Characterization of LiNi 0.9Co 0.05[Mn 1/2 Mg 1/2] 0.05O 2 solid solution for secondary lithium ion batteries

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

A CoMnMg co-substituted LiNi 0.9Co 0.05[Mn 1/2 Mg 1/2] 0.05O 2 solid solution was synthesized and characterized by XRD, XPS, SEM and its electrochemical electrochemical performance was investigated. Potato-like (∼ 15 μm) single phase LiNi 0.9Co 0.05[Mn 1/2 Mg 1/2] 0.05O 2 compound was obtained and its crystal structure was analyzed by Rietveld refinements. XPS results showed that Ni, Co, Mn and Mg at the surface of LiNi 0.9Co 0.05[Mn 1/2 Mg 1/2] 0.05O 2 powder exist at + 4, + 3, + 3 and + 2 oxidation states respectively. And Ni in the bulk was also determined to occur as electrochemical-active Ni 3 + ion, which is beneficial for high capacity electrode. The synthesized LiNi 0.9Co 0.05[Mn 1/2 Mg 1/2] 0.05O 2 can deliver a high initial discharge capacity of 191.5 mAhg - 1 at 0.2C rate and more than 93% of the initial specific discharge capacity was retained after 50 cycles.

Original languageEnglish
Pages (from-to)23-29
Number of pages7
JournalSolid State Ionics
Volume227
DOIs
Publication statusPublished - 29 Oct 2012
Externally publishedYes

Keywords

  • CoMnMg co-substitution
  • Electrochemical studies
  • Rechargeable lithium batteries
  • Solid solution

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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