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Electrochemical Performance and Preparation of Electrospun PVDF/PMMA Membranes for Lithium Ion Battery

Author: LiXiaoYun
Tutor: CaoZuo
School: Xiangtan University
Course: Physical and chemical
Keywords: Polyvinylidene fluoride Poly ( methyl methacrylate ) Polymer electrolyte Electrospinning Lithium ion battery
CLC: TM912
Type: Master's thesis
Year: 2011
Downloads: 155
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Abstract


In the era of rapid development of the electronics industry, the lithium-ion battery, has the advantages of high energy density, high voltage, low self-discharge rate, wide temperature range, which is widely used in mobile phones, military, and wireless communications equipment and many other areas and toward the development of intelligence, miniaturization, environmental protection direction. Polymer lithium ion batteries as a new generation of lithium-ion batteries, the use of the polymer electrolyte instead of a liquid electrolyte, there is no leakage and other safety issues, and the use of aluminum-plastic film packaging, greatly improve the flexibility in the design of the battery, and thus become a lithium ion battery is an important research direction. This article was prepared using electrostatic spinning fiber membrane of polyvinylidene fluoride / polymethyl methacrylate (PVDF / PMMA), their preparation process and the physical and electrochemical properties were studied. The main content of the following aspects: First, the preparation of the different concentration of the polymer solution, the application prepared by electrospinning three typical morphology of PVDF / PMMA composite fiber membrane and PVDF / PMMA composite fiber membrane electrospinning parameters selection discussed. Using scanning electron microscopy (SEM), infrared spectroscopy (FTIR), differential scanning calorimetry method (DSC), porosity, fluid absorption rate and conductivity testing means the analysis and characterization of PVDF / PMMA composite fiber membrane. The results showed that: a concentration of 16 wt.% Polymer solution was prepared composite fiber membrane fiber distribution, with good electrochemical stability, and its ionic conductivity at room temperature is the highest, reached 3.5 × 10 -3 S / cm. Next, change the mass ratio of PVDF and PMMA, the electricity spinning Preparation of PVDF and PVDF / PMMA fiber membrane. Were analyzed and characterized by means of SEM, FTIR, XRD, conductivity, interface stability test fiber membrane. PVDF / PMMA (8/2) assembly for polymer electrolyte Li / LiFePO 4 battery, and a constant current charge-discharge performance test. The results showed that: PMMA and PVDF can be blended under the conditions of the different mass ratios; PVDF / PMMA composite fiber membrane having a high ion conductivity, good electrochemical stability; PVDF / PMMA (8/2) having a low degree of crystallinity high pipette rate and conductivity; PVDF / PMMA (8/2) for polymer electrolyte Li / of LiFePO 4 battery the first time when the 0.1C discharge capacity up to 153.3 mAh / g, the battery showed good cycle performance. Finally, through the precursor of titanium dioxide (TiO 2 ) in the polymer solution was added, using the electro-spinning method prepared polyvinylidene fluoride / polymethyl methacrylate / TiO 2 (PVDF / PMMA / TiO 2 ) composite fiber membrane. Means of SEM, FTIR, DSC, and conductivity test analysis and characterization of the fiber membrane. The results showed that: situ generated TiO 2 can be uniformly dispersed in the fiber membrane; PVDF / PMMA / TiO 2 composite fiber membrane having a low degree of crystallinity, good electrochemical stability, room temperature ionic conductivity as high as 3.87 × 10 -3 S / cm.

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