Synthesis and characterization of lithium manganese oxides with core-shell Li4Mn5O12@Li2MnO3 structure as lithium battery electrode materials

Yumei Li, Yoji Makita, Zhenzhen Lin, Shuangmei Lin, Noriyuki Nagaoka, Xiaojing Yang

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

By a facile LiNO3 flux method, lithium manganese oxide composites (xLi4Mn5O12· yLi 2MnO3) were synthesized using a hierarchical organization precursor of manganese dioxide. Li4Mn5O12 and Li2MnO3 have spinel and rocksalt structures, respectively. The lithiation and structural transformation from the precursor to the composites occurred topotactically from exterior toward interior in the precursor particle with the increase of reaction time, and the composites had core-shell spinel@rocksalt structures in addition to the original hierarchical core-shell organization. The electrochemical measurements at 50 °C after 50 cycles confirmed that a typical spinel@rocksalt cathode had higher capacity retention (87.1%) than that with the composition close to the stoichiometric spinel (64.6%), indicating the Li2MnO3 shell can improve cycling stability for the composite electrode at elevated temperature.

Original languageEnglish
Pages (from-to)34-40
Number of pages7
JournalSolid State Ionics
Volume196
Issue number1
DOIs
Publication statusPublished - Aug 11 2011
Externally publishedYes

Keywords

  • Cathode materials
  • Charge/discharge
  • Core-shell
  • Lithium manganese oxides

ASJC Scopus subject areas

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

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