Control of the LiFePO4 electrochemical properties using low-cost iron precursor in a melt process

Talebi‐Esfandarani, Majid; Rousselot, Steeve; Gauthier, Michel; Sauriol, Pierre; Duttine, Mathieu; Wattiaux, Alain; Liu, Yulong; Sun, Andy; Liang, Guoxian; Dollé, Michael

doi:10.1007/s10008-016-3324-2

Cited by 20 publications

(22 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, no dopant is expected in the LFP structure of IOC‐0.94. This is made possible via a control of the composition of the molten bath during synthesis . In IOC‐1.00, on the basis solely of XRD, it is not clear whether all Si, along with other elements, is inserted in the LiFePO 4 structure or not.…”

Section: Resultsmentioning

confidence: 93%

“…This can be considered as an indication of a change in the location of Si in LFP (from an impurity SiO 2 base phase to a dopant in LFP structure). This confirms previous results based on XRD coupled with pattern matching refinement performed by our group on the location of Si in LFP materials within the LFP structure or as an impurity phase …”

Section: Resultsmentioning

confidence: 99%

“…Small amounts of secondary phases Li 3 PO 4 or Li 4 P 2 O 7 are detected as well for all the samples. These impurities are commonly reported in molten synthesized LFP samples regardless of the composition . In Figure a, focus is brought on the IOC‐1.00 and IOC‐0.94 samples.…”

Section: Resultsmentioning

confidence: 99%

“…The LFP samples were prepared using a melt‐synthesis process. Details regarding this procedure have been described elsewhere …”

Section: Methodsmentioning

confidence: 99%

“…Various synthesis procedures have been studied for the synthesis of pristine and doped LFP, including solid state, sol‐gel, hydrothermal, microwave, atomic layer deposition, and melt‐synthesis methods . Depending on the synthesis method, different impurities are formed alongside the LFP structure, which have a significant effect on the overall performance of synthesized material.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Chemical speciation and mapping of the Si in Si doped LFP ingot with synchrotron radiation technique

Banis¹,

Wang²,

Rousselot

et al. 2019

Can J Chem Eng

View full text Add to dashboard Cite

Development of LiFePO 4 cathode material with high cycle life through Si doping (substituting Si at P sites of LiFePO 4 ) has shown that small changes to the structure of LiFePO 4 can significantly affect the performance of Li ion batteries. However, determining the nature of elemental doping and their effects on the electronic and atomic structure of LiFePO 4 remains challenging. Here we present x-ray absorption spectroscopy and x-ray fluorescence mapping as ideal characterization methods for understanding the effect of Si doped LiFePO 4 prepared using a melt-synthesis process.x-ray absorption spectra of silicon doped LiFePO 4 indicate subtle changes in the local structure surrounding the dopants compared to SiO 2 and amorphous glass phases formed as impurities in Si containing undoped samples. The study of Fe and P K-edges x-ray absorption spectra illustrates the effect of Si in the LiFePO 4 structure in doped and impurity containing samples. Utilizing x-ray absorption spectroscopy, in conjunction with x-ray fluorescence mapping, has enabled a better overview of the non-uniform nature of prepared ingot samples. These results highlight the power of x-ray absorption spectroscopy as a tool for better understanding the structure of modified LiFePO 4 and subsequently designing materials for Li ion batteries.

show abstract

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The LFP samples were prepared using a melt‐synthesis process. Details regarding this procedure have been described elsewhere …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Chemical speciation and mapping of the Si in Si doped LFP ingot with synchrotron radiation technique

Banis¹,

Wang²,

Rousselot

et al. 2019

Can J Chem Eng

View full text Add to dashboard Cite

show abstract

Melt‐synthesis of LiFePO₄ over a metallic bath

et al. 2019

View full text Add to dashboard Cite

Compared with large-scale processes, the LiFePO 4 (LFP) melt-synthesis is a low-cost method with short dwell times and rapid reaction rates. However, secondary phases and impurities remaining in the olivine structure lower the cathode's electrochemical properties. Starting from a lowcost Fe 3þ precursor, we evaluated tin and silver charged metallic baths to purify the melt-synthesis of LiFePO 4 at laboratory scale. In the tin bath exploration, an x-ray diffraction (XRD) confirmed the olivine structure and a temperature-dependent generation of Li 3 PO 4 and Li 4 P 2 O 7 . An SEM image analysis identified tin-rich phases (Sn x P y O z ) segregated from the LFP structure and Fe x P phases on the internal walls of the crucible. A multielement analysis (ICP-AES) detected more than 0.03 g of Sn/g of LFP. The tin bath prepared samples delivered up to156 mAh/g of LFP in a carbonfree basis, 3 % lower than the capacity of the high purity Fe 2 O 3 -based material at 0.1 C. The silver bath-based LFP samples produced cleaner XRD patterns (less than 160 ppm of Ag in the LFP ingots), closer to the estimated molar ratios and neither silver compounds nor silver oxides. In this case, the sample delivered 161 mAh/g of LFP, the same capacity as the cathode prepared without a metallic bath. Starting from a commodity Fe 3þ source, future work should explore the silver bath roles as a reactive media, a heating source, a crucible insulator, and a potential contaminant trap for the melt-synthesis of LiFePO 4 .

show abstract

Piloting melt synthesis and manufacturing processes to produce c‐lifepo₄: preface

et al. 2019

View full text Add to dashboard Cite

Since Goodenough's team laid the foundation to apply LiFePO 4 as an alternative to lithium cobalt oxide for Li-ion positive electrodes, [1,2] Web of Science (WoS) [3] has indexed over 6000 articles related to lithium iron phosphate-LFP. Manufacturers synthesize LFP with both solid state and solvent assisted hydrothermal technology. Both have their advantages and disadvantages but society requires inexpensive batteries for automobile applications and fixed electrical storage. Here we scale up each step of the nascent melt synthesis process, which has the potential to displace the current commercial technology because of its superior economics related to raw materials. The research challenges include raw material selection, melt synthesis conditions, thermodynamics, micronization to form nano-powders, followed by spray drying, and carbon coating.

show abstract

Control of the LiFePO4 electrochemical properties using low-cost iron precursor in a melt process

Cited by 20 publications

References 42 publications

Chemical speciation and mapping of the Si in Si doped LFP ingot with synchrotron radiation technique

Chemical speciation and mapping of the Si in Si doped LFP ingot with synchrotron radiation technique

Melt‐synthesis of LiFePO₄ over a metallic bath

Piloting melt synthesis and manufacturing processes to produce c‐lifepo₄: preface

Contact Info

Product

Resources

About

Control of the LiFePO4 electrochemical properties using low-cost iron precursor in a melt process

Cited by 20 publications

References 42 publications

Chemical speciation and mapping of the Si in Si doped LFP ingot with synchrotron radiation technique

Chemical speciation and mapping of the Si in Si doped LFP ingot with synchrotron radiation technique

Melt‐synthesis of LiFePO4 over a metallic bath

Piloting melt synthesis and manufacturing processes to produce c‐lifepo4: preface

Contact Info

Product

Resources

About

Melt‐synthesis of LiFePO₄ over a metallic bath

Piloting melt synthesis and manufacturing processes to produce c‐lifepo₄: preface