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標題: | 新型態帶有磺酸鋰側鏈之五嵌段共聚高分子:合成及其在鋰金屬電池之應用 Novel Pentablock Copolymers Bearing Pendant Lithium Sulfonates: Synthesis and Its Application in Lithium Metal Batteries |
作者: | Yi-Ling Liu 劉怡伶 |
指導教授: | 趙基揚(Chi-Yang Chao) |
關鍵字: | 五嵌段共聚高分子,陰離子聚合法,單離子導體,鋰金屬電池,鋰金屬保護層,鋰金屬枝晶, Pentablock Copolymer,Anionic Polymerization,Single-Ion Conductor,Lithium Metal Batteries,Protective Layer,Lithium Dendrite, |
出版年 : | 2018 |
學位: | 碩士 |
摘要: | 本研究以陰離子聚合法及後續的官能基修飾開發新型態ABCBA五嵌段共聚高分子以作為鋰金屬負極及微孔隔離膜Celgard 2320之間的保護層,目的為提升鋰金屬電池的穩定性與安全性。在五嵌段共聚高分子中,A嵌段為具有單離子導體特性的磺酸化聚異戊二烯,懸垂於側鏈的高密度磺酸鋰負責鋰離子傳導,單離子導體特性可以抑制鋰枝晶成長;B嵌段為柔軟的聚異戊二烯,用以提供膜材所需彈性;C嵌段為剛硬的聚苯乙烯,用以提供膜材所需機械強度及尺度穩定性;又由於高分子鏈兩端皆為磺酸化聚異戊二烯,磺酸鋰間強烈的庫倫作用力會使A嵌段產生物理交聯,可更進一步提升膜材的機械強度以抵擋鋰枝晶成長。利用溶劑揮發法可製備出厚度小於20μm的獨立薄膜。材料鑑定首先進行薄膜的熱性質、微結構、機械強度及表面特性等分析以了解此材料的基本特性,接著進行電化學性質量測,最後組裝成以磷酸鋰鐵為正極、鋰金屬為負極的鈕扣型電池進行充放電測試,評估將此五嵌段共聚高分子作為鋰金屬電池之鋰金屬負極保護層的潛質。 A novel ABCBA pentablock copolymer is synthesized via anionic polymerization and the following functional group conversion to serve as a non-porous protective layer for lithium metal anode in lithium metal batteries located between the lithium metal anode and the mesoporous separator Celgard 2320. Within the pentablock copolymer, segment A is a single-ion conductor containing pendant lithium sulfonate group (-SO3Li) for the purpose of lithium ion transportation and of the suppression of lithium dendrite; segment B is flexible polyisoprene to provide the membrane with flexibility; while segment C is rigid polystyrene offering the membrane mechanical strength and dimensional stability. In addition to the above transport and mechanical properties achieving by each segment, strong ionic interaction between the terminal lithium sulfonate groups of the two A segments enabling physical crosslinking would further enhance the mechanical strength for blocking lithium dendrite growth. Free standing membranes with thickness less than 20μm are prepared by solvent-casting method. Microstructure as well as mechanical, thermal and surface properties of the membranes are studied. Electrochemical properties and charge-discharge tests are also performed to evaluate the potential of the pentablock protective layer for lithium metal anode in lithium metal batteries. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/70574 |
DOI: | 10.6342/NTU201802924 |
全文授權: | 有償授權 |
顯示於系所單位: | 材料科學與工程學系 |
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