https://scholars.lib.ntu.edu.tw/handle/123456789/407480
標題: | Low temperature synthesis of nano-sized lithium manganese oxide powder by the sol-gel process using PVA | 作者: | Lu C.-H. Saha S.K. |
關鍵字: | LiMn 2 O 4;Lithium-ion battery;Powder;PVA;Sol-gel;Synthesis | 公開日期: | 2001 | 卷: | 20 | 期: | 1 | 起(迄)頁: | 27-34 | 來源出版物: | Journal of Sol-Gel Science and Technology | 摘要: | Lithium manganese oxide (LiMn 2 O 4 ) powder with spinel structure has been synthesized by a sol-gel method using an aqueous solution of metal nitrates containing polyvinyl alcohol (PVA). The role of PVA and the calcination conditions for the formation of LiMn 2 O 4 have been studied. Homogeneity and reactivity of the precursor powder are enhanced with an increase in the amount of PVA in the starting solution. When the amount of PVA is low, an impurity phase-Mn 2 O 3 is formed at low temperature. On the other hand, when the vinyl alcohol monomer unit of PVA to metal ion ratio is 2:1 in the starting solution, only spinel phase is formed at 180¢XC and organic-free LiMn 2 O 4 powder is obtained at as low as 400¢XC. Nanosized LiMn 2 O 4 particles with a narrow size distribution have been successfully prepared by this technique. This method with proper amount of PVA results in much lower calcination temperature and shorter calcination time for producing the single spinel phase in comparison with the conventional solid state reaction and other solution techniques. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407480 | ISSN: | 09280707 | DOI: | 10.1023/A:1008720515800 | SDG/關鍵字: | Calcination; Crystal structure; Differential thermal analysis; Fourier transform infrared spectroscopy; Low temperature effects; Nanostructured materials; Particle size analysis; Polyvinyl alcohols; Scanning electron microscopy; Synthesis (chemical); Thermogravimetric analysis; X ray diffraction analysis; Lithium manganese oxide; Sol gel process; Spinel structure; Vinyl alcohol monomer; Lithium compounds |
顯示於: | 化學工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。