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以FeSO4·7H2O、NH4H2PO4和H2O2为初始原料,通过液相沉淀法制得前驱体FePO4,然后通过碳热还原制得LiFePO4。我们采用两种加碳方式:a、先制得FePO4,然后加炭黑混合高温合成LiFePO4;b、先把炭黑分散在液相中,然后通过液相沉淀制得含碳的FePO4,再高温合成LiFePO4。SEM(扫描电子显微镜)分析表明:方法b制备的FePO4颗粒比方法a制备的FePO4颗粒细小。在其它条件相同的情况下方法b合成的LiFePO4的电化学性能要优于方法a合成的电化学性能。采用方法b于560℃煅烧12h制备的LiFePO4在0.1C放电倍率下其比容量为149mAh/g,而当放电倍率达到1C时,放电比容量为124mAh/g,且具有良好的循环性能。 相似文献
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Grainy electrolytic manganese dioxide was prepared by electrodeposition in a 0.9 mol/L MnSO4 and 2.5 mol/L H2SO4 solution. The structure, particle size and appearance of the grainy electrolytic manganese dioxide were determined by powder X-ray diffraction, laser particle size analysis and scanning electron micrographs measurements. Current density has important effects on cell voltage, anodic current efficiency and particle size of the grainy electrolytic manganese dioxide, and the optimum current density is 30 A/dm^2. The grainy electrolytic manganese dioxide electrodeposited under the optimum conditions consists of γ-MnO2 with an orthorhombic lattice structure; the grainy electrolytic manganese dioxide has a spherical or sphere-like appearance and a narrow particle size distribution with an average particle diameter of 7. 237μm. 相似文献
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沉淀-碳热还原联合法制备橄榄石磷酸铁锂 总被引:5,自引:1,他引:5
以FeSO4.7H2O,NH4H2PO4和H2O2为初始原料,通过液相沉淀制得前驱体FePO4,然后通过碳热还原得到LiFePO4/C。X射线衍射和扫描电镜分析表明:560,600,700和800℃合成的样品均为LiFePO4/C,LiFePO4颗粒粒径随合成温度的升高而逐渐增大,560℃合成材料的颗粒粒径分布在0.3~0.4μm之间;而800℃合成材料的颗粒粒径则达到0.6~0.7μm,反应剩余的碳黑直接分布在LiFePO4颗粒之间,有利于提高其电子导电率。560℃样品在放电倍率为0.1C时的首次放电比容量为151 mA.h/g(0.1C),而当放电倍率达到1C时,放电比容量为129 mA.h/g,且具有良好的循环性能。 相似文献
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