Mr. Alfredo A. Martinez-Morales Profile

Alfredo A. Martinez-Morales

at Univ of California Riverside

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Proceedings Article | 18 May 2017 Paper

The effects of ionic liquid to water ration as a composite medium for the synthesis of LiFePO4

Rany Tith, Jaydeep Dutta, Kichang Jung, Alfredo Martinez-Morales

Proceedings Volume 10194, 101942Y (2017) https://doi.org/10.1117/12.2268739

KEYWORDS: Liquids, Crystals, Composites, Scanning electron microscopy, X-ray diffraction, Liquid crystals, Lithium, Optical transfer functions, Solid state physics, Crystallography

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LiFePO₄ is a highly researched cathode material that serves as an alternative material for traditional commercial lithiumion batteries such as LiCoO₂. Currently, there are a number of different methods to synthesize LiFePO₄ including: hydrothermal, solid state, spray pyrolysis, and coprecipitation. Our proposed method has the potential to provide an ecologically friendly and economically competitive way to synthesize LiFePO₄ by utilizing ionic liquid and water, as a composite synthesis medium. The addition of water to ionic liquid can be beneficial as it can act as a mineralizer to bring insoluble precursors to form LiFePO₄ seed crystals. Furthermore, this method provides the possibility of recycling the ionic liquid for repeated synthesis processes. In this work, we study the effects of ionic liquid to water ratio on the crystallinity and morphology of the synthesized material. Our group was able to conclude a reaction medium utilizing a ratio of equal parts of 1-ethyl-3-methyl imidazolium trifluoromethane sulfonate (EMIM Otf) and water, or a slightly favored ionic liquid ratio, increases the efficacy of the synthesis route. Crystallinity and purity was determined by X-ray diffraction (XRD), scanning electron microscopy (SEM) was used to determine morphology and crystal sizes, and energy dispersion spectroscopy (EDX) was used for elemental analysis.

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