In-situ SQUID studies of electrochemically induced phenomena: Operando diagnosis of battery cathode charging and switching the magnetism of nanoporous alloys

Roland Würschum*

*Corresponding author for this work

Research output: Contribution to conferenceAbstract


Studying electrochemically induced phenomena by means of highly sensitive SQUID-magnetometry (superconducting quantum interference device) is very attractive, both for a deeper understanding of charging processes by a magnetic tool and for controlling magnetism by electrochemical stimuli. Both issues will be addressed in this talk.

The magnetic moment serves as highly sensitive fingerprint for the oxidation state of the transition metal ions in battery cathode materials thus enabling to identify the electrochemical ”active” ions. An overview will be given on operando magnetometry studies of the important class of LiNiCoMn-oxide cathode materials (so-called NMC with Ni:Co:Mn ratios of 1:1:1 and 3:1:1 [1, 2]) as well as of sodium vanadium phosphate cathodes [3]. In addition, first operando positron annihilation studies on a battery cathode material (NMC 1:1:1) will be presented yielding insight into lattice defects induced by charging and discharging [4].

Regarding electrochemically induced variations of magnetism, nanoporous materials are particularly promising owing to their high surface-to-volume ratio. Measurements on nanoporous Pd(Co) obtained by dealloying will be presented which demonstrate reversible switching of magnetism by electrochemical hydrogen sorption [5].

Acknowledgement: Financial support by the Austrian Science Fund (FWF): P30070-N36 is appreciated. This work was performed in the framework of the interuniversity cooperation of TU Graz and Uni Graz on natural sciences (NAWI Graz).

[1] G. Klinser, S. Topolovec, H. Kren, S. Koller, W. Gössler, H. Krenn, R. Würschum, Appl. Phys. Letters 109 (2016) 213901, DOI: 10.1063/1.4968547
[2] G. Klinser, M. Stückler, H. Kren, S. Koller, W. Goessler, H.Krenn, R. Würschum, J. Power Sources 396 (2018) 791, DOI 10.1016/j.jpowsour.2018.06.090
[3] G. Klinser, R. Zettl, M. Wilkening, H. Krenn, I. Hanzu, R. Würschum, Phys. Chem. Chem. Phys. 21 (2019) 20151, DOI: 10.1039/C9CP04045E
[4] G. Klinser, H. Kren, S. Koller, R. Würschum, Appl. Phys. Letters 114 (2019) 013905-1, DOI: 10.1063/1.5081668
[5] M. Gössler, M. Albu, G. Klinser, E.-M. Steyskal, R. Würschum, Small (2019) 1904523, DOI: 10.1002/smll.201904523


SeminarEnergy Efficient Magnetoelectric Materials by Ionic Approaches: Fundamentals, Challenges and Perspectives
CityBad Honnef
Internet address

Fields of Expertise

  • Advanced Materials Science

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