naa a22 4500 510800882 CHVBK 20180411083354.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s11664-013-2588-x doi (NATIONALLICENCE)springer-10.1007/s11664-013-2588-x Synthesis, Structure, and Electrochemistry of Sm-Modified LiMn2O4 Cathode Materials for Lithium-Ion Batteries [Elektronische Daten] [Abdalla Khedr, Morsi Abou-Sekkina, Fouad El-Metwaly] Spinel lithium manganese oxide and a series of Sm/LiMn2O4 spinels with different Sm additive contents (x=0.02%, 0.05%) were prepared for the first time via a coprecipitation method for rechargeable lithium-ion batteries. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive analysis of x-rays (EDAX), infrared (IR), and electron spin resonance spectral studies as well as various electrochemical measurements were used to examine the structural and electrochemical characteristics of LiMn2−x Sm x O4 (x=0.00%, 0.02%, 0.05%). XRD and SEM studies confirmed the nano materials size for all prepared spinels. From cyclic voltammetry studies, in terms of peak splitting, electrochemical active surface area, and intensity of the peaks, the LiMn1.98Sm0.02O4 sample possesses better electrochemical performance compared with the LiMn1.95Sm0.05O4 sample. Hence, limited addition of a rare-earth dopant is preferable to obtain better efficiency. Direct-current (DC) electrical conductivity measurements indicated that these samples are semiconducting and their activation energies decrease with increasing rare-earth Sm3+ content. TMS, 2013 Nano lithium manganates nationallicence Sm3+ doping nationallicence electrical properties nationallicence Khedr Abdalla Chemistry Department, Faculty of Science, Tanta University, Medical Campus, El-Bahr Street, Tanta, Egypt aut Abou-Sekkina Morsi Chemistry Department, Faculty of Science, Tanta University, Medical Campus, El-Bahr Street, Tanta, Egypt aut El-Metwaly Fouad Chemistry Department, Faculty of Science, Tanta University, Medical Campus, El-Bahr Street, Tanta, Egypt aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/6(2013-06-01), 1275-1281 0361-5235 42:6<1275 2013 42 11664 https://doi.org/10.1007/s11664-013-2588-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-013-2588-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Khedr Abdalla Chemistry Department, Faculty of Science, Tanta University, Medical Campus, El-Bahr Street, Tanta, Egypt aut NATIONALLICENCE 700 1- Abou-Sekkina Morsi Chemistry Department, Faculty of Science, Tanta University, Medical Campus, El-Bahr Street, Tanta, Egypt aut NATIONALLICENCE 700 1- El-Metwaly Fouad Chemistry Department, Faculty of Science, Tanta University, Medical Campus, El-Bahr Street, Tanta, Egypt aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/6(2013-06-01), 1275-1281 0361-5235 42:6<1275 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer