Author: Zhou, Hanmo
Title: Composite structural battery
Advisors: Zhou, Limin (ME)
Degree: M.Sc.
Year: 2020
Subject: Storage batteries -- Materials
Electric batteries -- Electrodes
Electrodes -- Materials
Energy storage
Hong Kong Polytechnic University -- Dissertations
Department: Department of Mechanical Engineering
Pages: xvi, 102 pages : color illustrations
Language: English
Abstract: The multi-functional composite structural battery with load-bearing and energy storage is of great significance for the lightweight of electric product equipment and structure, which is extremely promising for many practical engineering applications. Compared with the traditional lithium-ion battery, the battery studied in this dissertation is mainly composed of two parts. The surface modified carbon fibers are used as the positive and negative electrode materials and reinforcements, and the multifunctional solid polymer is used as the electrolyte and the matrix, eliminating the separator part of the traditional lithium-ion battery. The surface modified carbon fiber electrode materials are relatively easy to realize. The positive active particles can be deposited on the surface of the fiber by electrodeposition to prepare the cathode carbon fiber material, and the anode carbon fiber material can be prepared by synthesizing metal organic frame structure on the surface of the carbon fiber. However, the main difficulty lies in the preparation of solid polymer electrolyte. Due to the opposite relationship between its inherent mechanical properties and ionic conductivity, only the bicontinuous phase polymer electrolyte has relatively good performance at present. In this dissertation, the cathode materials and solid polymer electrolyte of composite battery were studied. For cathode materials, electrophoretic deposition (EPD) of lithium iron phosphate (LiFePO4, LFP) nanoparticles on the surface of carbon fibers has been completed. In addition, considering that the deformation of the carbon fiber electrode material may damage the interface of the composite material in the process of charge and discharge, carbon nanotubes (CNTs) are considered to be grafted on the carbon fiber positive material to enhance the adhesion between the electrode material and the matrix, as well as absorbing part of the deformation of LFP particles. In this dissertation, the grafting of carbon nanotubes on the surface of carbon fiber has been realized by different methods (EPD and chemical vapor deposition). The deficiency is that the structure of the combination of CNTs and LFP particles has not been completed. For solid polymer electrolytes, conductive fillers F127 and PEO were added to epoxy, achieving the improvement of the mechanical properties and ionic conductivity simultaneously. Although the ionic conductivity of materials cannot meet the requirements, the method of adding fillers can partly overcome the contradiction between mechanical properties and electrochemical properties, which is a promising method for further research.
Rights: All rights reserved
Access: restricted access

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