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Study on Crystallization Behavior and Structure of PEO/LiClO4 Blends

Author: ZhangYao
Tutor: JiangShiChun
School: Tianjin University
Course: Materials Science
Keywords: Polyoxyethylene Lithium perchlorate Crystallization Behavior Crystal structure Structural changes
CLC: O631.3
Type: Master's thesis
Year: 2010
Downloads: 34
Quote: 0
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Abstract


An ether group of the polyethylene oxide (PEO) group having a lone pair of electrons, and having a very strong polarization of the ability to easily and metal ions to form complexes, making poly (ethylene oxide) to become a very good polymer solid electrolyte material. Lithium metal is not only strong electropositive density, ease of manufacturing materials with high energy storage density. These advantages make the solid polymer electrolyte based on PEO and lithium salts (LiX) a cause of great concern. But the current understanding of the structure of this polymer electrolyte system is not many, however, the knowledge and understanding of its structure to improve ion transmission speed to improve the conductivity of the solid polymer electrolyte system is crucial. In this thesis, the use of polarized light microscopy, Fourier transform infrared spectroscopy, showing differential scanning calorimetry and synchronous radiation small-angle X-ray technology PEO and the PEO / LiClO 4 system crystalline structure, crystallization behavior, and so on isothermal crystallization process of the structure changes. PEO spherulitic morphology showing typical type of Malta and has fine spherulites the weave state structure, adding LiClO 4 after spherulitic morphology of PEO spherulites morphology showed feathery. Found through research LiClO 4 Growth Kinetics of PEO spherulites joined LiClO 4 after PEO spherulite diameter with changes in temperature and crystallization time and pure PEO linear increased, but under the same crystallization temperature spherulite growth rate. By comparison, the LiClO 4 added makes PEO isothermal crystallization process spherulite growth rate decreased significantly. The study showed that the addition of LiClO 4 the PEO spherulite growth kinetics speed decreased. The structural parameters of the sample, such as a long cycle, the correlation function of the lamellar thickness and the thickness of the amorphous layer through a one-dimensional electron density on the SAXS results calculated. The calculation results show that the PEO long cycle isothermal crystallization process basically does not change with time and change, lamellae thickness increases with temperature and crystallization time increases showed increased amorphous layer thickness decreases; to join LiClO 4 structural parameters after PEO such temperature crystallization process with the time of change and the pure PEO phase consistent long cycle substantially do not change with time and changes; compared to the pure PEO, a lithium salt is added in the same crystallization temperature PEO such temperature crystallization of the long cycle becomes small. Fourier transform infrared spectroscopy showed that not only the isolated ion Li system in the PEO / LiClO , ClO4-, the same time as Li and ClO , 4 - strong coordination between the role as well as contact ion pairs exist. Can be seen from the peaks of the IR spectra analysis Li and PEO ether oxygen bond there is interaction between the role of the destructive role of PEO.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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