that the pure β phase can be stabilized by Cu-doping and easily synthesized by replacing a proportion of Mn with Cu via a simplified process including sintering in air and cooling to room temperature naturally. Based on the first-principle calculations, the band gap decreases from 0.7 eV to 0.3 eV, which indicates that the electronic conductivity can be improved by Cu-doping. The designed -NaCu_(0.1)Mn_(0.9)O_2 is applied as cathode in NIBs, exhibiting an energy density of 419 Wh/kg and better performance in terms of rate capability and cycling stability than those in the undoped case.
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