Supercritical hydrothermal synthesis of rod like Li2FeSiO 4 particles for cathode application in lithium ion batteries

M. K. Devaraju, Takaaki Tomai, Itaru Honma

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

A cheap and rapid supercritical hydrothermal method has been adopted for the synthesis of Li2FeSiO4 cathode materials for the application in lithium ion battery. The as-synthesized Li2FeSiO 4 particles at 380°C exhibited rod like morphology with 20.80 nm in diameter and 500 nm.1 μm in length character-ized by transmission electron microscopy (TEM). The Li2FeSiO4 material is systematically characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermo gravimetric analysis (TG),scanning transmission electron microscopy (STEM) and energy dispersive X-ray (EDX). The electrochem-ical measurements were carried out after coating of Li 2FeSiO4 particles with different weight percentageof conductive carbon. The discharge capacity of as-synthesized rod like Li 2FeSiO4 with 30 wt% conductivecarbon coating exhibited 177 mAh g-1 for the first cycle, which is more than that of as-synthesized and 20 wt% conductive carbon coated rod like Li 2FeSiO4 particles. The obtained discharge capacity is the high-est for this material without high temperature heat treatment, which indicating that rod like morphologywith diameter 20.80 nm could be more active during electrochemical reactions.

Original languageEnglish
Pages (from-to)75-81
Number of pages7
JournalElectrochimica Acta
Volume109
DOIs
Publication statusPublished - 2013

Keywords

  • Carbon coating
  • Discharge capacity
  • Li-ion battery
  • Lithium iron silicate
  • Rate capability

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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