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利用柠檬酸辅助溶胶-凝胶法制备了锰酸锂多孔纳米结构,其中柠檬酸起着络合剂和燃烧供热剂的双重作用。所得产物用X射线粉末衍射仪、扫描电子显微镜、透射电子显微镜、高分辨透射电子显微镜进行表征并测试其比表面积、孔径分布。结果表明,制备产物为具有蜂窝状外形的双重孔状结构材料,一种是尺寸在几百纳米的类似半球的大孔,另一种则是尺寸只有几纳米的狭缝型介孔。这种双重孔状结构是由超细纳米颗粒连接而成,其尺寸主要在3到10 nm之问。其BET表所积是116 m~2/g,明显高于文献报道的其他方法制备的锰酸锂纳米材料。
Porous nanostructures of lithium manganate were prepared by citric acid-assisted sol-gel method, in which citric acid played the dual role of complexing agent and combustion heat agent. The resulting product was characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, high resolution transmission electron microscopy and tested for its specific surface area, pore size distribution. The results show that the prepared product is a double-cell structure material with a honeycomb shape, one is a hemispheric-like macropore with a size of several hundred nanometers, and the other is a slot-type mesopore with a size of only a few nanometers. This dual cell structure is made of ultrafine nanoparticles connected by a size of 3 to 10 nm. The BET surface area is 116 m 2 / g, which is obviously higher than that of lithium manganate nanomaterials prepared by other methods reported in the literature.