Abstract
This study focuses on the effect of addition of surfactant as a dispersing agent during vibratory ball milling of LiFePO4 (LFP) precursor materials on the electrochemical performance of solid-state reaction synthesized LFP for lithium-ion battery cathode material. LFP particles formed after calcinations of ball milled LFP precursors (Li2CO3, FeC2O4, and NH4H2PO4) showed better size uniformity, morphology control, and reduced particle size when anionic surfactant (Avanel S-150) was used. The specific surface area of LFP particles increased by approximately twofold on addition of surfactant during milling. These particles showed significantly enhanced cyclic performance during charge/discharge due to a reduced polarization of electrode material. Electrodes fabricated from LFP particles by conventional milling process showed a 22 % decrease in capacity after 50 cycles, whereas the performance of electrode prepared by surfactant processed LFP showed only 3 % loss in capacity. The LFP particles were characterized using XRD, FE-SEM, particle size distribution, density measurement, and BET-specific surface area measurement. Electrochemical impedance spectra and galvanostatic charge/discharge test were performed for the electrochemical performance using coin-type cell.
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The authors thank Dr. Meng’s group for providing electrochemical test instrument used in this study.
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Lee, J., Kumar, P., Lee, G. et al. Electrochemical performance of surfactant-processed LiFePO4 as a cathode material for lithium-ion rechargeable batteries. Ionics 19, 371–378 (2013). https://doi.org/10.1007/s11581-012-0830-9
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DOI: https://doi.org/10.1007/s11581-012-0830-9