Presentation Title

Time Dependent Study on Ionic Liquid/Water Composite Synthesis of LiFePO4

Start Date

November 2016

End Date

November 2016

Location

MSE 011

Type of Presentation

Oral Talk

Abstract

Lithium iron phosphate (LiFePO4) is a widely used material for lithium ion batteries, due to its stability and lower toxicity compared to other commonly used cathode materials (i.e. LiCoO2). This has resulted in a large number of developed methods to synthesize LiFePO4, including: hydrothermal, solid state, spray pyrolysis, and coprecipitation. Although LiFePO4 is known to be an environmentally friendlier material, many of the methods by which it’s synthesized are not as ecologically benign. Energy intensive methods such as solid state synthesis require high temperatures to completely synthesize the material. At an attempt to create a more sustainable synthesis process, we propose a method in which an ionic liquid in combination with water is used as the synthesis medium. This opens up the possibility of recycling and reusing the ionic liquid for subsequent synthesis.

In this work, we demonstrate a method involving ionic liquid (1-ethyl-3-methylimidazolium trifluoromethanesulfonate) and grade 1 purified water (ISO 3696) composite medium. With the use of ionic liquid lies the possibility of a reusable medium that can be recycled after each synthesis. It is known from the experimental results that certain precursors have poor solubility in ionic liquids. To overcome such a problem, our approach utilizes a hybrid medium to improve solubility, providing a partially reusable synthesis medium.

To optimize against impurities, a time dependent study on the synthesis of LiFePO4 using the composite medium was carried out. Scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), and x-ray diffraction (XRD) analysis were done on different samples to investigate morphology, crystallinity, and purity of the as-synthesized material.

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Nov 12th, 3:00 PM Nov 12th, 3:15 PM

Time Dependent Study on Ionic Liquid/Water Composite Synthesis of LiFePO4

MSE 011

Lithium iron phosphate (LiFePO4) is a widely used material for lithium ion batteries, due to its stability and lower toxicity compared to other commonly used cathode materials (i.e. LiCoO2). This has resulted in a large number of developed methods to synthesize LiFePO4, including: hydrothermal, solid state, spray pyrolysis, and coprecipitation. Although LiFePO4 is known to be an environmentally friendlier material, many of the methods by which it’s synthesized are not as ecologically benign. Energy intensive methods such as solid state synthesis require high temperatures to completely synthesize the material. At an attempt to create a more sustainable synthesis process, we propose a method in which an ionic liquid in combination with water is used as the synthesis medium. This opens up the possibility of recycling and reusing the ionic liquid for subsequent synthesis.

In this work, we demonstrate a method involving ionic liquid (1-ethyl-3-methylimidazolium trifluoromethanesulfonate) and grade 1 purified water (ISO 3696) composite medium. With the use of ionic liquid lies the possibility of a reusable medium that can be recycled after each synthesis. It is known from the experimental results that certain precursors have poor solubility in ionic liquids. To overcome such a problem, our approach utilizes a hybrid medium to improve solubility, providing a partially reusable synthesis medium.

To optimize against impurities, a time dependent study on the synthesis of LiFePO4 using the composite medium was carried out. Scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), and x-ray diffraction (XRD) analysis were done on different samples to investigate morphology, crystallinity, and purity of the as-synthesized material.