Electronic structural studies on the improved thermal stability of Li(Ni0.8Co0.15Al0.05)O2 by ZrO2 coating for lithium ion batteries

Ji Young Kim, Sang Hoon Kim, Dong Hyun Kim, Dieky Susanto, Se Young Kim, Won Young Chang, Byung Won Cho, Won Sub Yoon, Seong Min Bak, Xiao Qing Yang, Kyung Wan Nam, Kyung Yoon Chung

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11 Scopus citations

Abstract

Abstract: The electronic structures of bare and ZrO2-coated Li(Ni0.8Co0.15Al0.05)O2 electrode systems were investigated using a combination of time-resolved X-ray diffraction and soft X-ray absorption spectroscopy (XAS) techniques. The ZrO2 coating on the surface of Li(Ni0.8Co0.15Al0.05)O2 was effective in elevating the onset temperature of the dissociation of charged Li0.33(Ni0.8Co0.15Al0.05)O2, which will enhance the safety of Li-ion cells. Soft XAS spectra of the Ni LII,III-edge in the partial electron yield mode were obtained, which showed that the enhanced electrochemical properties and thermal stability of the cathode materials by ZrO2 coating can be attributed to the suppression of unwanted Ni oxidation state changes at the surface. Graphical Abstract: The electronic structural effects of a ZrO2 coating on Li(Ni0.8Co0.15Al0.05)O2 were examined by soft X-ray absorption spectroscopy. The coating stabilized the Ni oxidation state at the electrode surface against decomposition [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)565-572
Number of pages8
JournalJournal of Applied Electrochemistry
Volume47
Issue number5
DOIs
StatePublished - 1 May 2017

Keywords

  • Batteries
  • Li(NiCoAl)O
  • Soft X-ray absorption spectroscopy (XAS)
  • Thermal stability
  • ZrO coating

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