| 研究生: |
黃莉玉 Huang, Li Yu |
|---|---|
| 論文名稱: |
聚丙烯腈結合多醚基高分子為主架構之膠態電解質在鋰離子電池之應用 Polyacrylonitrile Incorporated with Ether-Abundant Polymers as the Gel-Electrolyte Framework for Lithium Ion Batteries |
| 指導教授: |
鄧熙聖
Teng, Hsisheng |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 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: | 86 |
| 中文關鍵詞: | 鋰離子電池 、聚丙烯腈 、醚基 、膠態高分子電解質 |
| 外文關鍵詞: | Lithium ion battery, gel polymer electrolyte, polyacrylonitrile |
| 相關次數: | 點閱:114 下載:12 |
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本研究以聚丙烯腈為主架構,藉接枝上poly(propylene oxide) diamines (D2000),使之交聯上poly(ethylene glycol) diglycidyl ether(PEGDE)改質形成含多醚基高分子,簡稱為PMP。藉電紡絲方法製備之高分子薄膜浸泡於有機電解液中4小時,即可得到膠態高分子電解質(GPMP),同時與之相比較之系統尚有未改質前之GPAN與液相電解液(LE,以PP膜作為隔離膜)。將GPMP與另兩種電解質進行電池組裝測試其性能,並比較分析GPMP之優勢。
由NMR鑑定GPAN官能基並確認D2000確實接上PAN形成GPMP。接著藉由拉曼分析、電化學穩定電位窗、導離子度與鋰離子遷移常數分析了解,負離子(PF6-)應受到高分子吸引而與高分子形成較為穩定之複合物,而鋰離子則由於含多醚基官能基,使其在GPMP系統中躍遷較為容易,提升了導離子度以及鋰離子遷移常數(0.65)。接著由全電池阻抗分析以及全電池壓降分析,可以得知GPMP系統皆表現較低之阻力值,此結果肇因於高分子對於負離子的箝制以及對鋰離子傳遞的幫助,並與電極表現出較佳之相容性。
GPMP電池性能使用磷酸鋰鐵陰極搭配介相碳微球陽極組裝成全電池測試,比較GPMP、GPAN與LE的差異。在高速充放電(17 C-rate)時,LE與GPAN表現衰退僅剩44%與60%。相較之下,GPMP還保有75%之維持率,並擁有97.4 mAh/g之高放電量。在高速(5 C-rate)長效穩定性測試方面,進行500圈長效充放電測試後,GPMP與GPAN全電池的穩定分別維持73%與71%,且一千圈後,GPMP系統仍有維持率約61%,電容量為75 mAh/g,表4-2 整理近年全電池文獻,可更清楚瞭解本研究之表現。
This study reports a gel polymer electrolyte (GPE) that is synthesized using Poly(acrylonitrile-co-methyl acrylate) (PAN) to construct the body frame and serve as mechanical property source. To promote the lithium ion motion, PAN first reacted with poly(propylene oxide) diamines (D2000) to substitute methyl acrylate groups and graft D2000 onto main chain, then crosslinked with poly(ethylene glycol) diglycidyl ether(PEGDE) to form PMP polymer matrix. After swelling with LE the resulting gel-type of PMP (GPMP) exhibited excellent ionic conductivity, mechanical integrity, thin-film feasibility, and chemical stability.
With SEM, NMR, Raman, linear scan voltammetry, ionic conductivity and transference number tests, we can identify the structure of polymer and depict the interactions between electrolyte and polymer. By incorporating GPMP with a mesocarbon microbeads (MCMB) anode and a LiFePO4 cathode, we developed a full-cell LIB that delivered energy at high speeds (17 C) and exhibited excellent capacity retention with long-term cycling at 5 C. To better understand the good performance in full cells, AC impedance test was applied to measure the impedance of full cell before activation, after activation and after full charge-discharge program. The analysis leads to lower SEI layer resistance and charge transfer resistance of GPMP compared to GPAN. Higher compatibility toward electrodes and large transference number of Li+ ions (0.65) of GPMP were primarily responsible for the outstanding performance of the resulting LIB. For comparison, the gel-type PAN (GPAN) and liquid phase with Celgard separator were also tested under the same condition.
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