DocumentCode :
3577396
Title :
Effect of synthesis conditions and composition modification on the structural and electrochemical properties of layered transition metal oxide cathode materials
Author :
El Mofid, Wassima ; Ivanov, Svetlozar ; Bund, Andreas
Author_Institution :
Dept. of Electrochem. & Electroplating, Tech. Univ. Ilmenau, Ilmenau, Germany
fYear :
2014
Firstpage :
626
Lastpage :
630
Abstract :
Novel and promising layered oxide cathode materials Li(Ni,Mn,Co)O2, with improved capacity and high stability during cycling, were obtained by cationic substitution and by optimization of the synthesis conditions. These cathode materials were prepared by self-combustion method using metal nitrates and sucrose as fuel. Synthesis was then followed by annealing at 900°C during 1h. The temperature and annealing plateau were optimized in order to adjust the average particle size and size distribution. Two annealing atmospheres (argon and air) were used as well to investigate their effect on the structure and morphology of the NMC material. The time between synthesis and annealing was also varied in order to study the aging effect. X-ray diffraction was carried out as first step and showed that all the obtained materials crystallize in the rhombohedral system (α-NaFeO2 type structure). The obtained results through scanning electron microscopy and galvanostatic cycling proved that the best performances were obtained for the substituted materials that were annealed directly after synthesis, under air atmosphere.
Keywords :
X-ray diffraction; ageing; annealing; argon; combustion; electrochemical electrodes; lithium compounds; optimisation; positive ions; scanning electron microscopy; secondary cells; sodium compounds; sugar; transition metal compounds; Ar; Li(NiMnCo)O2; NMC material; NaFeO2; X-ray diffraction; aging effect; air atmosphere; annealing atmospheres; annealing plateau; argon; cationic substitution; electrochemical properties; galvanostatic cycling; layered transition metal oxide cathode materials; metal nitrates; rhombohedral system; scanning electron microscopy; self-combustion method; sucrose; temperature 900 degC; time 1 h; Annealing; Atmosphere; Biology; Manganese; Materials; Nickel; X-ray scattering; Li ion battery; annealing conditions; cathode; cationic substitution; transition metal oxide;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Renewable and Sustainable Energy Conference (IRSEC), 2014 International
Print_ISBN :
978-1-4799-7335-4
Type :
conf
DOI :
10.1109/IRSEC.2014.7059798
Filename :
7059798
Link To Document :
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