【摘 要】
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In this study,the LiFePO4 cathode was syn-thesized by the ionic thermal method using the deep eutectic mixture of tetramethyl ammonium chloride and urea.The synthetic conditions were systematically inves-tigated by orthogonal experiments,which indicate th
【机 构】
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School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;School of
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In this study,the LiFePO4 cathode was syn-thesized by the ionic thermal method using the deep eutectic mixture of tetramethyl ammonium chloride and urea.The synthetic conditions were systematically inves-tigated by orthogonal experiments,which indicate that the optimal reaction time,reaction temperature,molar ratio of Li to DES and rotate speed are 96 h,220 ℃,1∶14 and 20 r·min-1,respectively.X-ray diffraction (XRD),scan-ning electron microscope (SEM) and transmission electron microscope (TEM) were characterized to investigate the crystalline structure and morphology of the obtained materials,indicating well-crystallized LiFePO4 with oli-vine structure.And the physical properties of LiFePO4 were explored through Fourier transform infrared spec-troscopy (FTIR),57Fe M(o)ssbauer absorption spectra and Raman spectra.An initial discharge capacity can reach 151 mAh·g-1 at 0.1C rate for LiFePO4 following by calcining at 600 ℃ under the optimal conditions,and it retains 125.1 mAh·g 1 after 100 cycles.These results demon-strated that the addition of ionic liquids can improve the rate performance,cycle performance and ion diffusion rate of LiFePO4.
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