|Carbon fiber composite structure battery
|Zhou, Limin (ME)
|Hong Kong Polytechnic University -- Dissertations
|Faculty of Engineering
|xii, 119 pages : color illustrations
|With the rapid development in aerospace, military and transport fields, higher requirements for structure design are proposed, which are lightweight structures and multifunctional materials. Multifunctional design for load bearing components is the vital factor to realize weight reduction. Structural battery is the unity of battery and structural materials, which combines the load bearing and energy storage functions into one material entity. Using a structural battery, the total mass of the system performing these two functions should be lower than the cumulative mass of the battery pack and the structure component. It is of great significance, and also the aim of this research, to explore the fabrication and material design of the structural battery, and to investigate the mechanical and electrochemical performances. This research was performed from the following aspects: Novel electrolyte and electrode materials have been developed to optimize both electrochemical and mechanical properties in this study. Co-continuous solid electrolytes are being formulated to achieve necessary mechanical strength while enabling ionic conductivity. Epoxy was directly blended with liquid electrolyte and in situ cured to form the co-continuous structural electrolyte, with separate structural and conductive phases to bear load and transfer ions, respectively. The mechanical performance and ionic conductivity of the structural electrolytes had a trade-off relationship with the increase of liquid electrolyte/epoxy mass ratio. Structural carbon cathode materials coated on carbon substrates have been developed as electrode components. Charge/discharge cycling, CV and EIS were used to evaluate electrochemical performance of the electrode materials, and bending tests were used to evaluate their mechanical properties. Several different structural anode materials were fabricated and investigated as well. Mechanical and electrochemical tests have been carried on the optimize the properties of the anodes material. The morphology of different anode materials was also investigated in the paper. VARI technology was used to fabricate the carbon composites.
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