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中南大学学报(英文版)

Journal of Central South University

Vol. 22    No. 6    June 2015

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First-principles investigation on structural and electrochemical properties of NaCoO2 for rechargeable Na-ion batteries
SU Jing-cang(粟劲苍)1, ZHOU Guang(周广)1, 2, PEI Yong(裴勇)1, YANG Zhen-hua(杨振华)3, WANG Xian-you(王先友)1

1. Key Laboratory of Environmentally Friendly Chemistry and Applications of Minister of Education,
(School of Chemistry, Xiangtan University), Xiangtan 411105, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
3. Faculty of Materials, Optoelectronics and Physics, Key Laboratory of Low Dimensional Materials &
Application Technology of Ministry of Education, Xiangtan University, Xiangtan 411105, China

Abstract:NaxCoO2 is a commonly used cathode material for sodium ion batteries because of its easy synthesis, high reversible capacity and good cyclability. the structural and electrochemical properties of NaxCoO2 during sodium ion insertion/extraction process are studied based on first principles calculations. The calculation results of crystal structure parameters and average intercalation voltage are in good agreement with experiment data. Through calculation of the geometric structure and charge transfer in charging and discharging processes of NaxCoO2, it is found that the oxygen atom surrounding Co of the CoO6 octahedral screens the coulomb potential produced by sodium vacancy in NaxCoO2, and the charge is removed from the entire Co-O layer instead of the Co atom adjacent to sodium vacancy when sodium ions are extracted from the NaCoO2 lattice. Thus, during the insertion/extraction of sodium ion from NaCoO2, the CoO6 octahedral structure undergoes small lattice distortion, which makes the local structure quite stable and is beneficial to the cycling stability of the material for the application of sodium ion batteries.

 

Key words: sodium ion batteries; first principles calculation; cathode material; electronic structure

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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