物理化学学报 >> 2015, Vol. 31 >> Issue (12): 2278-2284.doi: 10.3866/PKU.WHXB201510136

理论与计算化学 上一篇    下一篇

新型二维碳化物晶体储锂性能的理论研究

陈进峰,胡前库*(),周爱国,孙丹丹   

  1. 1 河南理工大学材料科学与工程学院,河南焦作454000
  • 收稿日期:2015-07-17 发布日期:2015-12-04
  • 通讯作者: 胡前库 E-mail:hqk@hpu.edu.cn
  • 基金资助:
    国家自然科学基金(51202058, 51205111, 51472075);河南理工大学创新型科研团队(T2013-4);河南理工大学杰出青年基金(J2015-3)

Theoretical Studies of Lithium Storage Properties of Novel Two-Dimensional Carbides

Jin-Feng. CHEN,Qian-Ku. HU*(),Ai-Guo. ZHOU,Dan-Dan. SUN   

  1. 1 School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan Province, P. R. China
  • Received:2015-07-17 Published:2015-12-04
  • Contact: Qian-Ku. HU E-mail:hqk@hpu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(51202058, 51205111, 51472075);Foundation of InnovativeResearch Team in Henan Polytechnic University, China(T2013-4);Special Foundation for Distinguished Young Scholars of Henan PolytechnicUniversity, China(J2015-3)

摘要:

MXenes是一类新型的二维金属碳化物或碳氮化物.本文使用密度泛函理论,分别研究了其中Ti2C、Nb2C和V2C的结构与储锂性能,以及表面氟(F)官能团对其结构和储锂性能的影响.吸附能、态密度和电荷布居的计算结果表明:该二维晶体表面可以吸附双层锂原子. Ti2C、V2C和Nb2C最高储Li的理论比容量分别为995.04、941.31、541.93 mAh·g-1.此外, F官能团可以有效提高这三种二维晶体锂化结构的稳定性与导电性.

关键词: MXene, 二维晶体, 密度泛函理论, 锂电池

Abstract:

MXenes are a new series of two-dimensional (2D) carbides or nitrides. Lithium storage properties and lithiated structures of three MXenes phases, Ti2C, V2C, and Nb2C, are studied by density functional theory. Additionally, the influence of fluorine functional groups on the lithiated structures and properties are also investigated. By calculating the adsorption energy, density of state, and charge population, we observe that double Li atom layers can be adsorbed on the surfaces of MXenes. For Ti2C, V2C, and Nb2C, the calculated maximum Li capacities reach values up to 995.04, 941.31, and 541.93 mAh·g-1, respectively. Fluorine functional groups are observed to effectively enhance the stability and conductivity of the lithiated structures of these three 2D crystals.

Key words: MXene, 2D crystal, Density functional theory, Li-battery

MSC2000: 

  • O641