Resonant inelastic X-ray scattering and X-ray absorption spectroscopy on the negative electrode material Li0.5Ni0.25TiOPO 4 in a Li-ion battery

H. M. Hollmark, K. Maher, I. Saadoune, T. Gustafsson, K. Edström, L. C. Duda

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Abstract

We have studied the first lithiation/delithiation cycle of the Li-ion battery electrode material LixNi0.25TiOPO4 applying X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS). A set of ten identical LixNi 0.25TiOPO4 battery electrodes have been cycled and left in different states of charge in the range of x = 0.5 ... 2.5, before disassembly in an Ar filled glove box. We find that Ni-, Ti-, and O-ions are affected simultaneously, rather than sequentially, upon lithiation of the material. In particular, Ni is reduced from Ni2+ to Ni0 but only partially re-oxidized to Ni1+, again, by delithiation. Overall, there is considerable "crosstalk" between the different atomic species and non-linearity in the response of the electronic structure during the lithiation/delithiation process. Fortuitously, the background variation in Ni L-XAS shows to contain valuable information about solid-electrolyte interface (SEI) creation, showing that the SEI is a function of the degree of lithiation.

Original languageEnglish
Pages (from-to)6544-6551
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume13
Issue number14
DOIs
Publication statusPublished - 14 Apr 2011

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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