Method for preparing iron phosphate material with composite structure

一种复合结构磷酸铁材料的制备方法

Abstract

The invention discloses a method for preparing an iron phosphate material with composite structure. The method comprises the following steps of: preparing a solution of iron phosphate with molar concentration of between 0.1 and 10M by dissolving solid iron phosphate in nitric acid with a mass concentration of between 1 and 20 percent; preparing a suspension with the mass concentration of between1 and 10 percent by dispersing a carbon material with nanostructure in water; adding an organic solvent in an amount which is 0.01 to 1 percent based on the total weight of carbon suspension to serve as a wetting agent so as to increase the dispersion effect; mixing solution of iron phosphate and carbon suspension according to the mass proportion of iron to carbon of 100:0.1-5; and performing spray drying to dry and volatize the nitric acid to prepare the material with iron phosphate/nano carbon composite structure. The method realizes a composite cross structure of the iron phosphate material and is suitable for manufacturing high-performance iron lithium phosphate positive material; and the crystal grains of the positive material are small and the positive material has a high intrinsic conductive phase, so that the material has high multiplying power and low-temperature performance.
本发明公开了一种复合结构磷酸铁材料的制备方法,其方法是:首先用1-20%浓度的硝酸溶解固体的磷酸铁,制成磷酸铁摩尔浓度0.1~10M的水溶液,然后,将具有纳米结构的碳材料用水分散制成1-10%浓度的悬浊液,为增加分散效果,可以加入悬浊液总重量0.01-1%的有机溶剂作为润湿剂,然后将磷酸铁溶液和碳悬浮液按照磷酸铁∶碳=100∶0.1-5的比例混合后,进行喷雾干燥,硝酸被干燥挥发,得到具有磷酸铁/纳米碳复合结构的材料。本发明实现磷酸铁材料的复合交叉结构,适用于制造高性能的磷酸铁锂正极材料,使其正极材料晶粒小,同时具有内在的高导电相,从而具有良好的倍率和低温性能。

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    陈嘉甫,谭光薰: "《磷酸盐的生产与应用》", 31 December 1989, article "磷酸盐的生产与应用", pages: 314

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