期刊
APPLIED SURFACE SCIENCE
卷 543, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148772
关键词
MXenes; Anode materials; 2D heterostructures; Rechargeable batteries; DFT
类别
资金
- City University of Hong Kong [7005079]
- Research Grant Council of Hong Kong [11306517, 11305919]
- NSFC/RGC Joint Research Scheme [N_CityU104/19]
Two heterostructures VS2/Ti2CT2 with small lattice mismatch are proposed as promising high-performance anode materials for Li, Na, and Mg-ion batteries, exhibiting superior metal conductivities and stronger adsorption properties towards Li, Na, and Mg atoms, thus achieving higher capacities.
Ti2CO2 is one of the lightest MXenes, which is beneficial for achieving higher capacity as electrode material for batteries. However, its semiconductor conductivity has a negative effect on its charging/discharging rate and cyclability performance as electrode materials for batteries. Integrating two different two-dimensional materials to form heterostructures is an effective strategy to optimize the properties of materials. In this work, two heterostructures VS2/Ti2CT2 (T = O and S) are constructed and their electrochemical performances as anode materials for Li, Na and Mg-ion batteries are explored based on first-principles calculations. First of all, the lattice mismatch of these two heterostructures are relatively small, particularly, the lattice mismatch of VS2/Ti2CS2 is as low as 0.63%. Besides, compared with common graphene/Ti2CO2 and MoS2/Ti2CO2 heterostructures, VS2/ Ti2CT2 simultaneously exhibit superior metal conductivities and stronger adsorption properties towards Li, Na and Mg atoms, thus achieving higher capacities. Considering the strong adsorption properties, suitable diffusion energy barriers, low open circuit voltages and high capacities, VS2/Ti2CO2 and VS2/Ti2CS2 are proposed to be promising high-performance anode materials for Mg-ion batteries, and VS2/Ti2CS2 is a preferable anode material for Na-ion batteries.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据