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Journal of Materials Science

, Volume 46, Issue 18, pp 6106–6110 | Cite as

Preparation of cobalt ferrite nanoparticles by using spent Li-ion batteries

  • Li YangEmail author
  • Qinghua Yan
  • Guoxi Xi
  • Liyuan Niu
  • Tianjun Lou
  • Tianxi Wang
  • Xinsheng Wang
Article

Abstract

Cobalt ferrite nanoparticles are a soft magnetic material have been extensively used in many electronic and magnetic applications. In this study, Co0.8Fe2.2O4 nanoparticles with particle size of about 23.5 nm were directly synthesized by sol–gel auto-combustion and calcination methods using spent Li-ion batteries as raw materials. The overall process involves four steps: formation of homogeneous sols; formation of dried gels; combustion of the dried gels; and calcination of the dried gels after combustion at 1173 K for 2 h. The DTA–TG and IR were used to study the auto-combustion and thermal decomposition of the precursor, the morphology and structure of cobalt ferrite nanoparticles were characterized by XRD and TEM techniques. Moreover, the precise metal ion stoichiometry of cobalt ferrite nanoparticles was analyzed by ICP. The results revealed that the auto-combustion process was considered as a heat-induced exothermic oxidation–reduction reaction between nitrate ions and carboxyl group. The XRD patterns of calcination the dried gels after combustion confirmed the single phase spinel structure for the synthesized materials. The crystallite size was calculated from the most intense peak (3 1 1) using the Scherrer equation. The TEM photograph also shown that cobalt ferrite nanoparticles were well-dispersed and with little aggregation.

Keywords

Ferrite Inductively Couple Plasma Transmission Electron Microscopy Photograph Cathodic Active Material Cobalt Ferrite Nanoparticles 

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Li Yang
    • 1
    Email author
  • Qinghua Yan
    • 2
  • Guoxi Xi
    • 3
  • Liyuan Niu
    • 1
  • Tianjun Lou
    • 1
  • Tianxi Wang
    • 1
  • Xinsheng Wang
    • 1
  1. 1.Department of Experimental CenterHenan Institute of Science and TechnologyXinxiangChina
  2. 2.Department of Life Science and TechnologyXinxiang Medical CollegeXinxiangChina
  3. 3.The Key Laboratory for Environmental Pollution Control of HenanChemistry and Environment Science College of Henan Normal UniversityXinxiangChina

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