Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (12): 2278-2284.doi: 10.3866/PKU.WHXB201510136

• THEORETICALAND COMPUTATIONAL CHEMISTRY • Previous Articles     Next Articles

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)

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