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三氧化钼(MoO3)以三种常见的物相存在:正交相、六方相和单斜相,前者为热力学稳定相,后两者为热力学介稳相.相对于稳定的正交相MoO3,介稳的六方相MoO3较难制备.笔者采用对已商品化的正交相MoO3再次结晶的方法制得了纯六方相MoO3.通过透射电镜(TEM)观察可知产物为均匀的纳米棒.实验结果表明合成的六方相MoO3的首次放电容量比商品化的正交相MoO3高.六方相MoO3有望成为理想的锂离子电池阴极材料.
MoO3 exists in three common phases: the orthorhombic phase, the hexagonal phase and the monoclinic phase, the former being the thermodynamically stable phase and the latter being the thermodynamically metastable phase. Compared with the stable orthorhombic phase MoO3, Metastable hexagonal phase MoO3 is more difficult to prepare.In this paper, a pure hexagonal phase MoO3 was prepared by the recrystallization of commercialized orthorhombic phase MoO3.The TEM shows that the product is homogeneous nanorods.The experimental results show that The first discharge capacity of the synthesized hexagonal MoO3 is higher than the commercial orthorhombic MoO3 hexagonal MoO3 is expected to become the ideal cathode material for lithium-ion batteries.