期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 33, 期 7, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-648X/abc807
关键词
lithium-ion batteries; two-dimensional materials; density functional theory
资金
- UM Research Grant [GPF041B-2018]
The study indicates that 2D Mg2C shows metallic behavior and excellent electrical conductivity as an anode material for batteries, with high diffusivity for sodium and potassium ions and a high storage capacity.
Two-dimensional (2D) materials have recently emerged as potential candidates for high-capacity lithium-ion batteries anode materials because of their compelling physicochemical and structural properties. In the present study, we use first-principles calculations to investigate the performance of 2D Mg2C as anode materials for Li, Na, K and Ca-ions batteries. The calculated average open-circuit voltage are 0.37, 0.50, 0.03 and 0.06 eV vs Li, Na, K, Ca. No significant structural deformations are observed on the 2D Mg2C upon the adsorption of Li, Na, K or Ca and the metallic characteristic of the 2D Mg2C is retained. The metallic behaviour of both pristine and adsorbed Mg2C ensures the desirable electric conductivity, implying the advantages of 2D Mg2C for batteries. The Na and K atoms show an extremely high diffusivity on the 2D Mg2C with a low energy barrier of 0.08 and 0.04 eV respectively, which is about an order of magnitude smaller than that of Li atom. For the Na and K atoms, the theoretical storage capacity can reach up to 1770 mAh g(-1), nearly two times that of the Li atom of 885 mAh g(-1). Our study suggests that the 2D Mg2C is a promising anode material which offers a fast ion diffusion and high storage capacity.
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