研究生: |
廖禮葳 Lee-Wei Liao |
---|---|
論文名稱: |
鋰離子電池新型添加劑之合成及其應用 Synthesis and Applications of New Additives for Lithium Ion Batteries |
指導教授: |
黃炳照
Bing-Joe Hwang |
口試委員: |
江志強
Jyh-Chiang Jiang 蘇威年 Wei-Nien Su 陳景翔 Ching-Hsiang Chen |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2014 |
畢業學年度: | 102 |
語文別: | 中文 |
論文頁數: | 160 |
中文關鍵詞: | 碳酸丙烯酯 、共遷入 、高分歧化聚合物 、固體電解質界面 、熱穩定性 |
外文關鍵詞: | Propylene carbonate, Cointercalation, Hyper branch polymer, SEI layer, Thermal stability |
相關次數: | 點閱:278 下載:8 |
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本研究開發兩種不同功能添加劑之應用 (一)抑制PC電解液於充放電過程中與鋰離子共遷入碳材電極中之現象,並使電池能有效運作。(二)高分歧化聚合物(Hyper branched Polymaleimide, HBPM)應用於鋰離子電池陰極之熱穩定型添加劑。
根據理論計算,研發出可抑制PC電解液於充放電過程中與鋰離子共遷入碳材材料電極中之現象之新型添加劑。當添加量為2wt.%時,能有效抑制共遷入現象,並維持穩定有效率的充放電。當添加量為1wt.%時,無法有效阻止共遷入現象,電池無法正常運作。而當添加量超過5wt.%以上,雖然能夠有效抑制共遷入現象,讓電池能順利進行充放電,卻無法維持穩定的電容量。
HBPM 經過電化學程序後,會於陰極材料鋰鈷氧(LiCoO2)表面上形成固態電解質介面(solid electrolyte interface,SEI ),此新的SEI層能有效提升原本鋰鈷氧於電池系統中的熱穩定性及安定性;此外,藉由將HBPM上未與maleimide反應之OH官能基與小分子Acyl chloride反應,電化學表現有了好的改善;由DSC結果測試,熱裂解溫度及放熱量皆隨著HBPM的導入而延遲。
In this work, the development of two different additives serving differing functions were fabricated and investigated.。(I) The inhibition of the co-intercalation of PC solvent with Li-ions into graphite electrode allowing for practical use within a PC-solvent containing battery system。(II) Hyper branched polymaleimide (HBPM) used as an cathode additive to alleviate thermal runway。
Based on criteria established by theoretical calculations, new additives were fabricated to inhibit PC solvent and Li ion co-intercalation into graphite electrode during the charge and discharge process. The addition of 2 wt% of the additives can effectively suppress the co-intercalation phenomenon maintain stable charge/discharge while the addition of only 1wt.% showed relatively poor performance and stability . With the addition of more than 5wt.%, there is adequate suppression of the co-intercalation phenomenon but a reduction of stability occurs.
After electrochemical cycling, HBPM forms as a new SEI layer on the surface of lithium cobalt oxide, which enhances the thermal stability and reduction of exothermic reactions of lithium cobalt oxide in the battery system as evidenced by DSC. In addition, the use of Acyl chloride to reduce the OH functional groups of the maleimide shows to have greatly enhanced the electrochemical performance and stability during battery operation.
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