Scientific African | |
Effect of Ni and Fe substitution on the thermal, structural, vibrational spectroscopic and electrochemical properties of LiMn2O4 cathode material | |
Chilotaw Tsona1  K. Vijaya Babu2  N. Murali3  Paulos Taddesse3  | |
[1] Corresponding author.;Department of Engineering Physics, College of Engineering (A), Andhra University, Visakhapatnam 530003, India;Department of Physics, College of Natural Science, Arba Minch University, Arba Minch, Ethiopia; | |
关键词: Cathode material; Ni and Fe substitution; Solid-state reaction; Thermal property; Structure; Cyclic performance; | |
DOI : | |
来源: DOAJ |
【 摘 要 】
Spinel LiMn2O4, Li1.025(Mn1.95Ni0.025Fe0.025)O4, and Li1.025(Mn1.9Ni0.025Fe0.05)O4 cathodes were synthesized by a two-step solid-state reaction method. The thermal, structural, vibrational spectra and electrochemical properties of these materials were characterized by using TGA-DTA, XRD, SEM, EDS, Fourier-FT-IR spectroscopy, Raman spectroscopy, and charge-discharge test. The TGA-DTA analysis confirmed that 800°C is the suitable temperature for synthesizing all the samples using Li2CO3, Fe2O3, MnO2, and NiO precursors. The XRD analysis revealed the formation of a single-phase cubic spinel structure with Fd3¯m space group. Two distinct strong absorption peaks were identified by FT-IR analysis in the wavenumber regions of 512 to 621 cm−1. Enhancement of the discharge specific capacity due to Ni and Fe substitution into LiMn2O4 was observed. Among all samples, Li1.025(Mn1.95Ni0.025Fe0.025)O4 exhibited excellent cyclic performance (97.4%) after 50 cycles.
【 授权许可】
Unknown