在这项研究中,使用五种不同的碳源通过一步溶胶-凝胶法合成了LiFePO4/C复合颗粒。还使用溶胶-凝胶法合成了La掺杂的LiFePO4。LixLayFePO4(x=0.9~1.0,y=0~0.1)在700℃煅烧10h后的XRD图谱表明,随着掺杂比的增加,样品的细胞体积先增加后减少,达到最大值293.36µ3(x=0.94,y=0.06)。Li0.92La0.08FePO4在不同温度下煅烧10h后的XRD图谱表明,随着煅烧温度的升高,(311)衍射峰向较小的衍射角漂移。同样,Li0.92La0.08FePO4在700°C下煅烧不同持续时间后的XRD图谱表明,随着煅烧时间的增加,(311)衍射峰向较大的衍射角漂移。在700°C煅烧10h后,LixLayFePO4(x=0.9〜1.0,y=0〜0.1)的红外光谱图显示出对应于Li-O键和PO43-基团振动的吸收峰。在700°C煅烧10小时后,对LixLayFePO4(x=1,y=0;x=0.96,y=0.04;x=0.92,y=0.08)的SEM分析表明,颗粒形状不规则,尺寸均匀。Li0.92La0.08FePO4在600°C煅烧后的磁滞回线,700°C,或800°C持续10小时表明,随着煅烧温度的升高,女士逐渐增加,而先生和Hc下降,最小值为0.08emu/g和58.21Oe,分别。在700°C下煅烧10小时后,LixLayFePO4(x=1,y=0;x=0.96,y=0.04;x=0.92,y=0.08)的Mössbauer光谱表明所有样品均含有Doublet(1)和Doublet(2)峰,以Fe2+化合物为主。Fe2+的比例为85.5%(x=1,y=0),89.9%(x=0.96,y=0.04),和96.0%(x=0.92,y=0.08)。三个样品的双体(1)的最大IS和QS分别为1.224mm/s和2.956mm/s,分别。
In this study LiFePO4/C composite particles were synthesized using five different carbon sources via a one-step sol-gel method. La-doped LiFePO4 was also synthesized using the sol-gel method. The XRD pattern of LixLayFePO4 (x = 0.9~1.0, y = 0~0.1) after being calcined at 700 °C for 10 h indicates that as the doping ratio increased, the sample\'s cell volume first increased then decreased, reaching a maximum value of 293.36 Å3 (x = 0.94, y = 0.06). The XRD patterns of Li0.92La0.08FePO4 after being calcined at different temperatures for 10 h indicate that with increasing calcination temperature, the (311) diffraction peak drifted toward a smaller diffraction angle. Similarly, the XRD patterns of Li0.92La0.08FePO4 after being calcined at 700 °C for different durations indicate that with increasing calcination times, the (311) diffraction peak drifted toward a larger diffraction angle. The infrared spectrum pattern of LixLayFePO4 (x = 0.9~1.0, y = 0~0.1) after being calcined at 700 °C for 10 h shows absorption peaks corresponding to the vibrations of the Li-O bond and PO43- group. An SEM analysis of LixLayFePO4 (x = 1, y = 0; x = 0.96, y = 0.04; x = 0.92, y = 0.08) after being calcined at 700 °C for 10 h indicates that the particles were irregular in shape and of uniform size. The hysteresis loops of Li0.92La0.08FePO4 after being calcined at 600 °C, 700 °C, or 800 °C for 10 h indicate that with increasing calcination temperature, the Ms gradually increased, while the Mr and Hc decreased, with minimum values of 0.08 emu/g and 58.21 Oe, respectively. The Mössbauer spectra of LixLayFePO4 (x = 1, y = 0; x = 0.96, y = 0.04; x = 0.92, y = 0.08) after being calcined at 700 °C for 10 h indicate that all samples contained Doublet(1) and Doublet(2) peaks, dominated by Fe2+ compounds. The proportions of Fe2+ were 85.5% (x = 1, y = 0), 89.9% (x = 0.96, y = 0.04), and 96.0% (x = 0.92, y = 0.08). The maximum IS and QS of Doublet(1) for the three samples were 1.224 mm/s and 2.956 mm/s, respectively.