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The energy density of conventional electric double-layer capacitors is about 6-7 Wh/kg and due to the limited specific capacitance and cell voltage, and a large amount of electrolyte which is required to build a layer of charge of the double-layer. The energy density theory guide clearly shows that the energy density of double-layer capacitors is ultimately limited by how many ions are available in the electrolyte or the salt concentration in the electrolyte.We demonstrate a lithium capacitor which is capable of achieving high energy density over 20 Wh/kg, long cycle life and high power density. The lithium capacitor consists of a battery electrode with lithium intercalated hard carbon anode and a double-layer activated carbon cathode electrode with the open-circuit potential at or near the maximum potential when the cell is fully charged. The stabilized lithium metal powder was applied onto the surface of prefabricated hard carbon anode electrodes.
Activated carbon, Hard carbon, High energy density, Li-ion capacitors, long cycle life, Stabilized lithium metal powder
Date of Defense
March 8, 2013.
A Dissertation submitted to the Department of Electrical and Computer Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Includes bibliographical references.
Jim P. Zheng, Professor Directing Dissertation; Chiang Shih, University Representative; Hui Li, Committee Member; Simon Y. Foo, Committee Member; Petru Andrei, Committee Member.
Florida State University
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