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

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