Nano-crystalline LiMnPO4 prepared by a new phosphate–formate precursor method
Nano-crystalline LiMnPO4 prepared by a new phosphate–formate precursor method
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DOI：
10.1016/j.matchemphys.2010.01.043
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发表时间：
2010-05
影响因子：
4.6
通讯作者：
V. Koleva;R. Stoyanova;E. Zhecheva
中科院分区：
文献类型：
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作者：
V. Koleva;R. Stoyanova;E. Zhecheva
通过冷冻干燥含有锂、Mn(II)、磷酸根和甲酸根离子的溶液来制备均质磷酸盐-甲酸盐前体，确保在 400°C 以上的温度下生产化学计量、结晶良好、无缺陷的纳米级 LiMnPO4 粉末。系统研究了合成条件对LiMnPO4结构和形貌的影响。经证实，冷冻干燥溶液的浓度和退火温度强烈影响 LiMnPO4 的结构、颗粒尺寸和形态。 LiMnPO4 具有低程度的 Li-Mn 无序（低于 1%），在 500 至 600°C 之间形成。由稀释的冻干溶液在相对较低的退火温度下制备出尺寸分布在 60-120nm 范围内的均匀且规则的颗粒。
The preparation of homogeneous phosphate–formate precursors by freeze-drying of solutions containing lithium, Mn(II), phosphate and formate ions ensures production of stoichiometric, well crystallized, defectless and nano-sized LiMnPO4powders at temperatures above 400°C. A systematic study of the influence of the synthesis conditions on the structure and morphology of LiMnPO4is performed. It is established that the concentration of the solutions subjected to freeze-drying and the annealing temperature strongly affect the structure, particle dimensions and morphology of LiMnPO4. LiMnPO4with low extent of Li-to-Mn disorder (below 1%) are formed between 500 and 600°C. Uniform and regular particles with close sizes distribution in the 60–120nm range are prepared from diluted freeze-dried solutions and at relatively low annealing temperature.