Surface modification of LiMn2O4 thin films at elevated temperature

Dong Shu, Gopu Kumar, Kwang Bum Kim, Kwang Sun Ryu, Soon Ho Chang

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

In order to improve the cycle stability of spinel LiMn2O4 electrode at elevated temperature, the LiCoO2-coated and Co-doped LiMn2O4 film were prepared by an electrostatic spray deposition (ESD) technique. LiCoO2-coated LiMn2O4 film shows excellent cycling stability at 55 °C compared to pristine and Co-doped LiMn2O4 films. The samples were studied by X-ray diffraction, scanning electron microscopy, Auger electron spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy. The excellent performance of LiCoO2-coated LiMn2O4 film can be explained by suppression of Mn dissolution. On the other hand, the LiCoO2-layer on the LiMn2O4 surface allows a homogenous Li+ insertion/extraction during electrochemical cycles and improves its structure stability.

Original languageEnglish
Pages (from-to)227-233
Number of pages7
JournalSolid State Ionics
Volume160
Issue number3-4
DOIs
Publication statusPublished - 2003 Jun 1

Fingerprint

Surface treatment
Thin films
thin films
cycles
Temperature
temperature
Auger electron spectroscopy
Electrochemical impedance spectroscopy
Auger spectroscopy
Cyclic voltammetry
spinel
sprayers
electron spectroscopy
insertion
Electrostatics
dissolving
Dissolution
retarding
impedance
electrostatics

All Science Journal Classification (ASJC) codes

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Shu, Dong ; Kumar, Gopu ; Kim, Kwang Bum ; Ryu, Kwang Sun ; Chang, Soon Ho. / Surface modification of LiMn2O4 thin films at elevated temperature. In: Solid State Ionics. 2003 ; Vol. 160, No. 3-4. pp. 227-233.
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Surface modification of LiMn2O4 thin films at elevated temperature. / Shu, Dong; Kumar, Gopu; Kim, Kwang Bum; Ryu, Kwang Sun; Chang, Soon Ho.

In: Solid State Ionics, Vol. 160, No. 3-4, 01.06.2003, p. 227-233.

Research output: Contribution to journalArticle

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AU - Shu, Dong

AU - Kumar, Gopu

AU - Kim, Kwang Bum

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AB - In order to improve the cycle stability of spinel LiMn2O4 electrode at elevated temperature, the LiCoO2-coated and Co-doped LiMn2O4 film were prepared by an electrostatic spray deposition (ESD) technique. LiCoO2-coated LiMn2O4 film shows excellent cycling stability at 55 °C compared to pristine and Co-doped LiMn2O4 films. The samples were studied by X-ray diffraction, scanning electron microscopy, Auger electron spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy. The excellent performance of LiCoO2-coated LiMn2O4 film can be explained by suppression of Mn dissolution. On the other hand, the LiCoO2-layer on the LiMn2O4 surface allows a homogenous Li+ insertion/extraction during electrochemical cycles and improves its structure stability.

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