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李晓杰
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任职 : 爆炸技术研究所所长

性别: 男

毕业院校: 中国科学技术大学

学位: 博士

所在单位: 力学与航空航天学院

学科: 工程力学

办公地点: 力学楼224室

联系方式: 041184706163 科研之友主页: https://www.scholarmate.com/P/JzE7ru

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Ultrafine oxides during detonation expanse at a fast quenching rate

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论文类型: 会议论文

发表时间: 2021-07-21

卷号: 324-325

页面范围: 189-+

关键字: synthesis; detonation expanse; battery; quenching; green chemistry

摘要: Nanostructured spherical lithium manganese oxide (Li-Mn-O) with about 30nm in diameter was synthesized for the first time by explosive method. The water-solubility explosive was prepared using a simple facility at room temperature. The growth of lithium manganese oxides via detonation reaction was investigated with respect to the presence of an energetic precursor, such as the metallic nitrate and the degree of confinement of the explosive charge. The detonation products were characterized by scanning electron microscopy. Powder X-ray diffraction and transmission electron microscopy were used to characterize the products. Lithium manganese oxides with spherical morphology and more uniform secondary particles, with smaller primary particles of diameters from 10 to 50 nm and a variety of morphologies were found. Lithium manganese oxides with a fine spherical morphology different from that of the normal is formed after detonation wave treatment due to the very high quenching rate. It might also provide a cheap large-scale synthesis method. Explosive detonation is strongly nonequilibrium processes, generating a short duration of high pressure and high temperature. Free metal atoms are first released with the decomposition of explosives, and then theses metal and oxygen atoms are rearranged, coagulated and finally crystallized into lithium manganese oxides during the expansion of detonation process. For detonation of the water-solubility explosive, the detonation pressure, the detonation temperature and the adiabatic gamma were close to 3 GPa, 2300 K and 3. The inherent short duration, high heating rate (10(10)- 10(11) K/s) and high cooling rate (10(8) - 10(9) K/s) prevent the lithium manganese oxides crystallites from growing into larger sizes and induce considerable lattice distortion.

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