| Structural and Morphological Studies of Two-Step
Synthesized LiCoO2 and Microwave Synthesized LiFePO4
Particles |
Bhuvanagiri Nageswara Rao,a,* Jaladi Nitchal Kirana and Nallani Satyanarayanab
Pages : 202-208
DOI : 10.1080/0371750X.2023.2227656
|
| Abstract |
| Crystalline dispersible LiCoO2 nanoparticles were synthesized by a rapid two-step
method. In the first step, Co3O4 nanoparticles were obtained by facile microwave
assisted hydrothermal method. In the second step, the as-synthesized Co3O4
nanoparticles were transformed into LiCoO2 nanoparticles through solid-state reaction
method. Olivine LiFePO4 with spindle like microstructure was prepared by rapid
microwave assisted hydrothermal method within short time at 140oC. The synthesized
samples were characterized by X-ray diffraction (XRD) analysis, Fourier transform
infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and energy
dispersive X-ray spectroscopy (EDX). The XRD reflection peaks revealed that the
synthesized LiCoO2 belongs to R-3m space group with hexagonal crystal structure.
No impurity phase of Co3O4 was detected in LiCoO2 after calcination at 750oC for 1 h.
Powder XRD results also authenticated the formation of LiFePO4 phase with
orthorhombic crystal structure. FTIR analysis revealed the structural co-ordination
of the prepared LiFePO4 particles. SEM analysis showed the formation of
monodispersed LiCoO2 nanoparticles with spherical particle morphology. For LiFePO4,
SEM analysis revealed the formation of porous spindle like microstructure, composed
of densely packed secondary nanoflakes. Further, EDX spectra of the samples
confirmed the presence of corresponding elements in the synthesized samples.
[Keywords: Cathode material, LiCoO2, LiFePO4, Microwave synthesis, Structural
properties, Morphology] |
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