Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/48331
Title: Towards high-energy and high-power density lithium-rich cathode materials for future lithium-ion batteries: exploring and understanding mechanisms and role of transformation
Authors: SONG BOHANG
Keywords: Li-rich layered cathodes, doping, surface treatment, phase transformation, electrochemistry, Li-ion batteries
Issue Date: 16-Aug-2013
Source: SONG BOHANG (2013-08-16). Towards high-energy and high-power density lithium-rich cathode materials for future lithium-ion batteries: exploring and understanding mechanisms and role of transformation. ScholarBank@NUS Repository.
Abstract: Developing high-energy and high-power density cathode materials for next-generation lithium ion batteries is important and urgent because of high demand of long lasting power sources, such as portable devices, power tools and electric vehicles. In addition to the cathode materials developed in the past two decades, a new family of Li-rich layered cathodes has received great interests due to their high theoretical and reversible capacities. However, several drawbacks still gap them from real applications, for instance first irreversible capacity loss, poor rate capability and voltage decay during electrochemical cycling. To conquer these critical issues, this study firstly focuses on exploring the mechanisms behind the voltage decay which is highly associated with inevitable phase transformation in local structure. To solve this issue, a doping strategy taking advantages of cation ions is proposed to slow down the progress of this phase transformation. Furthermore, inspired by a positive aspect on rate performance as a result of serious transformation, several surface modification strategies are proposed to enhance the rate capability of the Li-rich layered cathodes.
URI: http://scholarbank.nus.edu.sg/handle/10635/48331
Appears in Collections:Ph.D Theses (Open)

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