Synthesis of Nitrogen doped TiO2 with superior ultrafast charging properties

Rechargeable Lithium Ion Batteries (LIB) have garnered numerous interests in the last few decades due to various advantages over traditional lead-acid batteries. In addition, with the gaining traction of usage of renewable energies and transition to technology dependent era, batteries provide the re...

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Main Author: Tang, Ernest Jun Jie
Other Authors: Chen Xiaodong
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2019
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Online Access:http://hdl.handle.net/10356/77267
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-772672023-03-17T02:17:53Z Synthesis of Nitrogen doped TiO2 with superior ultrafast charging properties Tang, Ernest Jun Jie Chen Xiaodong School of Materials Science and Engineering chenxd@ntu.edu.sg Engineering::Materials::Energy materials Engineering::Materials::Nanostructured materials Rechargeable Lithium Ion Batteries (LIB) have garnered numerous interests in the last few decades due to various advantages over traditional lead-acid batteries. In addition, with the gaining traction of usage of renewable energies and transition to technology dependent era, batteries provide the required source of portable electrical power. However, currently lithium ion batteries have various limitations such as commonly used graphite anode has low intercalation voltage with respect to Li/Li+, which results in safety hazards due to lithium dendrite formation. As such new materials are developed to address this issue. One material of focus would be the use of Titanium Dioxide nanotubes, bronze phase, known as TiO2 as an anode material for LIB applications. The higher intercalation voltage of approximately 1.5 V with respect to Li/Li+ makes it a viable and safe alternative anode material. Through nano-structuring, titanate nanotubes are synthesised with TiO2 phase for this experiment due to its high theoretical specific capacity of 335 mAh/g among titanate polymorphs and the electrochemical benefits of nanotube structure. Given that pure titanate has a relatively poor electron conductivity, doping of the TiO2 nanotubes with nitrogen through calcination with urea is done to improve the electrochemical performance of the N-TiO2 nanotubes to achieve higher specific capacity for both low and high charge and discharge rates as compared to existing pure TiO2 nanotubes. As such, these TiO2 nanotubes will have pseudocapacitive properties which could be viable for ultra-fast charging applications. This has proven to be successful and the as-synthesised N-TiO2 nanotubes have an improvement in specific capacity of at least 85% at discharge-charge rates of 10 C and above. In addition, the N-TiO2 anode have shown superior cyclability with a specific capacity of approximately 130 mAh/g and near 100% capacity retention even after 500 cycles. As such, this shows a proof of concept of the superior ultra-fast charging properties Bachelor of Engineering (Materials Engineering) 2019-05-23T08:15:59Z 2019-05-23T08:15:59Z 2019 Final Year Project (FYP) Tang, E. J. J. (2019). Synthesis of Nitrogen doped TiO2 with superior ultrafast charging properties. Final Year Project (FYP), Nanyang Technological University, Singapore. http://hdl.handle.net/10356/77267 http://hdl.handle.net/10356/77267 en 48 p. application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials::Energy materials
Engineering::Materials::Nanostructured materials
spellingShingle Engineering::Materials::Energy materials
Engineering::Materials::Nanostructured materials
Tang, Ernest Jun Jie
Synthesis of Nitrogen doped TiO2 with superior ultrafast charging properties
description Rechargeable Lithium Ion Batteries (LIB) have garnered numerous interests in the last few decades due to various advantages over traditional lead-acid batteries. In addition, with the gaining traction of usage of renewable energies and transition to technology dependent era, batteries provide the required source of portable electrical power. However, currently lithium ion batteries have various limitations such as commonly used graphite anode has low intercalation voltage with respect to Li/Li+, which results in safety hazards due to lithium dendrite formation. As such new materials are developed to address this issue. One material of focus would be the use of Titanium Dioxide nanotubes, bronze phase, known as TiO2 as an anode material for LIB applications. The higher intercalation voltage of approximately 1.5 V with respect to Li/Li+ makes it a viable and safe alternative anode material. Through nano-structuring, titanate nanotubes are synthesised with TiO2 phase for this experiment due to its high theoretical specific capacity of 335 mAh/g among titanate polymorphs and the electrochemical benefits of nanotube structure. Given that pure titanate has a relatively poor electron conductivity, doping of the TiO2 nanotubes with nitrogen through calcination with urea is done to improve the electrochemical performance of the N-TiO2 nanotubes to achieve higher specific capacity for both low and high charge and discharge rates as compared to existing pure TiO2 nanotubes. As such, these TiO2 nanotubes will have pseudocapacitive properties which could be viable for ultra-fast charging applications. This has proven to be successful and the as-synthesised N-TiO2 nanotubes have an improvement in specific capacity of at least 85% at discharge-charge rates of 10 C and above. In addition, the N-TiO2 anode have shown superior cyclability with a specific capacity of approximately 130 mAh/g and near 100% capacity retention even after 500 cycles. As such, this shows a proof of concept of the superior ultra-fast charging properties
author2 Chen Xiaodong
author_facet Chen Xiaodong
Tang, Ernest Jun Jie
format Final Year Project
author Tang, Ernest Jun Jie
author_sort Tang, Ernest Jun Jie
title Synthesis of Nitrogen doped TiO2 with superior ultrafast charging properties
title_short Synthesis of Nitrogen doped TiO2 with superior ultrafast charging properties
title_full Synthesis of Nitrogen doped TiO2 with superior ultrafast charging properties
title_fullStr Synthesis of Nitrogen doped TiO2 with superior ultrafast charging properties
title_full_unstemmed Synthesis of Nitrogen doped TiO2 with superior ultrafast charging properties
title_sort synthesis of nitrogen doped tio2 with superior ultrafast charging properties
publisher Nanyang Technological University
publishDate 2019
url http://hdl.handle.net/10356/77267
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