| Author: | Xue, Yanwei |
| Title: | Mechanics-based investigation of the durability of energy materials |
| Advisors: | Yao, Haimin (ME) |
| Degree: | M.Sc. |
| Year: | 2017 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Lithium ion batteries Electric batteries -- Electrodes |
| Department: | Faculty of Engineering |
| Pages: | xiii, 92 pages : color illustrations |
| Language: | English |
| Abstract: | Lithium-ion battery (LIB) is regarded as a type of promising power source for its wide application in transportation, electronics, electric power tools, and so on. The increasing demand for high-performance lithium-ion battery in the industry requires anode materials with high capacity such as silicon (Si). However, the application of silicon as anode material is limited in practice because of the large volume changes (~300-400%) of silicon during lithiation and delithiation process. This might lead to the delamination of the interface between anode materials and current collector (copper foil). In order to solve this problem, here we propose two gradient design of current collector with either gradient stiffness or gradient thickness. Theoretical analysis is carried out first to figure out the current collector with gradient stiffness or with gradient thickness that leads to uniform interfacial shear stress distribution during lithiation. Then the current collector with gradient thickness is fabricated and applied in the lithium-ion battery. The characterization of electrochemical performance shows that the designed gradient-thicknessed current collector gives rise to better performance compared to the uniform-thicknessed one. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 991021962223803411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 4.11 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/9075