Spinel-structured surface layers for facile Li ion transport and improved chemical stability of lithium manganese oxide spinel

Hae Ri Lee, Hyo Ree Seo, Boeun Lee, Byung Won Cho, Kwan Young Lee, Si Hyoung Oh

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Li-ion conducting spinel-structured oxide layer with a manganese oxidation state close to being tetravalent was prepared on aluminum-doped lithium manganese oxide spinel for improving the electrochemical performances at the elevated temperatures. This nanoscale surface layer provides a good ionic conduction path for lithium ion transport to the core and also serves as an excellent chemical barrier for protecting the high-capacity core material from manganese dissolution into the electrolyte. In this work, a simple wet process was employed to prepare thin LiAlMnO4 and LiMg0.5Mn1.5O4 layers on the surface of LiAl0.1Mn1.9O4. X-ray absorption studies revealed an oxidation state close to tetravalent manganese on the surface layer of coated materials. Materials with these surface coating layers exhibited excellent capacity retentions superior to the bare material, without undermining the lithium ion transport characteristics and the high rate performances.

Original languageEnglish
Pages (from-to)448-455
Number of pages8
JournalApplied Surface Science
Volume392
DOIs
Publication statusPublished - 2017 Jan 15

Keywords

  • LiMnO
  • Oxidation state
  • Spinel
  • Surface coating
  • X-Ray absorption spectroscopy

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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