博碩士論文 104329010 詳細資訊




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姓名 劉翁境(WENG-JING LIU)  查詢紙本館藏   畢業系所 材料科學與工程研究所
論文名稱 高濃度電解質於鋰電池知應用研究
(High Concentration Electrolytes for Lithium Batteries)
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摘要(中) 本論文中利用高濃度醚類電解液、高濃度碳酸類電解液,分別應
用於石墨負極和鋰金屬負極,提高電容量、庫倫效率。
第一部分為高濃度醚類電解液應用於鋰金屬負極,同時比較一系
列鏈狀、環狀醚類,發現有別於傳統商用電解液低庫倫效率的問題,
高濃度醚類電解液有約 97%的庫倫效率,同時抑制鋰金屬枝晶狀結構
的產生。
第二部分為高濃度碳酸類電解液應用於鋰金屬負極,其庫倫效率
有約 96%,相較於文獻上傳統碳酸類電解液小於 90%的低庫倫效率,
有效提高約 15%以上的庫倫效率,其重點在不同於以往碳酸類溶劑溶
液容易生長出鋰金屬枝晶狀結構,高濃度碳酸類電解液呈現非常不同
的形貌。
第三部分為高濃度碳酸類電解液應用於石墨負極,在石墨負極上
有相較以往商用電解液較高的電容量,改善了特別是在高速充放電時
傳統電解液在石墨中具有較低的電容量的問題,而利用高濃度電解液
也展現在不添加 EC 的情況下,能有效在石墨負極中具有循環可逆的
電容值,而不破壞石墨的結構。
結果顯示高濃度電解液能有效提高鋰金屬負極、石墨負極的電化
II
學性能,並抑制負面的影響,顯示高濃度電解液為一有效並容易達到
的方法。
摘要(英) In this study, high concentration ether and carbonate electrolytes were
used in graphite and lithium metal anode to enhance the electrochemical
properties in terms of coulombic efficiency, capacity, and high-rate.
The first part of this study explores high concentration ether electrolyte
used for lithium metal anode. On comparing a series of different ether
based electrolytes with 1M and 3M concentration, 3M ether based
electrolyte was found to offer exceptional properties than traditional
electrolytes. 3M ether based electrolytes solved the major problems faced
for Li metal anode (coulombic efficiency and dendrite formation). A very
high coulombic efficiency of ~97 % can be achieved using 3M.
The second part of this study of high concentration carbonate electrolyte
(1M, 3M, and 5.5M) for lithium metal anode. The coulombic efficiency of
about ~96% was obtained for the 5.5M electrolyte which was found to be
quite high compared to the literature on the traditional carbonate electrolyte
(less than 80%). In addition, the dendrite formation is completely inhibited
to a larger extent by using high concentration (5.5 M) carbonate
electrolytes.
The final part of the study involves high concentration carbonate
electrolyte (5.5M) used for graphite anode. The 5.5M electrolytes found to
offer high charge/discharge properties than the commercial electrolyte. The
exceptional properties are obtained even without the addition of EC, which
is a prerequisite for traditional electrolytes. Higher reversible performance
is obtained for 5.5M carbonate without destroying the graphitic structure.
The results show that high concentration electrolytes can effectively
improve the electrochemical performance of lithium metal anode and
graphite anode by offering high coulombic efficiency and inhibiting the
dendrite formation (in Li metal anode). This study demonstrates the higher
performance can be obtained by optimizing the electrolyte concentration.
關鍵字(中) ★ 高濃度
★ 鋰電池
關鍵字(英) ★ High Concentration Electrolyte
論文目次 摘要 I
Abstract III
致謝 IV
目錄 V
圖目錄 VII
第一章 緒論 1
1-1前言 1
1-2研究動機 2
第二章 文獻回顧 5
2-1鋰離子二次電池之石墨負極 5
2-2鋰二次電池之鋰金屬負極 8
2-3鋰金屬電池的契機 11
2-5有機高濃度電解液-石墨負極 19
2-6有機高濃度電解液-鋰金屬負極 37
2-7有機高濃度電解液-固態電解液介面 52
2-8有機高濃度電解液-正極的防蝕 58
第三章 實驗方法與步驟 69
3-1實驗藥品與器材 69
3-2實驗步驟 71
3-3材料鑑定分析 75
3-4電化學性質測試 75
第四章 結果與討論 77
4-1高濃度醚類電解液 77
4-2高濃度碳酸類電解液 100
4-3常見碳酸類電解液應用於石墨負極 121
第五章 結論 129
參考文獻 131
參考文獻

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指導教授 張仍奎(Jeng-Kuei Chang) 審核日期 2017-8-15
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