Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes

Sodium superionic conducting materials (NASICON) are promising solid electrolytes for Li-ion rechargeable batteries. In this study, two compositions; lithium titanium aluminium phosphate (LTAP), Li1+xTi2-xAlx(PO4)3 (x = 0.0, 0.2, 0.6, 1.0) and lithium tantalum aluminium phosphate (LTaAP), Li1+2xTa1-...

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主要作者:	Kimpa, Mohammed Isah
格式:	Thesis
語言:	English English English
出版:	2018
主題:	TP250-261 Industrial electrochemistry
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spelling	my-uthm-ep.2142021-07-13T01:12:49Z Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes 2018-03 Kimpa, Mohammed Isah TP250-261 Industrial electrochemistry Sodium superionic conducting materials (NASICON) are promising solid electrolytes for Li-ion rechargeable batteries. In this study, two compositions; lithium titanium aluminium phosphate (LTAP), Li1+xTi2-xAlx(PO4)3 (x = 0.0, 0.2, 0.6, 1.0) and lithium tantalum aluminium phosphate (LTaAP), Li1+2xTa1-xAlx+1(PO4)3 (0 ~ 0.5) solid electrolyte were synthesized via solid state reaction techniques at various sintering temperature ranging from 700 to 1000 °C for 8 and 12 h respectively. Lithium carbonate (Li2CO3), titanium dioxide (TiO2), aluminium dioxide (Al2O3), tantalum oxide (Ta2O5) and ammonium dihydrogen phosphate (NH4H2PO4) of high purity grade were used as the starting material. Physical properties of LTAP and LTaAP electrolyte show bulk density of 2.83 and 3.63 g/cm3 at 900 and 800 °C sintering temperature. XRD revealed major phase of LiTi2(PO4)3 NASICON structure and secondary phases (Ti4(PO5)3, TiO2 and AlPO4) co-exist in LTAP and LTaAP samples. FTIR shows presence of NASICON phosphate peaks which were dominated with vibration of PO4 ion in all prepared LTAP and LTaAP electrolytes. This also confirms the presence of LiTi2(PO4)3 in all of the samples. The ionic conductivity of solid electrolytes was analyzed with IS at room temperature. The highest conductivity was 1.06 x 10-4 and 9.854 x 10-6 S/cm for Li1.2Ti1.8Al0.2(PO4)3 and Li1.2Ta0.9Al1.1(PO4)3 electrolytes at room temperature. Conductivity behavior is enhanced when the sample was doped with aluminium, x = 0.2 for LTAP and x = 0.1 for LTaAP composition. The high ionic conductivity of LTAP-0.2 was supported by density data and lower impurity peaks, as reported in XRD. LTAP had better conductivity behavior compared to LTaAP composition which could be due to hard nature of tantalum in the stoichiometry ratio of LTaAP compound resulted into wide grain boundary and lower its conductivity. However, from ac conductivity analysis, the conductivity values for LTAP-0.2 and LTaAP-0.1 are within the range of 0 < s < 1. 2018-03 Thesis http://eprints.uthm.edu.my/214/ http://eprints.uthm.edu.my/214/1/24p%20MOHAMMED%20ISAH%20KIMPA.pdf text en public http://eprints.uthm.edu.my/214/2/MOHAMMED%20ISAH%20KIMPA%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/214/3/MOHAMMED%20ISAH%20KIMPA%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Sains Gunaan dan Teknolgi
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TP250-261 Industrial electrochemistry
spellingShingle	TP250-261 Industrial electrochemistry Kimpa, Mohammed Isah Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes
description	Sodium superionic conducting materials (NASICON) are promising solid electrolytes for Li-ion rechargeable batteries. In this study, two compositions; lithium titanium aluminium phosphate (LTAP), Li1+xTi2-xAlx(PO4)3 (x = 0.0, 0.2, 0.6, 1.0) and lithium tantalum aluminium phosphate (LTaAP), Li1+2xTa1-xAlx+1(PO4)3 (0 ~ 0.5) solid electrolyte were synthesized via solid state reaction techniques at various sintering temperature ranging from 700 to 1000 °C for 8 and 12 h respectively. Lithium carbonate (Li2CO3), titanium dioxide (TiO2), aluminium dioxide (Al2O3), tantalum oxide (Ta2O5) and ammonium dihydrogen phosphate (NH4H2PO4) of high purity grade were used as the starting material. Physical properties of LTAP and LTaAP electrolyte show bulk density of 2.83 and 3.63 g/cm3 at 900 and 800 °C sintering temperature. XRD revealed major phase of LiTi2(PO4)3 NASICON structure and secondary phases (Ti4(PO5)3, TiO2 and AlPO4) co-exist in LTAP and LTaAP samples. FTIR shows presence of NASICON phosphate peaks which were dominated with vibration of PO4 ion in all prepared LTAP and LTaAP electrolytes. This also confirms the presence of LiTi2(PO4)3 in all of the samples. The ionic conductivity of solid electrolytes was analyzed with IS at room temperature. The highest conductivity was 1.06 x 10-4 and 9.854 x 10-6 S/cm for Li1.2Ti1.8Al0.2(PO4)3 and Li1.2Ta0.9Al1.1(PO4)3 electrolytes at room temperature. Conductivity behavior is enhanced when the sample was doped with aluminium, x = 0.2 for LTAP and x = 0.1 for LTaAP composition. The high ionic conductivity of LTAP-0.2 was supported by density data and lower impurity peaks, as reported in XRD. LTAP had better conductivity behavior compared to LTaAP composition which could be due to hard nature of tantalum in the stoichiometry ratio of LTaAP compound resulted into wide grain boundary and lower its conductivity. However, from ac conductivity analysis, the conductivity values for LTAP-0.2 and LTaAP-0.1 are within the range of 0 < s < 1.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Kimpa, Mohammed Isah
author_facet	Kimpa, Mohammed Isah
author_sort	Kimpa, Mohammed Isah
title	Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes
title_short	Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes
title_full	Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes
title_fullStr	Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes
title_full_unstemmed	Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes
title_sort	physical and electrical properties of li1+xti2-xalx(po4)3 and li1+2xta1-xalx+1(po4)3 electrolytes
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Sains Gunaan dan Teknolgi
publishDate	2018
url	http://eprints.uthm.edu.my/214/1/24p%20MOHAMMED%20ISAH%20KIMPA.pdf http://eprints.uthm.edu.my/214/2/MOHAMMED%20ISAH%20KIMPA%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/214/3/MOHAMMED%20ISAH%20KIMPA%20WATERMARK.pdf
_version_	1747830555759607808

Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes

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