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Open AccessArticle

Methods for Determination of the Degree of Iron Oxidation in LiFePO4

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Center of Physical and Chemical Methods of Research and Analysis, al-Farabi Kazakh National University, 71 al-Farabi Ave., Almaty 050040, Kazakhstan
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Babes Bolyai University, Faculty of Chemistry and Chemical Engineering, 11 Arany Janos Street, 400028 Cluj-Napoca, Romania
*
Author to whom correspondence should be addressed.
Appl. Sci. 2017, 7(10), 981; https://doi.org/10.3390/app7100981
Received: 23 August 2017 / Revised: 20 September 2017 / Accepted: 20 September 2017 / Published: 24 September 2017
(This article belongs to the Section Chemistry)
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. View Full-Text
Keywords: LiFePO4 cathode material; lithium ion battery; oxidation degree; chemical oxidation LiFePO4 cathode material; lithium ion battery; oxidation degree; chemical oxidation
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Malchik, F.; Kurbatov, A.; Galeyeva, A.; Kamysbaev, D.; Marincas, A.-H. Methods for Determination of the Degree of Iron Oxidation in LiFePO4. Appl. Sci. 2017, 7, 981.

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