Methods for determination of the degree of iron oxidation in LiFePO4

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

doi:10.3390/app7100981

Methods for determination of the degree of iron oxidation in LiFePO₄

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

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

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 language	English
Article number	981
Journal	Applied Sciences (Switzerland)
Volume	7
Issue number	10
DOIs	https://doi.org/10.3390/app7100981
State	Published - 24 Sep 2017
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2017 by the authors.

Funding

Acknowledgments: This work was supported by the grant from the Ministry of Education and Science of the Republic of Kazakhstan: 0143/PCF; 4186/GF4. 2. Li,J.;Yao,W.;Martin,S.;Vaknin,D.LithiumionconductivityinsinglecrystalLiFePO4. Solid State Ionics Autho2r0 0C8o, n17tr9i,b2u0t1io6–n2s0: 1 9M. [aClrcohsiksR Fe fa]nd Kurbatov A. performed the experiments analyzed data and wrote the p3.aperB (athrkeeser, aJu.;tShaoirdsi ,coMn.tYr.i;bSuwteody eeqr,uJa.Llly. Ltoit hthiuism wiororkn),( IGI)alpehyoesvpah Ao.-,o plievrifnoersmperde pthaer eedxpbeyriamneonvtse lancaarlybzoethde drmataa,l Kamysbaev D. performed electrochemical analysis and Marincas A‐H. helped to wrote the paper. 4. Tang, K.; Yu, X.; Sun, J.; Li, H.; Huang, X. Kinetic analysis on LiFePO4 thin films by CV, GITT, and EIS.

Funders	Funder number
Ministry of Education and Science of the Republic of Kazakhstan

Keywords

Chemical oxidation
LiFePO cathode material
Lithium ion battery
Oxidation degree

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.3390/app7100981

Cite this

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abstract = "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 M{\"o}ssbauer 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.",

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AU - Marincas, Alexandru Horatiu

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