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Iron phosphate

About: Iron phosphate is a research topic. Over the lifetime, 1830 publications have been published within this topic receiving 25963 citations.


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Journal ArticleDOI
22 May 2009-Science
TL;DR: A genetically modified virus is used to form an efficient cathodic battery material and this environmentally benign low-temperature biological scaffold could facilitate fabrication of electrodes from materials previously excluded because of extremely low electronic conductivity.
Abstract: Development of materials that deliver more energy at high rates is important for high-power applications, including portable electronic devices and hybrid electric vehicles. For lithium-ion (Li+) batteries, reducing material dimensions can boost Li+ ion and electron transfer in nanostructured electrodes. By manipulating two genes, we equipped viruses with peptide groups having affinity for single-walled carbon nanotubes (SWNTs) on one end and peptides capable of nucleating amorphous iron phosphate(a-FePO4) fused to the viral major coat protein. The virus clone with the greatest affinity toward SWNTs enabled power performance of a-FePO4 comparable to that of crystalline lithium iron phosphate (c-LiFePO4) and showed excellent capacity retention upon cycling at 1C. This environmentally benign low-temperature biological scaffold could facilitate fabrication of electrodes from materials previously excluded because of extremely low electronic conductivity.

724 citations

Journal ArticleDOI
TL;DR: In this paper, a mathematical model for lithium intercalation and phase change in an iron phosphate-based lithium-ion cell was developed to understand the cause for the low power capability of the material.
Abstract: This paper develops a mathematical model for lithium intercalation and phase change in an iron phosphate-based lithium-ion cell in order to understand the cause for the low power capability of the material. The juxtaposition of the two phases is assumed to be in the form of a shrinking core, where a shell of one phase covers a core of the second phase. Diffusion of lithium through the shell and the movement of the phase interface are described and incorporated into a porous electrode model consisting of two different particle sizes. Open-circuit measurements are used to estimate the composition ranges of the single-phase region. Model-experimental comparisons under constant current show that ohmic drops in the matrix phase, contact resistances between the current collector and the porous matrix, and transport limitations in the iron phosphate particle limit the power capability of the cells. Various design options, consisting of decreasing the ohmic drops, using smaller particles, and substituting the liquid electrolyte by a gel are explored, and their relative importance discussed. The model developed in this paper can be used as a means of optimizing the cell design to suit a particular application.

708 citations

Journal ArticleDOI
01 Mar 1990-Langmuir
TL;DR: In this paper, the authors used CIR-FTIR, adsorption isotherm, and electrophoretic mobility data to calculate the intrinsic pK value (4.6) for the bridging bidentate iron phosphate surface complex.
Abstract: CIR-FTIR in situ spectroscopic studies have provided evidence for the formation of three different type of complexes, protonated and nonprotonated bridging bidentate as well as a nonprotonated monodentate, between orthophosphate ions and surface Fe(III) of {alpha}-FeOOH particles in aqueous suspensions. The speciation of these complexes is a function of pH and phosphate surface coverage ({Lambda}). Furthermore, the combination of CIR-FTIR, adsorption isotherm, and electrophoretic mobility data allows them to calculate the intrinsic pK value (4.6) for the bridging bidentate iron phosphate surface complex.

484 citations

Journal ArticleDOI
TL;DR: In this paper, phase pure, homogeneous, and well-crystallized lithium iron phosphate LiFePO4 was synthesized by aqueous co-precipitation of an Fe(II) precursor material and succeeding heat treatment in nitrogen.

398 citations

Journal ArticleDOI
TL;DR: LiFePO4 is a potential cathode candidate for the next generation of secondary lithium batteries and its reactivity and thermodynamic stability have been determined in this paper, where the fully charged state, orthorhombic FePO4, is metastable relative to the trigonal all tetrahedral form, but the massive structural rearrangement necessary makes the structural change kinetically unfavorable at room temperature.

344 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202323
202240
202143
2020108
2019146
2018150