Hydrothermal synthesis and electrochemical performance of nanoparticle Li2FeSiO4/C cathode materials for lithium ion batteries

Yimeng Xu, Wei Shen, Cong Wang, Aili Zhang, Qunjie Xu, Haimei Liu, Yonggang Wang, Yongyao Xia

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

Li2FeSiO4 nanoparticles are successfully synthesized via hydrothermal approach, with the hydrothermal process monitored in detail. Structural characterizations by XRD, FTIR, SEM and HRTEM measurements reveal that the Li2FeSiO4 nanoparticles have a high crystalline degree and monodisperse nanoparticle shape with a size around of 50-200 nm. To further improve the electronic conductivity, the Li2FeSiO4 nanoparticles are coated by a carbon layer using in suit polymerization of dopamine. Moreover, the effect of carbon content for electrochemical performance of Li2FeSiO4/C is systemically investigated, and as a result, the composite with a ratio of Li2FeSiO4 and dopamine of 3:1 demonstrate the best electrochemical performance with a discharge specific capacity of 148 mA h g-1 at a rate of 0.1 C at room temperature. Furthermore, the electrochemical performance of Li2FeSiO4/C at high temperature of 55 °C is also investigated, and it also exhibits a good performance with a discharge specific capacity of 240 mA h g-1at a current rate of 0.2 C.

Original languageEnglish
Pages (from-to)340-347
Number of pages8
JournalElectrochimica Acta
Volume167
DOIs
Publication statusPublished - 10 Jun 2015
Externally publishedYes

Keywords

  • Cathode
  • Hydrothermal
  • Lithium ion batteries
  • Lithium iron silicate
  • Nanoparticles

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