Synthesis of lithium-cobalt oxide nanoparticles by flame spray pyrolysis
Synthesis of lithium-cobalt oxide nanoparticles by flame spray pyrolysis
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DOI：
10.1080/027868290524016
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发表时间：
2004-10-01
影响因子：
5.2
通讯作者：
Lee, CK
中科院分区：
文献类型：
--
作者：
Jang, HD;Seong, CM;Lee, CK
采用火焰喷雾热分解法，以醋酸锂和醋酸钴为原料，合成了结晶性的LiCoO 2纳米颗粒，并通过TEM、XRD和BET等方法对其进行了表征。我们研究了LiCoO 2纳米颗粒从液滴沿沿着喷射的演变，并观察到约10 μ m的水性前体液滴在高温火焰中分解成约50 nm的较小碎片，以及前体的分解/氧化和聚结/凝聚。我们还研究了工艺变量如前体的摩尔浓度和可燃气体的流速对颗粒尺寸和晶体结构的影响。平均粒径随前驱体摩尔浓度的增加而增大。通过控制气体流速来提高最高火焰温度也导致颗粒平均直径的增加。所合成的结晶纳米粒子为近球形，其平均初级粒径范围为11至35 nm。
Crystalline LiCoO2nanoparticles were synthesized from an aqueous solution of acetate compounds of lithium and cobalt by a flame spray pyrolysis, and characterized by TEM, XRD, and BET method. We investigated the evolution of LiCoO2nanoparticles from liquid droplets sprayed along the flame and observed disintegration of aqueous precursor droplets about 10 mu m into smaller fragments around 50 nm in the high temperature flame, as well as decomposition/oxidation of the precursor and coalescence/coagulation. We also examined effects of process variables such as molar concentrations of the precursors and flow rates of combustible gases on the particle size and crystal structure. The average particle diameter increased with an increase in the molar concentration of the precursor. Raising the maximum flame temperature by controlling the gas flow rates also led to an increase in the average diameter of the particles. The crystalline nanoparticles synthesized were nearly spherical, and their average primary particle diameters ranged from 11 to 35 nm.