臺灣博碩士論文加值系統

本研究使用的磷酸鋰鐵正極材料，其缺點為導電性較差及高溫循環特性衰退快速。故本研究探討在電解液中添加硼烷基系的添加劑，以改善磷酸鋰鐵正極材料的高溫循環性能，以及磷酸鋰鐵電極表面形成SEI膜對於鋰離子傳輸的效應影響。硼烷基系的電解液添加劑是一種陰離子接受體，可促使LiPF6離子對解離提高電解液的離子傳導性。此外，也減少了磷酸鋰鐵電極表面形成的SEI膜中LiF含量，以改善鋰離子傳輸的問題，提升鋰離子電池的循環性能。研究結果顯示，使用有添加硼烷基系添加劑的電解液，確實有助於改善磷酸鋰鐵正極材料在60℃時的循環特性。此外，經由EIS分析可以發現使用一般電解液的磷酸鋰鐵電極，其60℃循環測試後阻抗明顯地增加。藉由SEM和FTIR的儀器分析發現，使用一般電解液的磷酸鋰鐵電極表面形成一種結構複雜的鈍化層，然而使用有添加硼烷基系添加劑的電解液卻沒有這類狀況，這種結構複雜的鈍化層正是增加電極阻抗，導致循環特性快速衰退的主因。由此可證實，硼烷基系的電解液添加劑確實有效改善磷酸鋰鐵正極材料的高溫循環特性。

LiFePO4 is one of the novel cathode materials for lithium ion batteries. It has various advantages including high power capability, excellent cycling performance and low cost, but LiFePO4 material shows poorly electrical conductivity and cycle fading quickly at high temperature. Herein, this report has investigated a boron alkyl-based compound as an electrolyte additive. These results show an obvious improvement of high temperature cycle performance for LiFePO4 cathode material duo to a special SEI film formed on electrode surface. Boron alkyl-based additive is one of the anion receptors. It is able to increase the dissociation of LiPF6 in electrolyte. Thus it decreases LiF content in the SEI film between LiFePO4 electrode surface and the electrolyte. That is why it improves the lithium ion transport and also cycle performance. According to our observations, the boron alkyl-based additive has the ability to improve the cycle fading of LiFePO4 at high temperature. Furthermore, the LiFePO4 electrode which cycled in the electrolyte without additive showed a significant increase in impendence by EIS analysis. Additionally, the SEM and FTIR reveal the evidences of surface morphology change and SEI formation, respectively.

中文摘要......................................................................................................
Ⅰ
英文摘要......................................................................................................
Ⅱ
目次..............................................................................................................
Ⅳ
表次..............................................................................................................
Ⅶ
圖次..............................................................................................................
Ⅷ
第一章 緒論
1-1 前言.........................................................................................................
1
1-2 鋰離子電池工作原理介紹.....................................................................
6
1-3 鋰離子電池的材料介紹.........................................................................
8
1-3-1 負極材料............................................................................................
8
1-3-2 正極材料............................................................................................
12
1-3-3 隔離膜................................................................................................
23
1-3-4 電解液................................................................................................
24
1-3-5 電解液添加劑....................................................................................
27
1-4 研究目的.................................................................................................
30
1-5 研究架構.................................................................................................
31
第二章 實驗儀器ヽ材料與步驟
2-1 實驗儀器名稱.........................................................................................
32
2-2 實驗材料與藥品.....................................................................................
33
2-3 實驗步驟.................................................................................................
34
2-3-1 磷酸鋰鐵極片製備............................................................................
34
2-3-2 電解液製備........................................................................................
34
2-3-3 電池組裝............................................................................................
34
2-4 電池電性測試.........................................................................................
35
2-4-1 可逆電容量測試................................................................................
35
2-4-2 循環壽命測試....................................................................................
36
2-4-3 交流阻抗測試....................................................................................
36
2-5 電化學分析.............................................................................................
40
2-5-1 循環伏安測試....................................................................................
40
2-6 材料分析儀器.........................................................................................
41
2-6-1 掃描式電子顯微鏡............................................................................
41
2-6-2 X-射線繞射光譜儀.............................................................................
42
2-6-3 傅立葉轉換紅外線光譜儀................................................................
43
第三章 結果與討論
3-1 循環伏安分析.........................................................................................
47
3-2 第一次充放電容量測試.........................................................................
51
3-3 循環壽命及放電速率測試.....................................................................
53
3-4 交流阻抗分析.........................................................................................
58
3-5 掃描式電子顯微鏡分析.........................................................................
67
3-6 傅立葉轉換紅外線光譜儀分析.............................................................
74
3-7 X-射線繞射光譜儀分析..........................................................................
80
第四章 結論
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