Effect of Surface Carbon Structure on the Electrochemical Performance of LiFePO[sub 4]

Doeff, Marca M.; Hu, Yaoqin; McLarnon, Frank; Kostecki, Robert

doi:10.1149/1.1601372

Cited by 485 publications

(310 citation statements)

References 14 publications

(8 reference statements)

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“…We have previously noted a correlation between the structure of carbon in LiFePO 4 samples and the utilization upon discharge in lithium cells at room temperature [9]. Significantly, some materials with low amounts of carbon and low D/G ratios outperformed those with more carbon having a more disordered structure.…”

Section: Introductionmentioning

confidence: 91%

Optimization of carbon coatings on LiFePO4

Doeff

Wilcox

Kostecki

et al. 2006

Journal of Power Sources

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227

138

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The electrochemical performance of LiFePO 4 in lithium cells is strongly dependent on the structure (disordered/graphene or D/G ratio) of the in situ carbon produced during synthesis from carbon-containing precursors. Addition of pyromellitic acid (PA) prior to final calcination results in lower D/G ratios, yielding a higher-rate material. Further improvements in electrochemical performance are realized when graphitization catalysts such as ferrocene are also added during LiFePO 4 preparation, although overall carbon content is still less than 2 wt. %.

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Section: Introductionmentioning

confidence: 91%

Optimization of carbon coatings on LiFePO4

Doeff

Wilcox

Kostecki

et al. 2006

Journal of Power Sources

Self Cite

227

138

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“…This hypothesis must be released where the number n of magnetic clusters is so large that magnetic interactions between the ferrimagnetic particles become important [9]. At high fields, M extrin saturates to Nnµ so that this quantity is readily determined as the ordinate at H = 0 of the intersection of the tangent to the magnetization curves at large fields.…”

Section: Iron(iii) Nanoclusters In Lifepomentioning

confidence: 99%

“…Various types of iron-based impurities have been identified in the olivine framework: for examples γ-Fe 2 O 3 , Fe 3 O 4 , Li 3 Fe 2 (PO 4 ) 3 , Fe 2 P 2 O 7 , Fe 2 P, Fe 3 P, Fe 75 P 15 C 10 , etc. Critical quality control of the product is necessary to obtain a complete understanding of synthesis conditions using combination of experiments such as Raman spectroscopy and magnetic measurements [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Properties of LiFePO<sub>4</sub> as Positive Electrode of Li-Ion Batteries for HEV Application

Julien¹,

Zaghib²,

Mauger³

et al. 2012

ACES

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LiFePO 4 materials synthesized using FePO 4 (H 2 O) 2 and Li 2 CO 3 blend were optimized in view of their use as positive electrodes in Li-ion batteries for hybrid electric vehicles. A strict control of the structural properties was made by the combination of X-ray diffraction, FT-infrared spectroscopy and magnetometry. The impact of the ferromagnetic clusters (γ-Fe 2 O 3 or Fe 2 P) on the electrochemical response was examined. The electrochemical performances of the optimized LiFePO 4 powders investigated at 60˚C are excellent in terms of capacity retention (153 mAh·g -1 at 2C) as well as in terms of cycling life. No iron dissolution was observed after 200 charge-discharge cycles at 60˚C for cells containing Li foil, Li 4 Ti 5 O 12 , or graphite as negative electrodes.

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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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Effect of Surface Carbon Structure on the Electrochemical Performance of LiFePO[sub 4]

Cited by 485 publications

References 14 publications

Optimization of carbon coatings on LiFePO4

Optimization of carbon coatings on LiFePO4

Enhanced Electrochemical Properties of LiFePO<sub>4</sub> as Positive Electrode of Li-Ion Batteries for HEV Application

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

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Effect of Surface Carbon Structure on the Electrochemical Performance of LiFePO[sub 4]

Cited by 485 publications

References 14 publications

Optimization of carbon coatings on LiFePO4

Optimization of carbon coatings on LiFePO4

Enhanced Electrochemical Properties of LiFePO&lt;sub&gt;4&lt;/sub&gt; as Positive Electrode of Li-Ion Batteries for HEV Application

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

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Enhanced Electrochemical Properties of LiFePO<sub>4</sub> as Positive Electrode of Li-Ion Batteries for HEV Application

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