A three-dimensional lithium iron phosphate (LPF) was synthesized in alcoholic-based approach for making cathode material used in lithium battery. The crystal phase, crystallinity and grain size of LFP can be controlled with different pH values through various lithium hydroxide monohydrate (LiOH．H<sub>2</sub>O) molar ratio via co-precipitation method. Glucose was used as carbon source to form a carbon layer (LFP/C) coating on LFP. The electrochemical characterization of LFP/C was tested in CR2032 type coin cell. The chemical behavior of LFP with four pH values was further illustrated which demonstrated the important role of surface chemistries in changing the chemical properties of nanocrystals. The results showed the charge/discharge capacity of LFP/C cathode material could be enhanced effectivity as pH of 7.8. Moreover, its resistance was the lowest and the lithium ion intercalation/deintercalation mechanism rate was the highest by cyclic voltammetry test. The microstructures of LFP were observed by X-ray Diffraction, Scanning Electron Microscope (SEM), Energy Dispersive Spectrometer, Fourier-Transform Infrared spectroscopy and Elemental Analysis. The result of SEM showed the particle size can reach the nanometer level with appropriate pH value and thus improve the charge/discharge performance.

Effects of pH in operating solution on the electrochemical performance of LiFePO<sub>4</sub> cathode material coated with carbon

256th National Meeting (2018)

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Effects of pH in operating solution on the electrochemical performance of LiFePO4 cathode material coated with carbon

Effects of pH in operating solution on the electrochemical performance of LiFePO₄ cathode material coated with carbon