Effects of transition metal doping and surface treatment to improve the electrochemical performance of Li2MnO3

Soo Kim, Jae Kyo Noh, Seungho Yu, Wonyoung Chang, Kyung Yoon Chung, Byung Won Cho

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

A novel strategy to improve the electrochemical performance of Li 2MnO3 using transition metal doping by the mechanochemical process is proposed. Li2MnO3 precursors are treated with transition metal containing chemicals in the mechanochemical process, followed by heat treatment. Cr containing Li2MnO3, with only 1 mol% Cr doping, exhibits unique electrochemical properties with a large initial discharge capacity of 234.9 mAh g-1, which is superior to the 205.0 mAh g-1 of pristine Li2MnO3, and all other transition-metal containing oxides. The structures of Li2MnO 3 and Li2MnO3 with the transition metal element doping (TM-Li2MnO3) are studied by x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), and the electrochemical characteristics are further investigated using electrochemical impedance spectroscopy (EIS) measurements.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalJournal of Electroceramics
Volume30
Issue number3
DOIs
Publication statusPublished - 2013 May
Externally publishedYes

Keywords

  • Doping
  • LiMnO
  • Lithium ion battery
  • Mechanochemical process
  • Surface treatment

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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