Synthesis and characterization of carbon-coated Li0.5Ni0.25TiOPO4 anode material

Kenza Maher, Kristina Edström, Ismael Saadoune, Torbjörn Gustafsson, Mohammed Mansori

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15 Citations (Scopus)

Abstract

Li0.5Ni0.25TiOPO4/C composite was synthesized by the co-precipitation method using polyethylene glycol as carbon source. X-ray diffraction study showed that the as-prepared material crystallizes in the monoclinic system (S.G. P21/c). This 3D structure exhibits an open framework favourable to intercalation reactions. The morphology and the microstructure characterisation was performed by scanning electron microscopy (SEM). Small particles (∼1 μm) coated by carbon were observed. Raman study confirms the presence of carbon graphite in the Li0.5Ni0.25TiOPO4/C composite. Cyclic voltammetry (CV) and charge-discharge galvanostatic cycling were used to characterize its electrochemical properties. The Li0.5Ni0.25TiOPO4/C composite exhibits excellent electrochemical performances with good capacity retention for 50 cycles. Approximately 200 mAh/g could be reached at C, C/2, C/5 and C/20 rates in the 0.5-3 V potential range. These results clearly evidenced the positive effect of the carbon coating on the electrochemical properties of the studied phosphate.

Original languageEnglish
Pages (from-to)5531-5536
Number of pages6
JournalElectrochimica Acta
Volume54
Issue number23
DOIs
Publication statusPublished - 30 Sep 2009

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Keywords

  • Carbon coating
  • Lithium ion batteries
  • Lithium nickel oxyphosphate
  • Raman spectroscopy

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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