開發鋰離子電池之多孔性與高熱穩定性聚醯亞胺隔離膜

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研究生：	張苑芝 Yuan-Chih Chang
論文名稱：	開發鋰離子電池之多孔性與高熱穩定性聚醯亞胺隔離膜 Development of a highly porous and thermal stable polyimide separator for lithium-ion batteries
指導教授：	吳溪煌 She-Huang Wu 黃炳照 Bing-Joe Hwang 蘇威年 Wei-Nien Su
口試委員:	黃炳照 Bing-Joe Hwang 吳溪煌 She-Huang Wu 蘇威年 Wei-Nien Su 姚松廷 Song-Ting Yao 葉昀昇 Yun-Shen Ye
學位類別：	碩士 Master
系所名稱：	應用科技學院 - 應用科技研究所 Graduate Institute of Applied Science and Technology
論文出版年：	2022
畢業學年度：	110
語文別：	中文
論文頁數：	108
中文關鍵詞：	鋰離子電池、聚醯亞胺、隔離膜、非溶劑誘導相轉移、克伏拉纖維
外文關鍵詞：	lithium-ion battery, polyimide, separator, nonsolvent inversion phase separation, Kevlar fibe
相關次數：	點閱：203 下載：0
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上一筆

本研究以簡易的非溶劑誘導相轉移的方式製成多孔性和高熱穩定性的聚醯亞胺隔離膜，為讓隔離膜保有一定的機械因此以高固含量的PAA溶液(20 wt%)作為澆鑄溶液，同時探究出以具有孔洞的隔膜(Celgard2325)作為新型刮塗基材以解決底面無法生成孔洞的問題。並嘗試以添加具有大量氫鍵及醯胺官能基的克伏拉纖維的方式以不影響結構穩定性的方式進行表面改質，同步改善部分孔洞問題。
所製備出的聚醯亞胺隔離膜與Celgard 2325隔離膜相比具有優異的熱穩定性、高達66.4 %孔隙率、在電解液吸附量上更達178.8 %及穩定的電化學穩定性。經過改質的隔離膜在潤濕性上的表現更加提升，尤其是在電化學穩定性上更為明顯，在LiPF6 (in EC/DEC=1:1, V/V) LFP/Li 的系統中以0.5C的充放電條件下進行長圈數循環充放電，歸因於多孔性的結構及高潤濕性的特性在經過40圈的循環下仍有98.7 %的庫倫效率及99.9 %的電容保持率。

A high porous and high thermal stable polyimide separator has been successfully prepare by nonsolvent inversion phase separation process.In the study, we used the Celgard 2325 membrane as a casting substrate to solve the issue where the high solid content slurry is hard to form a porous structure. In addition, we added Kevlar fiber, which has many hydrogen bonds and amide functional groups, to modify and solve some structure problems.
The PI separator has shown excellent properties for lithium ion batteries. Compared with the commercial Celgard 2325 separator, our PI separator shows excellent thermal stability, up to 66.4 % high porosity, and 178.8 % in electrolye uptake and stable electrochemical performance.The modified one, Kevlar/PI separator, exhibits better wettability and excellent electrochemical performance than PI.The battery coin cell assembled with Kevlar/PI in LiPF6 (in EC/DEC=1:1, V/V) LFP/Li system and using 0.5 C for long charge and discharge cycles.The cell shows the excellent performance. After 40 cycle it still has coulombic efficiency of 98.7 % and 99.9 % retention capacity.

摘要    I
Abscract    II
致謝    III
目錄    V
圖目錄    VIII
表目錄    XII
第1章 緒論    1
1 前言    1
2 鋰離子電池    2
3 鋰離子電池反應機制和組成    3
3.1 鋰離子電池的反應原理    3
3.2 電池組成    4
4 隔離膜特性需求    7
4.1 機械性質    1
4.2 厚度    1
4.3 熱與尺寸穩定性    1
4.4 孔隙度、孔洞分布    2
4.5 潤濕性    2
4.6 離子傳導率    3
4.7 化學及電化學穩定性    4
5 隔離膜的種類及製造方式    5
5.1 隔離膜種類    5
5.2 隔離膜的製程工藝    6
5.3 傳統商用隔離膜的困境    9
6 聚醯亞胺(PI)隔離膜    10
6.1 聚醯亞胺特色    10
6.2 選擇聚醯亞胺作為隔離膜    11
7 研究動機及目的    12
第2章 文獻回顧    13
1 製備多孔性隔離膜的方法    13
1.1 靜電紡絲    13
1.2 非溶劑誘導相轉移分離 (NIPS)    16
1.3 犧牲模板法    17
1.4 相分離微成型技術    21
2 影響非溶劑誘導相轉移製程多孔隔離膜的因素    23
2.1 非溶劑凝固浴的選擇    23
2.2 高分子濃度的選擇    25
2.3 溫度的選擇    26
3 多孔性隔離膜改質    29
4 克伏拉纖維之特性    36
第3章 實驗方法與設備    40
1 實驗藥品    40
2 實驗設備    42
3 實驗步驟    43
3.1 製備聚醯亞胺溶液    43
3.2 製備克夫拉纖維    43
3.1 製備聚醯亞胺混合克夫拉纖維溶液    44
3.2 製備聚醯亞胺隔離膜    46
4 材料鑑定、分析與原理    48
4.1 傅立葉紅外線光譜儀 (FTIR)    48
4.2 掃描式電子顯微鏡 (FE-SEM)    48
4.3 拉力試驗機(Tensile testing)    49
4.4 接觸角(Contact angle)    49
5 電化學性質測試    50
第4章 結果與討論    52
1 聚醯亞胺薄膜製程之探討    52
1.1 以玻璃為基板之薄膜形貌分析    52
1.2 以玻璃為基板之薄膜物性比較    54
2 以Celgard2325為基板製模    55
2.1 以Celgard2325為基板之薄膜形貌分析    56
2.2 以Celgard2325為基板之薄膜物性比較    57
3 聚醯亞胺隔離膜之探討    58
3.1 傅立葉轉換紅外線光譜結構鑑定    58
3.2 膜形貌分析    59
3.3 膜熱穩定性質    61
3.4 膜之機械拉伸性質    63
3.5 膜之孔隙率及潤濕性    64
3.6 膜的阻抗、離子電導率及界面阻抗    67
3.7 小結    69
4 聚醯亞胺隔離膜改質之探討-克伏拉/聚醯亞胺隔離膜    70
4.1 膜的形貌分析    70
4.2 膜熱穩定性質    71
4.3 膜之機械拉伸性質    73
4.4 膜之孔隙率及潤濕性    74
4.5 膜的阻抗、離子電導率及界面阻抗    75
4.6 鋰離子電導率    77
4.7 小結    79
5 電池效能分析    80
第5章 結論    82
第6章 未來展望    83
參考文獻    84


                                

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全文公開日期 2027/08/24 (校內網路)
全文公開日期 2027/08/24 (校外網路)
全文公開日期 2027/08/24 (國家圖書館：臺灣博碩士論文系統)

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