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National Chung Hsing University Institutional Repository - NCHUIR > 理學院 > 奈米科學研究所 > 依資料類型分類 > 碩博士論文 >  摻雜奈米級氧化鋁顆粒對於固態電解質之鋰電池研究

Please use this identifier to cite or link to this item: http://nchuir.lib.nchu.edu.tw/handle/309270000/152993

標題: 摻雜奈米級氧化鋁顆粒對於固態電解質之鋰電池研究
The Study of Lithium Ion Battery Prepared by Aluminum Oxide Nano-particle Doped Solid Polymer Electrolyte
作者: 鄭子昌
Cheng, Tzu-Chang
Contributors: 斯頌平
奈米科學研究所
關鍵字: 固態電解質;鋰電池
solid electrolyte;lithium battery
日期: 2012
Issue Date: 2013-11-18 11:42:59 (UTC+8)
Publisher: 奈米科學研究所
摘要: 本實驗以高分子Polyethylene oxide與鋰鹽LiClO4以[EO]/[Li]=10之比例混合成固態電解質,之後再摻雜不同重量比的Al2O3奈米顆粒。我們用X-ray繞射(XRD)、熱重量分析(TGA)、熱示差掃描卡量計(DSC)量測固態電解質的物性。從XRD量測顯示,摻雜Al2O3可抑制高分子的結晶相,而以摻雜5% Al2O3抑制最為明顯。在DSC結果發現,高分子結晶區域越小,其熔點溫度越低。再用交流阻抗分析儀量測離子導電率,從交流阻抗的量測發現摻雜5% Al2O3電解質在30oC時導電率可達10-5(Ωcm)-1。用循環法安法量測電解質,摻雜Al2O3的分解電壓會從4.4V提升至4.8V。電池以LiFePO4當作正極、摻雜Al2O3固態電解質及鋰金屬當作負極製作而成,在70oC環境中摻雜5%Al2O3固態電解質放電電容量可達130mAhg-1(C/3)。電池經過多次充放電後,藉由阻抗分析可得知摻雜Al2O3會抑制SEI膜的生長。
In this study, the solid-state electrolytes which mixed with polyethylene oxide LiClO4 and different weight ratio of Al2O3 nano-particles were prepared. X-ray diffraction (XRD), Thermal gravimetric analysis (TGA) and Differential scanning calorimeter (DSC) were used to characterize the physical properties of the solid electrolytes. XRD measurements indicate that doping Al2O3 inhibits the formation of polymer crystalline phase. The inhibition is most obvious for sample doped with 5% Al2O3. The DSC results show that the melting points of the Al2O3 added electrolytes decrease initially and then increase as the content of Al2O3 increases. This may due to the change of the crystalline particle size of polyethylene oxide, which becomes smaller initially as Al2O3 is added, and then becomes larger as more Al2O3 is added. The highest ionic conductivity of the electrolyte at 30oC is 10-5 (Ωcm) -1 for sample doped with 5% Al2O3. Battery using LiFePO4 as a cathode and lithium metal as an anode was prepared. The discharge capacity, using C/3 discharge rate, up to 130mAhg-1 is obtained at 70oC. AC impedance analysis indicates an inhibiting growth of the solid electrolyte interphase by adding Al2O3.
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