Sodium storage and transport properties in pyrolysis synthesized MoSe2 nanoplates for high performance sodium-ion batteries
Sodium storage and transport properties in pyrolysis synthesized MoSe2 nanoplates for high performance sodium-ion batteries
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DOI：
10.1016/j.jpowsour.2015.02.096
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发表时间：
2015-06
影响因子：
9.2
通讯作者：
Hui Wang;Xinzheng Lan;Danlu Jiang;Y. Zhang;H. Zhong;Zhongping Zhang;Yang Jiang
中科院分区：
文献类型：
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作者：
Hui Wang;Xinzheng Lan;Danlu Jiang;Y. Zhang;H. Zhong;Zhongping Zhang;Yang Jiang
由于缺乏理想的负极材料，新型钠离子电池的发展受到阻碍。在此，我们报告了层状 MoSe2 纳米板作为阳极材料的实验和理论评估。 MoSe2纳米板是通过简单的热分解过程成功合成的。作为阳极，MoSe2 纳米板能够在 0.1C 电流和 0.1-3 V 电压下分别提供 513 mAh g−1 和 440 mAh g−1 的初始放电和充电容量。对异位 XRD 图谱的分析表明，当 MoSe2 电极放电至 0.6 V 时，层间不存在滑移，并且钼的配位发生变化，并且还证明了随后的放电/充电过程中的转化反应。此外，还通过第一性原理计算研究了电子结构、Na离子输运和电导率。提出了准二维能量有利轨迹来说明MoSe2晶格中钠离子从八面体到四面体的空位跳跃迁移机制。结果表明，MoSe2 作为钠离子电池负极材料具有巨大的潜力。
The development of novel sodium-ion batteries has been hindered by the lack of ideal anode materials. Herein, we report both experimental and theoretical assessment of layered MoSe2nanoplates as the anode materials. The MoSe2nanoplates are successfully synthesized by a facile thermal-decomposition process. As the anode, the MoSe2nanoplates are capable of delivering the initial discharge and charge capacities of 513 and 440 mAh g−1at the current of 0.1C in a voltage of 0.1–3 V, respectively. The analysis of Ex-situ XRD patterns reveals that there is no slippage between layers and the change of coordination of molybdenum when the MoSe2electrode is discharged to 0.6 V and conversion reactions during the following discharge/charge process are also demonstrated. In addition, the electronic structure, Na ions transport and conductivity are investigated by first-principles calculation. A quasi-2D energy favorable trajectory is proposed to illustrate the sodium ion vacancy-hopping migration mechanism form octahedron to tetrahedron in MoSe2lattice. The results suggest great potential of MoSe2as an anode material for Na ion batteries.