於丁二腈電解質添加碳酸乙烯酯對鋰離子電池性能之影響

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姓名

陳柏宇(Bo-Yu Chen) 查詢紙本館藏

畢業系所

材料科學與工程研究所

論文名稱

於丁二腈電解質添加碳酸乙烯酯對鋰離子電池性能之影響
(The effects of addition of ethylene carbonate in succinonitrile-based electrolyte on the performance of Li-ion batteries)

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摘要(中)

本研究將不同體積百分比(10, 20, 30 %(v/v) )之碳酸乙烯酯添加至含有六氟磷酸鋰之丁二腈溶液以配置成0.3 M六氟磷酸鋰溶液，並從化學穩定性、電化學阻抗圖譜、充放電及界面穩定性測試去分析添加碳酸乙烯酯對丁二腈電解質之影響。從化學穩定性可得知添加碳酸乙烯酯有助於抑制丁二腈與鋰金屬反應。從電化學阻抗圖譜可得知當添加30 %(v/v)之碳酸乙烯酯，其電解質於室溫下具有2.3810-3 S cm-1之離子傳導率。從充放電測試可得知磷酸鋰鐵/添加30 %(v/v)碳酸乙烯酯之電解質/鋰金屬半電池於0.1 C具有約143 mAh g-1之放電電容值，此電容值為理論電容值(170 mAh g-1)之84 %。於界面穩定性測試，當以0.1 mA/cm2電流密度進行充放電時，添加30 %(v/v)碳酸乙烯酯之電解質其電池能於穩定之電壓範圍進行充放電，因此推論於此添加量，碳酸乙烯酯能與鋰金屬反應生成較穩定之固態電解質界面。

摘要(英)

In this research, different volume percentage (10, 20, 30 %(v/v) ) of ethylene carbonate is added into succinonitrile mixed with lithium hexafluorophosphate to form 0.3 M lithium hexafluorophosphate solution. By using chemical stability test, electrochemical impedance spectroscopy, charge and discharge test, and interface stability test, we can analyze the effect of the addition of ethylene carbonate in succinonitrile-based electrolyte on the Li-ion batteries. The chemical stability tests show that the addition of ethylene carbonate can inhibit the interfacial reaction of lithium metal and succinonitrile. Based on the results of electrochemical impedance spectroscopy, the electrolyte possesses the ion conductivity of 2.3810-3 S cm-1 at room temperature when 30 %(v/v) amount of ethylene carbonate is added. The charge and discharge tests also indicate that lithium iron phosphate/30 %(v/v) ethylene carbonate in succinonitrile-based electrolyte/lithium metal half cell shows the discharge capacity of 143 mAh g-1, which is 84 % of the theoretical capacity (170 mAh g-1). Interface stability test indicates that when 30 %(v/v) amount of ethylene carbonate is added, the battery can charge and discharge at the stable voltage range, it can be concluded that the stable solid electrolyte interface forms between electrolyte and lithium metal.

關鍵字(中)

★ 丁二腈
★ 電解質
★ 碳酸乙烯酯
★ 鋰離子電池

關鍵字(英)

★ succinonitrile
★ electrolyte
★ ethylene carbonate
★ Li-ion batteries

論文目次

摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 vii
第一章緒論 1
1.1 前言 1
1.2 電池發展與介紹 1
1.2.1 一次電池 1
1.2.2 二次電池 2
1.3 鋰離子二次電池 2
1.3.1 鋰離子二次電池之工作原理 3
1.4 電解質 4
1.4.1 液態電解質 6
1.5 丁二腈 8
1.6 研究動機與目的 9
第二章實驗步驟與儀器原理 10
2.1 實驗藥品 10
2.2 實驗步驟 11
2.2.1 碳酸乙烯酯/六氟磷酸鋰/丁二腈之溶液配置 11
2.2.2 磷酸鋰鐵正極片之製備 11
2.2.3 CR2032鈕扣電池之封裝 14
2.3 實驗儀器 15
2.3.1 電化學阻抗圖譜 (Electrochemical Impedance Spectroscopy) 15
2.3.2 線性掃描伏安法 16
2.3.3 充放電測試 (Charge and discharge test) 16
2.3.4 界面穩定性測試 (Interface stability test) 17
第三章結果與討論 18
3.1 化學穩定性測試 18
3.2 添加碳酸乙烯酯對室溫下溶液之狀態影響 19
3.3 交流阻抗分析 19
3.4 工作電位窗分析 21
3.5 界面穩定性測試 22
3.6 充放電測試 23
第四章結論 26
參考文獻 27

參考文獻

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指導教授

李勝偉(Sheng-Wei Lee)

審核日期

2021-8-10

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