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Synergistic Effect of Co and Mn Co-Doping on SnO2 Lithium-Ion Anodes

Authors
  • Birrozzi, A
  • Mullaliu, A
  • Eisenmann, T
  • Asenbauer, J
  • Diemant, T
  • Geiger, D
  • Kaiser, U
  • de Souza, DO
  • Ashton, TE
  • Groves, AR
  • Darr, JA
  • Passerini, S
  • Bresser, D
Publication Date
Apr 01, 2022
Source
UCL Discovery
Keywords
Language
English
License
Unknown
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Abstract

The incorporation of transition metals (TMs) such as Co, Fe, and Mn into SnO2 substantially improves the reversibility of the conversion and the alloying reaction when used as a negative electrode active material in lithium-ion batteries. Moreover, it was shown that the specific benefits of different TM dopants can be combined when introducing more than one dopant into the SnO2 lattice. Herein, a careful characterization of Co and Mn co-doped SnO2 via transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy and X-ray diffraction including Rietveld refinement is reported. Based on this in-depth investigation of the crystal structure and the distribution of the two TM dopants within the lattice, an ex situ X-ray photoelectron spectroscopy and ex situ X-ray absorption spectroscopy were performed to better understand the de-/lithiation mechanism and the synergistic impact of the Co and Mn co-doping. The results specifically suggest that the antithetical redox behaviour of the two dopants might play a decisive role for the enhanced reversibility of the de-/lithiation reaction.

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