Facile synthesis of LiMn0·75Fe0·25PO4/C composite cathode material and electronic conductivity of carbon coating

C. p. Hou, Y. Ma, H. Zhang, W. c. Geng, Q. y. Zhang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

LiMn0·75Fe0·25PO4/C powders were prepared by a facile hydrothermal and ball-milling method, and then calcined. X-ray diffraction and scanning electron microscopy revealed that the calcination temperature had a strong effect on the structure and morphology of the as-prepared powder, and thus, on the subsequent electrochemical performance of the material. When the calcination temperature was increased from 550 to 700°C, the grain size of LiMn0·75Fe0·25PO4/C increased greatly. The electronic conductivities of the carbon coatings, which were obtained from sucrose and calcined at 550 and 700°C, were investigated. The discharge capacities of LiMn0·75Fe0·25PO4/C decreased with increasing calcination temperature, but electrochemical impedance spectroscopy showed that the charge-transfer resistances of LiMn0·75Fe0·25PO4/C electrodes decreased owing to the increase in the electronic conductivity of the carbon coating. Grain growth played a more important role than the electronic conductivity of the carbon coating in the discharge capacity of the electrode. The powder calcined at 550°C exhibited the best electrochemical performance, with a discharge capacity of 131·9 mAh g−1 at a rate of 0·1 C.

Original languageEnglish
Pages (from-to)16-21
Number of pages6
JournalMaterials Technology
Volume33
Issue number1
DOIs
StatePublished - 2 Jan 2018

Keywords

  • calcination temperature
  • cathode material
  • electronic conductivity
  • Li-ion battery

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