Kinetics of lithium deintercalation from LiFePO4

Safronov, Dmitry; Pinus, I. Yu.; Profatilova, I. A.; Tarnopol'skii, V. A.; Скундин, А. М.; Yaroslavtsev, A. B.

doi:10.1134/s0020168511030198

Cited by 18 publications

(11 citation statements)

References 12 publications

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“…Twophase regions are established during this process. Towards the end of discharge, the LiFePO4 particle is completely lithiated and regains its status of a single phase region [39][40][41][42]. However, the proposed model does not consider the phase change process that takes place within the electrode.…”

Section: Figure 1: Cylindrical Lfp Battery Geometrymentioning

confidence: 99%

A pseudo three-dimensional electrochemical-thermal model of a cylindrical LiFePO4/graphite battery

Chiew

Chin

Toh

et al. 2019

Applied Thermal Engineering

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This paper introduces a pseudo three-dimensional electrochemical-thermal coupled battery model for a cylindrical Lithium Iron Phosphate battery. The model comprises a pseudo two-dimensional electrochemical cell model coupled with three-dimensional lumped thermal model. The cell is disassembled to obtain the physical dimensions of the cell components. The thermal characteristics of the cell are studied during the discharge process over a range of temperatures and discharge rates. The validity of the numerical model is demonstrated experimentally via a 26650 cylindrical Lithium Iron Phosphate/graphite battery cylindrical cell.Instead of infrared thermal images, series of regression models are utilized to quantify the thermal behavior at various depth of discharge under various discharge rates. The results demonstrated that the battery cell performs differently at a lower ambient temperature and lower discharge rate where the exothermic reactions are milder.

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Section: Figure 1: Cylindrical Lfp Battery Geometrymentioning

confidence: 99%

A pseudo three-dimensional electrochemical-thermal model of a cylindrical LiFePO4/graphite battery

Chiew

Chin

Toh

et al. 2019

Applied Thermal Engineering

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“…The canonical phase-separating cathode material is LiFePO 4 , which exhibits low power in micronsized particles [10] but can achieve very high rates in nanoparticles [11]. Experimental measurements of the critical overpotential to initiate lithiation vary widely from 2 mV to 37 mV [12][13][14][15][16][17][18][19][20][21]. Size dependence has also been reported [12,21].…”

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confidence: 99%

Theory of Coherent Nucleation in Phase-Separating Nanoparticles

Cogswell

Bazant²

2013

Nano Lett.

151

233

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The basic physics of nucleation in solid single-crystal nanoparticles is revealed by a phase-field theory that includes surface energy, chemical reactions, and coherency strain. In contrast to binary fluids, which form arbitrary contact angles at surfaces, complete "wetting" by one phase is favored at binary solid surfaces. Nucleation occurs when surface wetting becomes unstable, as the chemical energy gain (scaling with area) overcomes the elastic energy penalty (scaling with volume). The nucleation barrier thus decreases with the area-to-volume ratio and vanishes below a critical size. Thus nanoparticles tend to transform in order of increasing size, leaving the smallest particles homogeneous (in the phase of lowest surface energy). The model is used to simulate phase separation in realistic nanoparticle geometries for LiXFePO4, a popular cathode material for Li-ion batteries, and collapses disparate experimental data for the nucleation barrier with no adjustable parameters. Beyond energy storage, the theory shows how to tailor the elastic and surface properties of a solid nanostructure to achieve desired phase behavior.

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“…In Figure 6 a higher magnification highlights the formation of very small particles with nanometric size. Actually, the formation of carbon on the active material surface can inhibit the particle grow ensuring a tiny granulometry and possibly can provide good conductibility and electric contact between particles [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28]. …”

Section: Resultsmentioning

confidence: 99%

“…So far, several materials, such as LiCoO 2 and LiMn 2 O 4 , have been used as cathode, but recently LiFePO 4 has attracted researchers’ interest due to its high specific energy, which may reach 580 Wh/kg, and relatively low production cost [9,10,11,12,13,14]. As a drawback, LiFePO 4 has low ionic diffusivity and conductibility [15,16,17], which limits its use as cathode. The electronic conductibility of LiFePO 4 can be enhanced by using several materials processing methods such as in situ carbon synthesis, or by particle coating with conductive carbons [18], or by an ion doping approach [19,20,21,22,23,24].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Electrochemical Behavior of LiMnxFe(1−x)PO4 Composites Obtained from Phenylphosphonate-Based Organic-Inorganic Hybrids

et al. 2017

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The synthesis of organic-inorganic hybrid compounds based on phenylphosphonate and their use as precursors to form LiMnxFe(1−x)PO4 composites containing carbonaceous substances with sub-micrometric morphology are presented. The experimental procedure includes the preliminary synthesis of Fe2+ and/or Mn2+ phenylphosphonates with the general formula Fe(1−x)Mnx[(C6H5PO3)(H2O)] (with 0 < x < 1), which are then mixed at different molar ratios with lithium carbonate. In this way the carbon, obtained from in situ partial oxidation of the precursor organic part, coats the LiMnxFe(1−x)PO4 particles. After a structural and morphological characterization, the electrochemical behavior of lithium iron manganese phosphates has been compared to the one of pristine LiFePO4 and LiMnPO4, in order to evaluate the doping influence on the material.

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Kinetics of lithium deintercalation from LiFePO4

Cited by 18 publications

References 12 publications

A pseudo three-dimensional electrochemical-thermal model of a cylindrical LiFePO4/graphite battery

A pseudo three-dimensional electrochemical-thermal model of a cylindrical LiFePO4/graphite battery

Theory of Coherent Nucleation in Phase-Separating Nanoparticles

Synthesis, Characterization, and Electrochemical Behavior of LiMnxFe(1−x)PO4 Composites Obtained from Phenylphosphonate-Based Organic-Inorganic Hybrids

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