Insight into cobalt-doping in Li2FeSiO4 cathode material for lithium-ion battery

Lu Lu Zhang, Song Duan, Xue Lin Yang, Gan Liang, Yun Hui Huang, Xing Zhong Cao, Jing Yang, Ming Li, Mark C. Croft, Cale Lewis

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

This study presents the preparation and electrochemical performance of cobalt-doped Li2FeSiO4/C (Co-doped LFS/C) composite by using a solid-state reaction assisted with refluxing process. The Co-doped LFS/C composite delivers a higher discharge capacity of 142.5 mAh g-1 at 3.0 C even after 100 cycles compared with pristine LFS/C. A clear feature of cobalt-doping in Li2FeSiO4 has been specified by X-ray powder diffraction, X-ray photoelectron spectroscopy coupled with Ar-ion sputtering, X-ray absorption spectroscopy, and positron annihilation lifetime spectroscopy. It is confirmed that Co has been successfully doped into the lattice of LFS, and Co-doping does not change the monoclinic structure of LFS and the oxidation state of Fe. Positron annihilation lifetime spectroscopy analysis further demonstrates that Co-doping increases the defect concentration and the electronic conductivity of LFS. The results clarify the nature of cobalt-doping in LFS and are helpful for understanding the enhancement mechanism of the electrochemical performance of LFS and other cathode materials.

Original languageEnglish (US)
Pages (from-to)194-202
Number of pages9
JournalJournal of Power Sources
Volume274
DOIs
StatePublished - Jan 15 2015

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Keywords

  • Cathode
  • Cobalt-doping
  • Lithium ion battery
  • Lithium iron silicate

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