Interface design for silicon-based anodes for lithium-ion batteries
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Zhu, Hongzheng
issued: 2021-11-19T21:29:20Z
issued: 2021
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Lithium-ion batteries (LIBs) are promising energy storage systems for electric vehicles (EVs) and hybrid electric vehicles (HEVs). However, to meet the requirements for EVs and HEVs, the performance of commercially available LIBs needs to be greatly improved in energy density, cycling life, rate capability, and safety. It is well known that the LIB performance is highly dependent on the choice of electrode materials. Therefore, it is essential to develop new electrode materials as replacements for graphite anode used in commercial LIBs to achieve high-performance LIBs desirable for EV and HEV applications. Among all potential alternatives to graphite anode, Si-based materials are considered one of the most promising anodes due to their superior gravimetric capacity (4200 mAh g-1) and moderate discharge voltage. However, Si electrodes face several challenging issues, such as large volume changes, thick solid electrolyte interphase (SEI) layer, and electrode swelling. Hence, solving the above problems is crucial for enhancing the overall performance of Si anodes in LIBs for further practical applications. In this thesis, different coating materials were used to modify Si anode to achieve the above goal. Firstly, a facile and low-cost sol-gel method followed by annealing was developed to form a thin Al2O3 coating layer on the graphite/silicon composite anode. At 25 oC, the Al2O3-coated graphite/silicon (G/Si) electrode showed better cycling performance than the uncoated samples. The capacity retention could retain the initial capacity up to 76.4% after 100 cycles, while the uncoated G/Si could only reach 56.4%. Secondly, AlOxNy coating by plasma-enhanced atomic layer deposition (PEALD) was developed and applied on the Si electrode. By employing this as a surface modification, the confinement of silicon nanoparticles embedded into the electrode matrix is well achieved, while the kinetics of the charge/discharge process is enhanced due to the electrochemical properties o…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/80235
note: i Interface Design for Silicon-based Anodes for Lithium-ion Batteries by Hongzheng Zhu A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE COLLEGE OF GRADUATE STUDIES (Mechanical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) November, 2021 © Hongzheng Zhu, 2021 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: Interface Design for Silicon-based Anodes for Lithium-ion Batteries submitted by Hongzheng Zhu in partial fulfillment of the requirements of the degree of Doctor of Philosophy. Dr. Jian Liu, School of Engineering Supervisor Dr. Lukas Bichler, School of Engineering Supervisory Committee Member Dr. Dimitry Sediako, School of Engineering Supervisory Committee Member Dr. Liwei Wang, School of Engineering University Examiner Dr. Douglas Ivey, Dept. Chemical/Materials Engineering, University of Alberta External Examiner iii Abstract Lithium-ion batteries (LIBs) are promising energy storage systems for electric vehicles (EVs) and hybrid electric vehicles (HEVs). However, to meet the requirements for EVs and HEVs, the performance of commercially available LIBs needs to be greatly improved in energy density, cycling life, rate capability, and safety. It is well known that the LIB performance is highly dependent on the choice of electrode materials. Therefore, it is essential to develop new electrode materials as replacements for graphite anode used in commercial LIBs to achieve high-performance LIBs desirable for EV and HEV applications. Among all potential alternatives to graphite anode, Si-based materials are considered one of the most promising anodes due to their superior gravimetric capacity (4200 mAh g-1) and moderate discharge voltage. However, Si electrodes face several challenging issues, such as large volume changes, thick solid electrolyte interphase (SEI) layer, and electrode swelling. …
has type: Thesis/Dissertation
date issued: 2022-02
is shown at: 10.14288/1.0403788
language: eng
degree discipline: Mechanical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Liu, Jian
type: Text
identifier URI: http://hdl.handle.net/2429/80235