Pressure effects on the charge carrier transportation of polycrystalline LiCr0.35Mn0.65O2

Tingjing Hu, Xiaoyan Cui, Jie Yang, Yonghao Han, Hongwu Liu, Chunxiao Gao, Fei Du, Gang Chen

Research output: Contribution to journalArticlepeer-review

Abstract

LiCr0.35Mn0.65O2 powders were investigated by using in situ impedance spectroscopy under high pressure. The impedance spectroscopy of the Nyquist representation showed two overlapped arcs in the complex impedance plane which corresponded to the electrical transportation of grain and grain boundary respectively. By using the representation of Z ″/f versus Z ', the resistance and the relaxation frequency of grain and grain boundary were obtained under different pressures. It was found that at every phase transition region, both the resistance and the relaxation frequency of grain and grain boundary changed discontinuously. Pressure decreases the effective scattering section of grain and grain boundary to the charge carriers obviously and makes their transport easier. The variation of defects in the grain boundary region leads the sample resistance in the decompression process is much lower than that in the compression process. This indicates the pressure treatment has a positive contribution to the electrochemical performance of LiCr0.35Mn0.65O2.

Original languageEnglish
Pages (from-to)1672-1675
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume8
Issue number5
DOIs
Publication statusPublished - 2011 May 1

Keywords

  • Carrier transportation
  • Diamond anvil cell
  • Effective scattering section
  • In situ impedance spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics

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