高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (6): 20240043.doi: 10.7503/cjcu20240043

• 物理化学 • 上一篇    下一篇

二维半导体R57-BN作为钠离子电池阳极材料的理论研究

王文春, 马天赐, 刘春生()   

  1. 南京邮电大学电子与光学工程学院, 南京 210023
  • 收稿日期:2024-01-23 出版日期:2024-06-10 发布日期:2024-04-19
  • 通讯作者: 刘春生 E-mail:csliu@njupt.edu.cn
  • 基金资助:
    国家自然科学基金(61974068)

Theoretical Research of Two-dimensional Semiconductor R57-BN as Anode Material of Sodium-ion Battery

WANG Wenchun, MA Tianci, LIU Chunsheng()   

  1. College of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China
  • Received:2024-01-23 Online:2024-06-10 Published:2024-04-19
  • Contact: LIU Chunsheng E-mail:csliu@njupt.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(61974068)

摘要:

预测了一种由硼氮元素组成的五边形、 七边形二维半导体结构——R57-BN, 并基于第一性原理计算对R57-BN作为钠离子电池阳极材料的电化学性能进行了研究. 结果表明, R57-BN具有良好的动力学和热力学稳定性, 其用作钠离子电池阳极时具有很高的理论比容量(662.40 mA·h/g). 钠在R57-BN表面的扩散势垒低至0.55 eV, 保证了R57-BN的快速充放电性能. 此外, 吸附钠原子后, R57-BN表现出由半导体向金属性质的转变, 保证了其良好的导电性. 同时, R57-BN具有较低的平均开路电压(0.50 V), 符合阳极材料的合理电压范围(0.1~1.0 V). 该研究表明, 单层R57-BN具有作为钠离子电池阳极材料的潜力, 为开发储钠阳极材料提供一个良好的研究思路.

关键词: 第一性原理, 二维材料, 电极材料, 金属离子电池

Abstract:

As promising alternatives to lithium-ion batteries(LIBs), sodium-ion batteries(SIBs) have garnered significant interest owing to the abundant resources, low cost, and similar storage mechanism with LIBs. However, the lack of suitable anode materials is a major bottleneck of SIBs. Two-dimensional(2D) materials are promising anode materials for batteries due to their large surface area and short diffusion paths. In this paper, a pentagonal and heptagonal 2D semiconductor structure R57-BN composed of B and N atom was predicted, and the electrochemical properties of R57-BN as anode material of SIBs were studied based on first-principles calculations. 2D R57-BN shows great stability in dynamic and thermodynamic aspects. The computation results reveal that Na atom can be adsorbed on R57-BN without clustering, and the adsorbed energy of Na-ion on the R57-BN is 1.55 eV. Even at low intercalated Na concentration, the Na adsorbed R57-BN system demonstrates metallic characteristics, showing good electronic conductivity. The diffusion barrier of Na diffusion on the surface of R57-BN is as low as 0.55 eV. Meanwhile, R57-BN has high specific capacity(662.40 mA·h/g) and suitable average open circuit voltage(VOC, 0.50 V). Based on the above results, R57-BN can serve as a potential anode material for SIBs. The present research can provide a good theoretical basis and thus conduce to guiding the developing of good Na storage materials, and also supply strong background for experimental researches.

Key words: First-principle calculation, Two-dimensional material, Electrode material, Metal-ion battery

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