Lithium metal oxides (metal = manganese, chromium, cobalt, or aluminium) as cathode in lithium ion batery

Spinel LiMn2O4 (CA-EG mixture assisted), LiMn2O4 (CA assisted), LiMn2O4 (PA assisted), Cr-doped LiCrxMn2-xO4 and layered LiCo0.7Al0.3O2 (CA and PA assisted) cathode materials have been synthesized by a sol-gel method using organic acid as a chelating agent. This technique offers better homogeneity,...

Full description

Saved in:

Bibliographic Details
Main Author:	Rahman, Mohd. Mokhlesur
Format:	Thesis
Language:	English
Published:	2006
Subjects:	Q Science (General) QD Chemistry
Online Access:	http://eprints.utm.my/id/eprint/2324/1/MohdMokhlesurRahmanMFS2006.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-utm-ep.2324
record_format	uketd_dc
spelling	my-utm-ep.23242018-06-25T00:40:38Z Lithium metal oxides (metal = manganese, chromium, cobalt, or aluminium) as cathode in lithium ion batery 2006-09 Rahman, Mohd. Mokhlesur Q Science (General) QD Chemistry Spinel LiMn2O4 (CA-EG mixture assisted), LiMn2O4 (CA assisted), LiMn2O4 (PA assisted), Cr-doped LiCrxMn2-xO4 and layered LiCo0.7Al0.3O2 (CA and PA assisted) cathode materials have been synthesized by a sol-gel method using organic acid as a chelating agent. This technique offers better homogeneity, preferred surface morphology, reduced heat treatment conditions, sub-micron sized particles and better crystallinity. The dependence of the physiochemical properties of the powder materials on the various calcination temperatures and organic acid quantity have been extensively studied. Electrochemical behaviors of the prepared powder materials were analyzed using galvanostatic charge-discharge cycling studies in the voltage range 3.0-4.3 V (vs. Li metal) using 1 M LiPF6-EC/DMC as electrolyte. Materials LiMn2O4 (CA-EG mixture assisted), LiMn2O4 (CA assisted), LiMn2O4 (PA assisted), Cr-doped LiCrxMn2-xO4, LiCo0.7Al0.3O2 (CA assisted) and LiCo0.7Al0.3O2 (PA assisted) delivered initial discharge capacity of 29.66, 20.94, 41.65, 49.50, 97.34 and 74.43 mA h/g with the capacity retention of 71.4, 93.7, 90.6 , 91.6, 90.8 and 98.4 % of its initial capacity over only 3rd cycle, respectively. Coulombic efficiency for the materials of LiMn2O4 (CA-EG mixture assisted), LiMn2O4 (CA assisted), LiMn2O4 (PA assisted), Cr-doped LiCrxMn2-xO4, LiCo0.7Al0.3O2 (CA assisted) and LiCo0.7Al0.3O2 (PA assisted) were found to be 96.2, 89.18, 74.8, 97.6, 92.8 and 94.7 % after only three cycles, respectively. Electrochemical evaluation shows that LiCo0.7Al0.3O2 (CA assisted) materials exhibit higher initial discharge capacity whereas LiCo0.7Al0.3O2 (PA assisted) materials exhibit a better capacity retention and good coulombic efficiency 2006-09 Thesis http://eprints.utm.my/id/eprint/2324/ http://eprints.utm.my/id/eprint/2324/1/MohdMokhlesurRahmanMFS2006.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	Q Science (General) QD Chemistry
spellingShingle	Q Science (General) QD Chemistry Rahman, Mohd. Mokhlesur Lithium metal oxides (metal = manganese, chromium, cobalt, or aluminium) as cathode in lithium ion batery
description	Spinel LiMn2O4 (CA-EG mixture assisted), LiMn2O4 (CA assisted), LiMn2O4 (PA assisted), Cr-doped LiCrxMn2-xO4 and layered LiCo0.7Al0.3O2 (CA and PA assisted) cathode materials have been synthesized by a sol-gel method using organic acid as a chelating agent. This technique offers better homogeneity, preferred surface morphology, reduced heat treatment conditions, sub-micron sized particles and better crystallinity. The dependence of the physiochemical properties of the powder materials on the various calcination temperatures and organic acid quantity have been extensively studied. Electrochemical behaviors of the prepared powder materials were analyzed using galvanostatic charge-discharge cycling studies in the voltage range 3.0-4.3 V (vs. Li metal) using 1 M LiPF6-EC/DMC as electrolyte. Materials LiMn2O4 (CA-EG mixture assisted), LiMn2O4 (CA assisted), LiMn2O4 (PA assisted), Cr-doped LiCrxMn2-xO4, LiCo0.7Al0.3O2 (CA assisted) and LiCo0.7Al0.3O2 (PA assisted) delivered initial discharge capacity of 29.66, 20.94, 41.65, 49.50, 97.34 and 74.43 mA h/g with the capacity retention of 71.4, 93.7, 90.6 , 91.6, 90.8 and 98.4 % of its initial capacity over only 3rd cycle, respectively. Coulombic efficiency for the materials of LiMn2O4 (CA-EG mixture assisted), LiMn2O4 (CA assisted), LiMn2O4 (PA assisted), Cr-doped LiCrxMn2-xO4, LiCo0.7Al0.3O2 (CA assisted) and LiCo0.7Al0.3O2 (PA assisted) were found to be 96.2, 89.18, 74.8, 97.6, 92.8 and 94.7 % after only three cycles, respectively. Electrochemical evaluation shows that LiCo0.7Al0.3O2 (CA assisted) materials exhibit higher initial discharge capacity whereas LiCo0.7Al0.3O2 (PA assisted) materials exhibit a better capacity retention and good coulombic efficiency
format	Thesis
qualification_level	Master's degree
author	Rahman, Mohd. Mokhlesur
author_facet	Rahman, Mohd. Mokhlesur
author_sort	Rahman, Mohd. Mokhlesur
title	Lithium metal oxides (metal = manganese, chromium, cobalt, or aluminium) as cathode in lithium ion batery
title_short	Lithium metal oxides (metal = manganese, chromium, cobalt, or aluminium) as cathode in lithium ion batery
title_full	Lithium metal oxides (metal = manganese, chromium, cobalt, or aluminium) as cathode in lithium ion batery
title_fullStr	Lithium metal oxides (metal = manganese, chromium, cobalt, or aluminium) as cathode in lithium ion batery
title_full_unstemmed	Lithium metal oxides (metal = manganese, chromium, cobalt, or aluminium) as cathode in lithium ion batery
title_sort	lithium metal oxides (metal = manganese, chromium, cobalt, or aluminium) as cathode in lithium ion batery
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2006
url	http://eprints.utm.my/id/eprint/2324/1/MohdMokhlesurRahmanMFS2006.pdf
_version_	1747814410729029632

Lithium metal oxides (metal = manganese, chromium, cobalt, or aluminium) as cathode in lithium ion batery

Similar Items