Study of Co3O4 mesoporous nanosheets prepared by a simple spray-drying process and their electrochemical properties as anode material for lithium secondary batteries
Study of Co3O4 mesoporous nanosheets prepared by a simple spray-drying process and their electrochemical properties as anode material for lithium secondary batteries
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DOI：
10.1016/j.electacta.2013.10.217
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发表时间：
2014-01
影响因子：
6.6
通讯作者：
Mun Yeong Son;J. H. Kim;Y. Kang
中科院分区：
文献类型：
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作者：
Mun Yeong Son;J. H. Kim;Y. Kang
采用喷雾干燥法制备了具有上级电化学性能的Co 3 O 4纳米片。通过喷雾干燥工艺获得的具有中空和薄壁结构的前体粉末在低于600 °C的温度下进行后处理工艺后变成纳米片。柠檬酸溶解在钴前驱体的喷雾溶液中是形成空心薄壁前驱体粉末的关键物质。在200和400 °C下后处理的Co 3 O 4纳米片的平均微晶尺寸分别为17和24 nm。由TEM图像测量的由纳米片组成的平均粉末尺寸与粉末的平均微晶尺寸相似。在1400 mA g-1的电流密度下，200和400 oC后处理的Co 3 O 4纳米片的放电容量分别为925和1102 mA h g-1，在100次循环后，第一次循环后测得的相应容量保持率分别为91%和110%。400 °C后处理的Co 3 O 4纳米片在3500和7000 mA g-1的高电流密度下的初始放电容量分别为1199和1122 mA h g-1，100次循环后的放电容量分别为868和695 mA h g-1。
Co3O4nanosheets with superior electrochemical properties are prepared by a spray drying process. The precursor powders with a hollow and a thin-walled structure, obtained by the spray drying process, turn into nanosheets after a post-treatment process at temperatures below 600 °C. Citric acid dissolved in the spray solution of the cobalt precursor is a key material for the formation of the hollow thin-walled precursor powders. The mean crystallite sizes of the Co3O4nanosheets post-treated at 200 and 400 °C are 17 and 24 nm, respectively. The mean powder sizes consisting of the nanosheets, as measured from the TEM images, are similar to the mean crystallite sizes of the powders. The discharge capacities of the Co3O4nanosheets post-treated at 200 and 400oC are 925 and 1102 mA h g-1, respectively, at a current density of 1400 mA g-1after 100 cycles, and the corresponding capacity retentions, measured after the first cycle, are 91% and 110%. The initial discharge capacities of the Co3O4nanosheets post-treated at 400 °C are 1199 and 1122 mA h g-1at high current densities of 3500 and 7000 mA g-1, respectively, and the discharge capacities after 100 cycles are 868 and 695 mA h g-1.