Electrical conductivity and reaction with lithium of LiFe1−yMnyPO4 olivine-type cathode materials

Molenda, Janina; Ojczyk, W.; Marzec, J.

doi:10.1016/j.jpowsour.2007.06.238

Cited by 115 publications

(55 citation statements)

References 13 publications

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“…Indeed, the extraction and insertion of Li proceed at two steps at 3.4 and 4.1 V, as the iron ions are reduced before the manganese ions [63][64][65]. Since then, carbon-coated LiMn x Fe 1−x PO 4 has been prepared successfully by different techniques [66][67][68][69][70][71], and the electrochemical properties are now well known. The electrochemical properties strongly decrease at x≥0.8 [68].…”

Section: Trends In the Research On The Olivine Familymentioning

confidence: 99%

Overview of olivines in lithium batteries for green transportation and energy storage

Zaghib

Mauger

Julien

2012

J Solid State Electrochem

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We present the progress on the physical chemistry of the olivine compounds since the pioneering work of Prof. John Goodenough. This progress has allowed LiFePO 4 to become the active cathode element of a new generation of Li-ion batteries that makes a breakthrough in the technology of the energy storage and electric transportation. This achievement is the fruit of about a decade of intensive research in the electrochemical community during which chemists, electrochemists, and physicists added there efforts to understand the properties of the material, to overcome the obstacles that were met on the way, and finally to reach the state of the art that allows its commercial use for worldwide applications in the industry today. These obstacles involved carbon coating, purification, control of the surface, the progressive decrease of the size of the particles down to nanoscale, and comprehensive investigation of surface effects. Nevertheless, heterogeneity in the quality of the product available on the market is damaging and may even be an obstacle to the development of new demanding technologies such as electric transportation. Emphasis is placed on the quality control that is needed to guarantee the reliability and the optimum electrochemical performance of this material as the active cathode element of Li-ion batteries. The route to increase the performance of Li-ion batteries with the other members of the family is also discussed. Since Prof. John Goodenough not only initiated the work but also played a major role in the research and development on these materials through the years, the present review is dedicated to him.

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Section: Trends In the Research On The Olivine Familymentioning

confidence: 99%

Overview of olivines in lithium batteries for green transportation and energy storage

Zaghib

Mauger

Julien

2012

J Solid State Electrochem

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“…It can be observed that there is a remarkable decrease in R ct after the Fe substitution. The charge transfer resistance is associated with complex reaction process of charge transfer between the electrolyte and the active materials [27,28]. As we know, doping is often considered as an effective way to increase electronic conductivity.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization, and electrochemical properties of Li2Mn1-x Fe x (PO3)4 cathode material for lithium-ion batteries

Yan

Zhao

Dong

et al. 2015

J Solid State Electrochem

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Li 2 Mn 1-x Fe x (PO 3 ) 4 (x=0, 0.2, 0.4, 0.6, 0.7) solid solution phase has been successfully prepared via solid-state reaction. The Rietveld refinement results indicate that the Li 2 Mn 1-x Fe x (PO 3 ) 4 (x=0, 0.2, 0.4, 0.6, 0.7) solid solutions with orthorhombic structure can be obtained and the lattice parameters (including a, b, c, and V) decrease with the increasing of Fe concentration. Partial substitution of manganese with iron enhances the electrochemical performance; there, the discharge-specific capacity of the samples obviously increases from 21 mAh/g for x=0 to 59 mAh/g for x=0.7, which is 85 % capacity of that one lithium removal. The cyclic voltammetric (CV) curves present the Mn 2+ /Mn 3+ redox couple situated at 4.6 and 1.8 V and Fe 2+ /Fe 3+ redox couple located at 4.3 and 2.3 V, which can be observed in cathodic and anodic sweeps. Such a low discharge potential value for M 2+ / M 3+ redox couple may be attributed to the zigzag [(PO 3 ) 1− ] n chains in this structure.

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“…A constant phase element CPE was placed to represent the double layer capacitance and passivation film capacitance. The R ct of LFPF-1 and LFPF-2, which is related to complex reaction process of charge transfer between the electrolyte and the active materials, 11,12 are 240 Ω and 350 Ω, respectively. Therefore, the electrode composed of LFPF-1 exhibits a little more feasible Li + diffusion and electron transfer.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study and Electrochemical Properties of LiFePO₄F Synthesized by Different Routes

Huang¹,

Liu²,

Li³

et al. 2012

Bulletin of the Korean Chemical Society

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To improve the performance of LiFePO 4 F, a novel sol-gel process is developed. For comparison, ceramic process is also implemented. From X-ray diffraction results we know that each sample adopts a triclinic P1 space group, and they are isostructural with amblygonite and tavorite. The scanning electron microscope images show that the homogeneous grains with the dimension of 300-500 nm is obtained by the sol-gel process; meanwhile the sample particles obtained by ceramic process are as big as 1000-3000 nm. By galvanostatic tests and at electrochemical impedance spectroscopy method, the sample obtained by sol-gel process presents better electrochemical properties than the one obtained by ceramic process.

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Electrical conductivity and reaction with lithium of LiFe1−yMnyPO4 olivine-type cathode materials

Cited by 115 publications

References 13 publications

Overview of olivines in lithium batteries for green transportation and energy storage

Overview of olivines in lithium batteries for green transportation and energy storage

Synthesis, characterization, and electrochemical properties of Li2Mn1-x Fe x (PO3)4 cathode material for lithium-ion batteries

Comparative Study and Electrochemical Properties of LiFePO₄F Synthesized by Different Routes

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Electrical conductivity and reaction with lithium of LiFe1−yMnyPO4 olivine-type cathode materials

Cited by 115 publications

References 13 publications

Overview of olivines in lithium batteries for green transportation and energy storage

Overview of olivines in lithium batteries for green transportation and energy storage

Synthesis, characterization, and electrochemical properties of Li2Mn1-x Fe x (PO3)4 cathode material for lithium-ion batteries

Comparative Study and Electrochemical Properties of LiFePO4F Synthesized by Different Routes

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Comparative Study and Electrochemical Properties of LiFePO₄F Synthesized by Different Routes