Journal of Solid State Electrochemistry

, Volume 20, Issue 5, pp 1491–1496 | Cite as

Operando magnetometry on Li x CoO2 during charging/discharging

  • Stefan Topolovec
  • Harald Kren
  • Gregor Klinser
  • Stefan Koller
  • Heinz Krenn
  • Roland Würschum
Short Communication


Operando measurements of the magnetic susceptibility χ during electrochemical charging of commercially used battery electrode materials are implemented in a superconducting quantum interference device magnetometer. The capability of this measurement set-up to study electronic and chemical processes in the electrode is exemplified by Li x CoO 2 cathodes, for which reversible variations of their susceptibility χ by more than a factor of 1.5 could be continuously monitored. From the variation of χ with Li-ion concentration x for 1>x≥0.77, where Pauli paramagnetism prevails, a linear increase of the electronic density of states with Li extraction is derived, indicating that the occurring nonmetal-metal transition is of Anderson-type. For x<0.77, the change of χ(x) was assigned to alterations of the Co oxidation state, with the slope of χ(x) revealing that in addition to Co also O undergoes partial oxidation during charging. The observed increase of χ at the beginning of the discharging process could be an indication for the formation of Co\(^{2^{+}}\) at the electrode surface during reduction.


Lithium-ion batteries Operando study Magnetic susceptibility LiCoO2 



The authors would like to thank C. Baumann for performing the dip-coating of the LiCoO 2 cathodes. Financial support by the Graz inter-university cooperation on natural sciences (NAWI Graz) is appreciated.

Supplementary material

10008_2015_3110_MOESM1_ESM.pdf (365 kb)
(PDF 371 KB)


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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Stefan Topolovec
    • 1
  • Harald Kren
    • 2
  • Gregor Klinser
    • 1
  • Stefan Koller
    • 2
  • Heinz Krenn
    • 3
  • Roland Würschum
    • 1
  1. 1.Institute of Materials PhysicsGraz University of TechnologyGrazAustria
  2. 2.VARTA Micro Innovation GmbHGrazAustria
  3. 3.Institute of PhysicsUniversity of GrazGrazAustria

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