Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Faculty of Engineering | en_US |
| dc.contributor.advisor | Yao, Haimin (ME) | - |
| dc.creator | Xue, Yanwei | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/9075 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | - |
| dc.rights | All rights reserved | en_US |
| dc.title | Mechanics-based investigation of the durability of energy materials | en_US |
| dcterms.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. | en_US |
| dcterms.extent | xiii, 92 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2017 | en_US |
| dcterms.educationalLevel | M.Sc. | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.LCSH | Lithium ion batteries | en_US |
| dcterms.LCSH | Electric batteries -- Electrodes | en_US |
| dcterms.accessRights | restricted access | en_US |
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 |
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