Density functional theory calculations for evaluation of phosphorene as a potential anode material for magnesium batteries

被引:97
作者
Han, Xinpeng [1 ]
Liu, Cheng [1 ]
Sun, Jie [1 ]
Sendek, Austin D. [2 ]
Yang, Wensheng [3 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin, Peoples R China
[2] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA
[3] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
基金
新加坡国家研究基金会; 中国国家自然科学基金;
关键词
SODIUM-ION BATTERIES; HIGH-PERFORMANCE ANODE; LITHIUM METAL ANODES; BLACK PHOSPHORUS; ENERGY-STORAGE; RECHARGEABLE BATTERIES; DIOXIDE CATHODE; RED PHOSPHORUS; MG BATTERIES; COMPOSITE;
D O I
10.1039/c7ra12400g
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We have systematically investigated black phosphorus and its derivative - a novel 2D nanomaterial, phosphorene - as an anode material for magnesium-ion batteries. We first performed Density Functional Theory (DFT) simulations to calculate the Mg adsorption energy, specific capacity, and diffusion barriers on monolayer phosphorene. Using these results, we evaluated the main trends in binding energy and voltage as a function of Mg concentration. Our studies revealed the following findings: (1) Mg bonds strongly with the phosphorus atoms and exists in the cationic state; (2) Mg diffusion on phosphorene is fast and anisotropic with an energy barrier of only 0.09 eV along the zigzag direction; (3) the theoretical specific capacity is 865 mA h g(-1) with an average voltage of 0.833 V (vs. Mg/Mg2+), ideal for use as an anode. Given these results, we conclude that phosphorene is a very promising anode material for Mg-ion batteries. We then expand our simulations to the case of bulk black phosphorus, where we again find favorable binding energies. We also find that bulk black phosphorous must overcome a structural stress of 0.062 eV per atom due to a volumetric expansion of 33% during magnesiation. We found that the decrease in particle size is good to increase its specific capacity.
引用
收藏
页码:7196 / 7204
页数:9
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