Structural and electrochemical properties of Co-Mn-Mg multi-doped nickel based cathode materials LiNi0.9Co0.1-x[Mn 1/2Mg1/2]xO2 for secondary lithium ion batteries

Qiang Liu, Ke Du, Hongwei Guo, Zhong Dong Peng, Yan Bing Cao, Guo Rong Hu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

43 Citations (Scopus)

Abstract

Co, Mn and Mg co-doped lithium nickel oxides of the nominal composition LiNi0.9Co0.1-x[Mn1/2Mg1/2] xO2 (x = 0.00, 0.02, 0.04, 0.06) are synthesized by a co-precipitation technique and solid state route. XPS results reveal that the oxidation states of Ni, Co, Mn and Mg are +3, +3, +4 and +2, respectively. An ordered α-NaFeO2 rock salt structure with R-3̄m symmetry has been confirmed by XRD. The cation mixing of Li/Ni and occupation of Mg ions have been analyzed by Rieveld refinement. Mg ions distribute between 3b and 3a sites in the crystal. Meanwhile a substantial reduction of cation mixing of Li-Ni has been confirmed by Mn-Mg substitution. Better cycling performance is observed in the compound with high Mn-Mg content compared with LiNi 0.9Co0.1O2. Mn-Mg substitution for Co has been shown to suppress the increase of the cell impedance during cycles effectively.

Original languageEnglish
Pages (from-to)350-357
Number of pages8
JournalElectrochimica Acta
Volume90
DOIs
Publication statusPublished - 15 Feb 2013
Externally publishedYes

Keywords

  • Co, Mn and Mg multi-doping
  • Electrochemical study
  • Ni-based layered cathode
  • Structural study

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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