高性能鋰離子電池的製備｜國立中央大學博碩士論文系統

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研究生：	黨苓之 Ling-Chih Tang
論文名稱：	高性能鋰離子電池的製備 Preparation of high-performance lithium-ion battery
指導教授：	諸柏仁 Po-Jen Chu
口試委員:
學位類別：	碩士 Master
系所名稱：	理學院 - 化學學系 Department of Chemistry
畢業學年度：	98
語文別：	中文
論文頁數：	99
中文關鍵詞：	安全添加劑、導電高分子、巴比妥酸
外文關鍵詞：	1，3-Dimethylbarbituric acid, EDOT, barbituric acid, conductive polymer
相關次數：	點閱：21 下載：0
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鋰電池之陰極經過處理產生特殊結構之固態電解質介面(solid electrolyte interface，SEI )，有助於充放電過程中鋰離子之傳遞，並提升電極之穩定性，同時亦有助於提高鋰電池的電性及安全性。
針對此本研究提出兩種改進固態電解質介面的方法達成製作高性能高安全性鋰電池之目標。本研究第一部份藉由添加導電高分子修飾 SEI，增進鋰離子電池的快充效能及電池壽命。由多種單體中篩選出thiophene單體衍生物3,4-Ethylenedioxythiophene (EDOT)並將之進行電化學聚合附著於陰極材料表面。導電高分子具有電子傳遞主鏈及離子傳遞側鏈，在陰極上構建了有效的磷酸鋰鐵電荷轉移。添加了EDOT可看出在C-Rate及壽命上皆有改進，高濃度可提高電容量，但並不是越高越好。隨著濃度的增加，所需活化穩定的圈數也越長，也越容易阻塞電極上離子的傳遞，本研究以0.03M pEDOT為最佳化條件。
第二部分為經由在電解質液中添加活性分子改善鋰離子電池的安全性。目前市售鋰離子電池廣泛採用的陰極材料鈷酸鋰，其整體安全性仍待突破。本研究將巴比妥酸(BTA)及其衍生物分別添加到以鈷酸鋰為陰極材料的電解質液中，藉由13DBTA與BTA的化學特性觀察其改變，由熱差式掃描分析儀(DSC)顯示放熱溫度延後，但在電池的測試中也發現有電容量的損失。因此藉由添加比例的調控，可控制電池性能與安全效果的提升。相較於一般電池使用耐燃劑，雖可穩定電池的安全性，卻大量犧牲了電池的電容量，本研究則兼顧循環壽命與熱穩定性的特性達到雙贏的效果。

The cathode of Li-ion battery after charge-discharged can produce a special structure named solid electrolyte interface (solid electrolyte interface, SEI), which helps lithium ion transmission during charge and discharge process, and improves the electrode stability. Charge capacity and safety can also be improved by improving SEI structure. The research presents two approaches to the improvement of SEI structure with the aim to produce high performance and safe lithium battery. This study is divided into two parts. The first part describes the modification of SEI through the addition of conducting polymer, which enhances both the C-rate capacity and cycle life. After screening several monomers, the thiophene monomer derivatives: 3,4-Ethylenedioxythiophene (EDOT) is found to be most effective for this purpose after electrochemical polymerization on the cathode surface. The conductive polymer is composed of electronic conducting main chain and ion conductive side-chain, enabling an efficient charge transfer on the interface of the LiFePO4 cathode particles. The addition, EDOT has effectively improved the C-Rate capability and life cycle. The improvement is found to increase with EDOT concentration but optimized at certain threshold. In presence of excess EDOT, longer activation cycle (during which polymerization is achieved) will be required to completely polymerize EDOT, and the interface may be too thick whcih blocks the litium insertion. In this system, 0.03M is the optimized concentration.
The second part of the study is to improve lithium battery safety feature with the addition of functional molecules in the electrolytes. LiCoO2 is the most widely used cathode material in commercial lithium ion batteries, but the safety remains an issue which urgently needing improvement. In this research, barbituric acid (BTA) and its derivatives as well as conducting polymer were added to the electrolyte to improve lithium battery safety. The delay of exothermic temperature can be observed by differential scanning thermal calorimetry (DSC). Carefully balancing the component composition, it is found the battery performance and safety features can both be enhanced. Conventional safety technology uses flame retardants to reduce electrolyte flammability, temperature control is not satisfactory, and the charge capacity usually suffers greatly. In contrast, present approach achieved the thermal stability while still maintaining the charge capacity and long cycle life.

摘 要	I
Abstract	II
誌 謝	IV
目錄	V
圖 目錄	VIII
表目錄	XIII
第一章	緒論	1
1-1  鋰電池之發展背景介紹	1
1-2 鋰離子電池之基本工作原理	3
1-3 鋰離子電池發展之瓶頸與缺點	4
1-4  研究動機與目的	7
第二章	文獻回顧	8
2-1 陰極材料的簡介	8
2-1-1 金屬氧化物：	8
2-1-2 非氧化物：	10
2-2 鋰電池性能的改質	11
2-2-1 導電高分子	11
2-2-2導電高分子修飾LiFePO4系統	13
2-3鋰電池熱穩定性	19
2-3-1  SEI的產生	20
2-3-2  陰極材料本身的放熱反應	22
2-4 安全性改質的技術及進展	25
2-4-1正增溫係數層(Positive-temperature-coefficient, PTC)	25
2-4-2 安全添加劑	27
2-4-3 常見的安全性研究測試方法	37
第三章	實驗方法	39
3-1  實驗儀器設備	39
3-2  實驗藥品器材	40
3-3  實驗步驟	41
3-3-1 製備EDOT電解質液	41
3-3-2製備13DBTA電解質液	41
3-3-3 製備混合比例13DBTA/BTA 電解質液	41
3-3-4製備BMI電解質液	42
3-4  材料鑑定分析	42
3-4-1 循環伏安法電聚合導電高分子	42
3-4-2 掃瞄式電子顯微鏡分析（SEM）	42
3-4-3 微分掃描熱卡分析儀 （DSC）	43
3-4-4變溫電子自旋共振（VT electron spin resonance, ESR）	43
3-4-5 核磁共振儀分析（NMR）	44
3-4-6 電解質液導電度測試	44
3-5  材料電化學特性分析	45
3-5-1電池性能測試	45
3-5-2 交流阻抗分析儀測試(AC Impedance)	46
3-5-3慢速循環伏安分析	48
第四章 結果與討論	49
4-1 導電高分子添加在磷酸鋰鐵系統中之鑑定分析與電性探討	49
4-1-1電化學分析-導電高分子之材料選擇	49
4-1-2 電解質液導電度測試	52
4-1-3 掃描式電子顯微鏡分析	53
4-1-4 電池性能分析	54
4-1-5 交流阻抗分析儀測試	59
4-1-6 循環伏安分析	62
4-2 巴比妥酸衍生物添加於鈷酸鋰系統中之鑑定分析與電性探討	64
4-2-1以變溫電子自旋共振（ESR）印證自由基的存在	66
4-2-2 自由基位置之鑑定	67
4-2-3  BTA在高溫時的keto-enol 互換	75
4-2-4  7Li-NMR	78
4-2-4 掃描式電子顯微鏡分析表面型態	80
4-2-5 以DSC分析熱穩定度的變化	82
4-2-6 電池性能測試	84
4-2-7 電池交流阻抗分析	90
第五章 結論與展望	93
5-1 導電高分子添加在磷酸鋰鐵系統	93
5-2 巴比妥酸衍生物添加於鈷酸鋰系統	94
參考文獻	95

                                

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