کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1491670 | 992356 | 2009 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis of spherical nanostructured LiMxMn2−xO4 (M = Ni2+, Co3+, and Ti4+; 0 ≤ x ≤ 0.2) via a single-step ultrasonic spray pyrolysis method and their high rate charge–discharge performances Synthesis of spherical nanostructured LiMxMn2−xO4 (M = Ni2+, Co3+, and Ti4+; 0 ≤ x ≤ 0.2) via a single-step ultrasonic spray pyrolysis method and their high rate charge–discharge performances](/preview/png/1491670.png)
LiMxMn2−xO4 (M = Ni2+, Co3+, and Ti4+; 0 ≤ x ≤ 0.2) spinels were prepared via a single-step ultrasonic spray pyrolysis method. Comparative studies on powder properties and high rate charge–discharge electrochemical performances (from 1 to 15 C) were performed. XRD identified that pure spinel phase was obtained and M was successfully substituted for Mn in spinel lattice. SEM and TEM studies confirmed that powders had a feature of ‘spherical nanostructural’, that is, powders consisted of spherical secondary particles with the size of about 1 μm, which were developed from close-packed primary particles with several tens of nanometers. Substitutions enhanced density of second particles to different extents, depending on M and its content. Charge–discharge tests showed that as-prepared LiMn2O4 could deliver excellent rate performance (around 100 mAh/g at 10 C). Ni substitution contributed to improving electrochemical performances. In the voltage range of 4.95–3.5 V, the materials showed much better electrochemical performances than LiMn2O4 in terms of capacity, cycleability and rate capability.
Journal: Materials Research Bulletin - Volume 44, Issue 3, 5 March 2009, Pages 707–713