Abstract
LiMn2O4spinel cathode materials have been successfully synthesized by solid-state reaction. Surface of these particles was modified by nanostructured LiFePO4via sol gel dip coating method. Synthesized products were characterized by thermally analyzed thermogravimetric and differential thermal analysis (TG/DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX). The results of electrochemical tests showed that the charge/discharge capacities improved and charge retention of battery enhanced. This improved electrochemical performance is caused by LiFePO4phosphate layer on surfaces of LiMn2O4cathode particles.
Highlights
Since the birth of the lithium ion battery in the early 1990s, its development has been very fast and it has been widely applied as power source for a lot of light and high value electronics due to its significant advantages over traditional rechargeable battery systems [1, 2]
The second loss in within the temperature range of 200 to 500◦C, where weight drop is about 33.4% which can be due to release of water during the crystallization as well as pyrolysis of citrate and other organic components
The last weight loss of the given gel will gradually initiate from the temperature of 522◦C and continue up to 800◦C
Summary
Since the birth of the lithium ion battery in the early 1990s, its development has been very fast and it has been widely applied as power source for a lot of light and high value electronics due to its significant advantages over traditional rechargeable battery systems [1, 2]. At the end of discharge, the Jahn Teller effect happening at first on the surface of some particles may expand into an overall composition of Li[1+δ]Mn2O4. Speaking, this system is not really at equilibrium. Recent research demonstrated that the importance of surface structural features of electrode materials for their electrochemical performance so, an effective strategy, coating the spinel LiMn2O4 with organic and inorganic compounds, has been investigated. The cycling and rate capacity of LiMn2O4 cathode materials were significantly enhanced by stabilizing the electrode surface with LiFePO4 nanostructure
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