Kinetic analysis on LiFePO4 thin films by CV, GITT, and EIS

Tang, Kun; Yu, Xiqian; Sun, Jingbo; Li, Hong; Huang, Xuejie

doi:10.1016/j.electacta.2011.02.119

Cited by 489 publications

(341 citation statements)

References 34 publications

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“…Currently, the relatively low conductivity and poor Li transport properties can be improved by reducing crystal size and changing the microstructure/morphology, using surface modification and forming composite structures. Using these various methods, the electronic conductivity and Li diffusion coefficients can be increased up to 10 -1 S/cm and 10 -9 cm 2 /s, respectively [7][8][9][10][11][12][13][14][15][16]. Another drawback of the LiFePO4 is its relatively small voltage (3.4 V vs.…”

Section: Introductionmentioning

confidence: 99%

Density functional theory study of lithium diffusion at the interface between olivine-type LiFePO₄and LiMnPO₄

Shi

Wang

2016

J. Phys. D: Appl. Phys.

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) Abstract:Coating LiMnPO4 with a thin layer of LiFePO4 shows a better electrochemical performance than the pure LiFePO4 and LiMnPO4, thus it is critical to understand Li diffusion at their interfaces to improve the performance of electrode materials. Li diffusion at the (100)LiFePO4//(100)LiMnPO4, (100) interface is in the range of 3.65×10 -11 -5.28×10 -12 cm 2 /s, which is larger than that in the pure LiMnPO4 with a value of 7.5×10 -14 cm 2 /s. Therefore, the charging/discharging rate performance of the LiMnPO4 can be improved by surface coating with the LiFePO4.

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Section: Introductionmentioning

confidence: 99%

Density functional theory study of lithium diffusion at the interface between olivine-type LiFePO₄and LiMnPO₄

Shi

Wang

2016

J. Phys. D: Appl. Phys.

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“…For example, even in the hydrothermal synthesis method [6] where the divalent iron precursor (FeSO 4 ) is used, in the absence of a reducing agent (ascorbic acid), LiFePO 4 with a Fe 3+ impurity is obtained. The obtained LiFePO 4 is significantly lower in electrochemical characteristics with respect to LiFePO 4 obtained by the same method in the presence of an inert atmosphere or reducing agent. In a neutral or alkaline medium, this material is insoluble.…”

Section: Introductionmentioning

confidence: 92%

“…In this case, the chemical reaction of LiFePO 4 oxidation can proceed either through a solid-phase mechanism (1) or with the dissolution of LiFePO 4 crystals. Dissolution occurs in acidic aqueous solutions (pH < 4), presumably due to the replacement of lithium ions in LiFePO 4 with hydrogen ions to form a soluble hydrogen phosphate. In particular, the ability of LiFePO 4 dissolution in acidic media helps to determine the mass fraction of carbon [3].…”

Section: Introductionmentioning

confidence: 99%

“…Determination of the degree of oxidation of LiFePO 4 cathode material is an urgent task, because this material is fairly active and can be easily oxidized from the surface during storage in an oxygen atmosphere. In addition, there are a number of synthesis methods where trivalent iron compounds are used as precursors [4,5], whereas in certain synthesis conditions, the presence of Li + and PO 4 3− ions should lead to LiFePO 4 formation. Controlling the iron oxidation state during synthesis is very important, because if Fe 3+ ions remain into the compound, they will decrease the mass of the active material (LiFePO 4 ) and will prevent reversible interaction/deintercalation of lithium ions during battery cycling.…”

Section: Introductionmentioning

confidence: 99%

“…The dissolution of LiFePO 4 in an acidic medium can be used to create an easy and fast method for determining the degree of oxidation of this material (w Fe 3+ = m(Fe 3+ ) m(Fe 2+ ) ). Determination of the degree of oxidation of LiFePO 4 cathode material is an urgent task, because this material is fairly active and can be easily oxidized from the surface during storage in an oxygen atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Methods for Determination of the Degree of Iron Oxidation in LiFePO4

et al. 2017

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Abstract:The disposal of LiFePO 4 (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.

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Design Principles for Sodium‐Ion Batteries

2022

Sodium‐Ion Batteries

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Kinetic analysis on LiFePO4 thin films by CV, GITT, and EIS

Cited by 489 publications

References 34 publications

Density functional theory study of lithium diffusion at the interface between olivine-type LiFePO₄and LiMnPO₄

Density functional theory study of lithium diffusion at the interface between olivine-type LiFePO₄and LiMnPO₄

Methods for Determination of the Degree of Iron Oxidation in LiFePO4

Design Principles for Sodium‐Ion Batteries

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Kinetic analysis on LiFePO4 thin films by CV, GITT, and EIS

Cited by 489 publications

References 34 publications

Density functional theory study of lithium diffusion at the interface between olivine-type LiFePO4and LiMnPO4

Density functional theory study of lithium diffusion at the interface between olivine-type LiFePO4and LiMnPO4

Methods for Determination of the Degree of Iron Oxidation in LiFePO4

Design Principles for Sodium‐Ion Batteries

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Density functional theory study of lithium diffusion at the interface between olivine-type LiFePO₄and LiMnPO₄

Density functional theory study of lithium diffusion at the interface between olivine-type LiFePO₄and LiMnPO₄