Methods for determination of the degree of iron oxidation in LiFePO4

Fyodor Malchik, Andrey Kurbatov, Alina Galeyeva, Duysek Kamysbaev, Alexandru Horatiu Marincas

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2 Scopus citations


The disposal of LiFePO4 (LFP) cathode material through oxidation in an air atmosphere is explained by its high chemical activity and high surface area (especially for nanoparticles). In this article, new methods for the determination of the degree of iron oxidation in LFP (oxidation degree) are taken into consideration, specifically those which do not require complicated hardware support. The proposed methods are based on electrochemical oxidation (coulometric method) and chemical oxidation (chemical oxidation in alkaline and acidic solutions). As an arbitration method for analyzing the iron state, the method of Mössbauer spectroscopy (being the most proven and reliable method) was chosen. With respect to the proposed methods for determination of the oxidation degree, the most reliable and quick approach is the titrimetric method (oxidation in an acidic medium), which is in good correlation with Mossbauer spectroscopy. The coulometric method is also able to determine the material oxidation degree (with some approximation), but it requires a number of conditions in order to eliminate errors.

Original languageEnglish
Article number981
JournalApplied Sciences (Switzerland)
Issue number10
StatePublished - 24 Sep 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 by the authors.


  • Chemical oxidation
  • LiFePO cathode material
  • Lithium ion battery
  • Oxidation degree


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