Performance investigation of Ti x N x-1O2 MXene (x=2, 3, 4) as anode materials for Na-ion batteries by first-principles calculation

被引:1
作者
Zhang, Wenshu [1 ,2 ]
Qu, Jianping [1 ,2 ]
Wang, Xudong [1 ,2 ]
Huang, Hao [1 ]
Yao, Man [1 ,2 ]
机构
[1] Dalian Univ Technol, Sch Mat Sci & Engn, Dalian 116024, Peoples R China
[2] Dalian Univ Technol, Key Lab Solidificat Control & Digital Preparat Te, Dalian 116024, Peoples R China
基金
中国国家自然科学基金;
关键词
sodium-ion battery; nitride MXene; different thickness; density functional theory; CAPACITY ELECTRODE MATERIAL; TOTAL-ENERGY CALCULATIONS; ELASTIC BAND METHOD; TI3C2; MXENE; LI; INTERCALATION; POTENTIALS; PREDICTION; MONOLAYERS; EFFICIENCY;
D O I
10.1088/1361-6528/ac8f99
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The number of MXene layers plays a crucial role in their performance when they are used as anode materials for sodium-ion batteries. Herein, Ti-based nitride MXenes with different layers, Ti (x) N x-1O2 MXene (x = 2, 3, 4) structures, were constructed to calculate the structural stability of their precursor, electronic properties after etching, and sodium storage behavior compared with the common Ti2CO2 and Ti3C2O2 MXene. First-principles calculations indicate that nitride MXenes possess a better rate capability than carbide MXenes of the same thickness. Moreover, the barrier for Na diffusion on the Ti2NO2 MXene surface (0.114 eV) is lowest. Meanwhile, comparing the properties of three nitride MXenes with different thicknesses, Ti2NO2 MXene performs relatively well with a high theoretical capacity with 756 mAh g(-1) and a lower open circuit voltage of 1.1 V. In conclusion, the performance improvement of nitride MXene is not linear with thickness, because that of Ti3N2O2 MXene is relatively weaker. This work lays the foundation for the feasibility of Ti3N2T (x) experimental preparation and provides corresponding evidence on the choice of MXene thickness. More attention should be paid to the etching method for Ti2NT (x) MXene.
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页数:9
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