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Synthesis And Electrochemical Behavior Of Lifepo4/C With Air-Electrode For Aqueous Lithium Ion Battery

An aqueous rechargeable lithium ion battery (ARLB) has become a great solution to overwhelm the cost and safety issue of the conventional lithium ion battery with organic electrolyte. Recently, the in situ carbon layer was proven to avoid any direct contact between the nanoparticles and the environm...

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Main Author: Alias, Nurhaswani
Format: Thesis
Language:English
Published: 2015
Subjects:
TN Mining Engineering. Metallurgy
Online Access:http://eprints.usm.my/40948/1/NURHASWANI_BINTI_ALIAS_24_pages.pdf
http://eprints.usm.my/40948/
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spelling my.usm.eprints.40948 http://eprints.usm.my/40948/ Synthesis And Electrochemical Behavior Of Lifepo4/C With Air-Electrode For Aqueous Lithium Ion Battery Alias, Nurhaswani TN Mining Engineering. Metallurgy An aqueous rechargeable lithium ion battery (ARLB) has become a great solution to overwhelm the cost and safety issue of the conventional lithium ion battery with organic electrolyte. Recently, the in situ carbon layer was proven to avoid any direct contact between the nanoparticles and the environment, including O2 and H2O. This help to achieve high capacity battery with improved capacity retention in aqueous environment. A citric acid assisted sol-gel method is employed in this study to prepare carbon-coated lithium iron phosphate (LiFePO4/C) using different calcination temperatures (500–800 °C). The phase structure and elemental analyses confirmed the orthorhombic crystal structure of LiFePO4 surrounded by different amounts of carbon layer. The morphologies and physical absorption results proved the porous structure of LiFePO4/C with a mesoporous range. The calcination temperature influences the crystallite size, impurity phase, and surface area as the LiFePO4/C calcined at 700 °C offered the optimum properties. This finding was supported by the electrochemical behavior of LiFePO4/C in the ARLB system with an air-electrode. The LiFePO4/C calcined at 700 °C showed the highest current response for cyclic voltammetry and the lowest impedance (6.11 Ω) with a good discharge capacity (83 mA h g−1 at 1.0 C). In addition, good cycling stability was achieved as the LiFePO4/C maintained a discharge capacity of approximately 90 mA h g−1 within 30 cycles at 0.5 C. By contrast, bare LiFePO4, which was calcined at the same calcination temperature (700 °C), exhibited poor electrochemical performance with high capacity fading (45 % within 30 cycles at 0.5 C) because of high 2 impedance (18.98 Ω). The rate capability of the LiFePO4/C calcined at 700 °C was also compared with that of a platinum counter electrode; the air-electrode still showed better cycling behavior. 2015 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/40948/1/NURHASWANI_BINTI_ALIAS_24_pages.pdf Alias, Nurhaswani (2015) Synthesis And Electrochemical Behavior Of Lifepo4/C With Air-Electrode For Aqueous Lithium Ion Battery. Masters thesis, Universiti Sains Malaysia.
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic TN Mining Engineering. Metallurgy
spellingShingle TN Mining Engineering. Metallurgy
Alias, Nurhaswani
Synthesis And Electrochemical Behavior Of Lifepo4/C With Air-Electrode For Aqueous Lithium Ion Battery
description An aqueous rechargeable lithium ion battery (ARLB) has become a great solution to overwhelm the cost and safety issue of the conventional lithium ion battery with organic electrolyte. Recently, the in situ carbon layer was proven to avoid any direct contact between the nanoparticles and the environment, including O2 and H2O. This help to achieve high capacity battery with improved capacity retention in aqueous environment. A citric acid assisted sol-gel method is employed in this study to prepare carbon-coated lithium iron phosphate (LiFePO4/C) using different calcination temperatures (500–800 °C). The phase structure and elemental analyses confirmed the orthorhombic crystal structure of LiFePO4 surrounded by different amounts of carbon layer. The morphologies and physical absorption results proved the porous structure of LiFePO4/C with a mesoporous range. The calcination temperature influences the crystallite size, impurity phase, and surface area as the LiFePO4/C calcined at 700 °C offered the optimum properties. This finding was supported by the electrochemical behavior of LiFePO4/C in the ARLB system with an air-electrode. The LiFePO4/C calcined at 700 °C showed the highest current response for cyclic voltammetry and the lowest impedance (6.11 Ω) with a good discharge capacity (83 mA h g−1 at 1.0 C). In addition, good cycling stability was achieved as the LiFePO4/C maintained a discharge capacity of approximately 90 mA h g−1 within 30 cycles at 0.5 C. By contrast, bare LiFePO4, which was calcined at the same calcination temperature (700 °C), exhibited poor electrochemical performance with high capacity fading (45 % within 30 cycles at 0.5 C) because of high 2 impedance (18.98 Ω). The rate capability of the LiFePO4/C calcined at 700 °C was also compared with that of a platinum counter electrode; the air-electrode still showed better cycling behavior.
format Thesis
author Alias, Nurhaswani
author_facet Alias, Nurhaswani
author_sort Alias, Nurhaswani
title Synthesis And Electrochemical Behavior Of Lifepo4/C With Air-Electrode For Aqueous Lithium Ion Battery
title_short Synthesis And Electrochemical Behavior Of Lifepo4/C With Air-Electrode For Aqueous Lithium Ion Battery
title_full Synthesis And Electrochemical Behavior Of Lifepo4/C With Air-Electrode For Aqueous Lithium Ion Battery
title_fullStr Synthesis And Electrochemical Behavior Of Lifepo4/C With Air-Electrode For Aqueous Lithium Ion Battery
title_full_unstemmed Synthesis And Electrochemical Behavior Of Lifepo4/C With Air-Electrode For Aqueous Lithium Ion Battery
title_sort synthesis and electrochemical behavior of lifepo4/c with air-electrode for aqueous lithium ion battery
publishDate 2015
url http://eprints.usm.my/40948/1/NURHASWANI_BINTI_ALIAS_24_pages.pdf
http://eprints.usm.my/40948/
_version_ 1643710084653514752
score 13.211869

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