کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9761672 | 1498424 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrochemical performance of nanostructured LiMxMn2âxO4 (MÂ =Â Co and Al) powders at high charge-discharge operations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Nanostructured LiMxMn2âxO4(M = Co and Al, 0 â¤Â x â¤Â 0.3) powders were successfully synthesized by an ultrasonic spray pyrolysis technique from the precursor solutions; LiNO3, Mn(NO3)2·6H2O and Co(NO3)2·6H2O or Al(NO3)3 · 9H2O were stoichiometrically dissolved into distilled water. The product characteristics such as crystallinity, specific surface area, particle morphology and interior structure of particles, were examined with X-ray diffraction (XRD), the Brunauer-Emmet-Teller (BET) method, field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM), respectively. The chemical composition of the samples was also performed by inductively coupled plasma-optical emission spectroscopy (ICP-OES). The resulting powders were spherical nanostructered particles, which comprised of the primary particles with a few tens of nanometers in sizes. All the samples exhibited a pure cubic spinel structure without any impurities in the XRD patterns, while the surface morphology of as-prepared powders changed from porous to smooth microstructure with the amount of Co or Al substitution. The as-prepared samples were sintered at 750 °C for 4 h in air. However, the particles morphology and pure spinel phase of nanostructured LiMxMn2âxO4(M = Co and Al)powders did not change after sintering. The as-sintered samples were used as cathode active materials for lithium-ion battery, and electrochemical studies were carried out on the charge/discharge characteristics of the Li / LiMxMn2âxO4(M = Co and Al) cells at room temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 176, Issues 11â12, 31 March 2005, Pages 1027-1034
Journal: Solid State Ionics - Volume 176, Issues 11â12, 31 March 2005, Pages 1027-1034
نویسندگان
Zhumabay Bakenov, Izumi Taniguchi,