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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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Main Author: Kimpa, Mohammed Isah
Format: Thesis
Language:English
English
English
Published: 2018
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TP Chemical technology
Online Access:http://eprints.uthm.edu.my/22/1/24p%20MOHAMMED%20ISAH%20KIMPA.pdf
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spelling my.uthm.eprints.222021-06-06T08:30:08Z http://eprints.uthm.edu.my/22/ Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes Kimpa, Mohammed Isah TP Chemical technology 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 NonPeerReviewed text en http://eprints.uthm.edu.my/22/1/24p%20MOHAMMED%20ISAH%20KIMPA.pdf text en http://eprints.uthm.edu.my/22/2/MOHAMMED%20ISAH%20KIMPA%20COPYRIGHT%20DECLARATION.pdf text en http://eprints.uthm.edu.my/22/3/MOHAMMED%20ISAH%20KIMPA%20WATERMARK.pdf Kimpa, Mohammed Isah (2018) Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.
institution Universiti Tun Hussein Onn Malaysia
building UTHM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tun Hussein Onn Malaysia
content_source UTHM Institutional Repository
url_provider http://eprints.uthm.edu.my/
language English
English
English
topic TP Chemical technology
spellingShingle TP Chemical technology
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
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
publishDate 2018
url http://eprints.uthm.edu.my/22/1/24p%20MOHAMMED%20ISAH%20KIMPA.pdf
http://eprints.uthm.edu.my/22/2/MOHAMMED%20ISAH%20KIMPA%20COPYRIGHT%20DECLARATION.pdf
http://eprints.uthm.edu.my/22/3/MOHAMMED%20ISAH%20KIMPA%20WATERMARK.pdf
http://eprints.uthm.edu.my/22/
_version_ 1738580683950915584
score 13.211869

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