聚丙烯睛複合高分子電解質之製備與性質之研究

在本研究中製備出一系列具有優異導電度及機械性質良好以PAN (polyacrylonitrile)為主體添加α-Al2O3的複合高分子電解質，並探討a-Al2O3的添加對於PAN高分子電解質的影響。由導電度的結果，可得知所製備的複合高分子電解質在添加7.5wt% α-Al2O3及F=0.6 LiClO4組成下在30℃之導電度可達5.7×10-4S/cm，此導電度在已知固態電解質系統中為最高的值。同時利用傅立葉紅外線光譜儀(FTIR)、鋰固態核磁共振儀(7Li-NMR)、示差掃瞄卡計(DSC)、Powder X-ray diffractometer等儀器研究所製備之複合高分子電解質中各成分間的作用力及可能的導電機構。由以上實驗結果顯示，鋰離子的傳導主要並不是依靠高分子鏈的運動而移動而是藉由α-Al2O3的表面提供的”hopping sites”來傳導。在機械性質測試結果顯示，此複合高分子具有相當高的屈服強度(yield stress )(73kg/cm2) 及屈服拉伸率(yield elongation)(225%)，適合充當電池的隔離膜且能與電極緊密接觸。此外，亦利用SEM-EDX探討複合高分子電解質的表面型態及α-Al2O3在電解質中分散之均勻度。

關鍵字

三氧化二鋁；鋰二次電池；固態高分子電解質；聚丙烯睛

並列摘要

In this study, a series of novel solid-typeα-Al2O3 containing PAN-based composite polymer electrolyte (CPE) with high mechanical strength and high conductivity at room temperature has been prepared. The effect of the addition ofα-Al2O3 on the properties of the PAN-based composite polymer electrolyte has been analyzed. The best conductivities obtained at room temperature is 5.7×10-4 Scm-1 from the CPE with 7.5 wt%α-Al2O3 and 0.6 LiClO4 per PAN repeat unit which is the highest reported for non-gel type solid polymer electrolytes and reaches to the value can be used in rechargeable batteries. Also discussed are the interactions existing in the system and the possible conductivity mechanism by the results of FT-IR spectroscopy, solid state Li-NMR, DSC measurement and XRD diffraction pattern. It is suggested that during conduction the Li+ cations are transported mainly by hopping over the dispersedα-Al2O3 particles. In addition, the mechanical property data indicate that the membranes prepared possess good high yield stress suitable for serving as separators in the solid-state lithium and lithium ion batteries and high yield elongation pliable to form good interface with electrodes.

並列關鍵字

Al2O3 ； polyacrylonitrile ； Lithium Secondary Batteries ； solid polymer electrolyte

參考文獻

5. Y. Matsuda, “Stable Electrolytes for Lithium Batteries”, J. Power Source, 20,19 (1987)

6. Y. Matsuda, M. Merita and K.Kosaka“ Conductivity of the Mixed organic Electrolyte Containing Propylene Carbonate and 1,2-Dimethoxyethane”, J. Electrochem. Soc., 130,10 (1983)

7. K. M. Abraham “Application of Electroactive Polymers”, Edited by B. Scrosati, Chaptan & Hall, London, Chap.3, 1993

8. H. Hung “Studies on PAN-based lithium Salt complex” Electrochim Acta, 37, 1671 (1992)

9. S. Hossian, in Handbook of Batteries, Edited by D. Linden, McGraw-Hill, New York, Chap. 36 (1995)

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聚丙烯睛複合高分子電解質之製備與性質之研究

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