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Preparations of Polymer Electrolytes and Their Applications in Polymer Li-ion Battery

Author: PuJinDan
Tutor: AiXinPing
School: Wuhan University
Course: Physical and chemical
Keywords: Polymer lithium ion battery Polymer electrolyte Situ polymerization Polyacrylate electrolyte
CLC: TM912
Type: Master's thesis
Year: 2005
Downloads: 396
Quote: 7
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Abstract


Polymer lithium-ion battery not only has a high energy density, long cycle life and pollution, etc., and compared with the conventional liquid lithium-ion battery, with better security and appearance design flexibility. Polymer lithium ion batteries become nearly a decade chemical power research and development focus. Although lithium ion polymer batteries have started to scale production, but there are still needs further technical problem, mainly: (1) the mechanical strength of the polymer electrolyte is poor and can not meet the requirements of the actual application; (2) Battery Manufacturing The process involves plasticized film, thermal compound, extracted a very cumbersome process, the process is quite complex. In this thesis, launched a research problem for these applications in polymer lithium-ion battery existing main results are: using porous polypropylene film (celgard2300) matrix containing the appropriate polymer solution prepared its dipping high The strength of the composite polymer electrolyte membrane, and membrane structure and electrochemical properties of the viscosity of the polymer solution and the component content (polymer, plasticizer, nano-additives). The study shows that, compared with ordinary plastic polymer electrolyte membrane, the composite electrolyte membrane having high mechanical strength, a small deformation resistance, and high electrical conductivity (ionic conductivity at room temperature up to 4 * 10 -3 / cm ), to meet the practical application of polymer lithium-ion battery needs; proposed order to simplify the process of preparation of polymer lithium-ion battery, the thermal initiation site polymerization polymer lithium ion battery technology. Compared with the existing polymer battery manufacturing process, in situ polymerization method process is simple, easy to control and features more suitable for polymer lithium ion battery industrialization production; 3. Situ polymerization prepared polyacrylate electrolyte and The structure and electrochemical properties were investigated. The results show that: the polymer electrolyte electrochemical stability window of 4.5V, high room temperature conductivity and good low temperature performance, a new polymer electrolyte system has a good application prospect. Current drive precursor solution in the electrolyte content of 85%, the room temperature conductivity of 3.2 × 10 -3 S · cm -1 , -20 ℃ the conductivity 5.6 × 10 -4 S · cm -1 ; 4. situ polymerization technique to prepare polymer battery, and examine its performance. The results indicate that the electrochemical properties of the polymer batteries with liquid lithium-ion battery is basically the same. Its initial charge and discharge efficiency was

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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