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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 呂宗昕 | |
dc.contributor.author | Hong-Ting Qiu | en |
dc.contributor.author | 邱弘廷 | zh_TW |
dc.date.accessioned | 2021-06-08T02:45:48Z | - |
dc.date.copyright | 2018-03-01 | |
dc.date.issued | 2017 | |
dc.date.submitted | 2017-11-02 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/20345 | - |
dc.description.abstract | 本文使用溶膠凝膠法並以洋菜粉作為螯合劑和碳源,成功地合成橄欖石結構的LiMn0.5Fe0.5PO4正極材料。當前驅物不含洋菜其經過高溫煅燒後無法合成LiMn0.5Fe0.5PO4單相,產物含有Li3Fe2(PO4)3相。推測其原因為三價鐵無法有效地被還原為二價鐵。當前驅物加入洋菜後,經400oC、8h煅燒即可合成LiMn0.5Fe0.5PO4單相。前驅物熱分析顯示在360oC時洋菜粉裂解形成的碳源,經由碳熱還原反應將三價鐵還原為二價鐵。以洋菜粉為碳源,發現當煅燒溫度提高時,其晶粒大小與粒徑亦隨之增加。當溫度由400oC提升至700oC時其晶粒大小由20nm增加到42nm,且粒徑則由1um增加到3um。經700oC、8h煅燒後之LiMn0.5Fe0.5PO4具有高結晶性。再經Rieveld分析確定其材料具有橄欖石結構,屬於正交晶系且為Pbnm空間群。顯示在合適的煅燒溫度和時間下,藉由添加洋菜粉可製備良好的LiMn0.5Fe0.5PO4粉體。 | zh_TW |
dc.description.abstract | LiMn0.5Fe0.5PO4 cathode materials with olivine structure were successfully synthesized via the sol-gel method. The agar powder was used as the chelating agent for synthesizing the cathode materials as well as the carbon sources. The pure-phased LiMn0.5Fe0.5PO4 could not be synthesized even after the calcination of the precursors at high temperatures. The product contained an impurity of Li3Fe2 (PO4)3 phase, owing to the inefficacy of the reduction of Fe3+ to Fe2+. When the agar was added to the precursors, LiMn0.5Fe0.5PO4 pure phase was synthesized at 400oC for 8h. The thermal analysis of the precursors showed that the carbon sources formed after the pyrolysis of the agar, and reduced Fe3+ to Fe2+ via carbothermal reduction at 360oC. It was observed that when the calcination temperature was increased, the grain sizes and particle sizes were also increased. When the temperature was raised from 400oC to 700oC, the grain sizes increased from 20 nm to 42 nm, and the particle size increased from 1 um to 3 um.The high crystalline characteristics were observed for the synthesized LiMn0.5Fe0.5PO4 materials, after the precursors were calcined at 700oC for 8h. The Rieveld analysis revealed the structure of the obtained materials as an orthorhombic structure having the space group as Pbnm. This research indicated that at appropriate calcination conditions, pure LiMn0.5Fe0.5PO4 powder synthesis was facilitated via the addition of agar. | en |
dc.description.provenance | Made available in DSpace on 2021-06-08T02:45:48Z (GMT). No. of bitstreams: 1 ntu-106-R04524071-1.pdf: 4328294 bytes, checksum: 30f4527baedc41b8ef2ab80cc7530d00 (MD5) Previous issue date: 2017 | en |
dc.description.tableofcontents | 目錄
摘要 7 Abstract 8 第一章 緒論 9 1.1 前言 9 1.2鋰電池的發展 10 1.3鋰電池原理介紹 10 1.4 正極材料 11 1.4.1鋰鈷氧化物(LiCoO2) 12 1.4.2 鋰鎳氧化物(LiNiO2) 12 1.4.3 尖晶石結構鋰錳氧化物(LiMn2O4) 13 1.4.4 橄欖石結構之正極材料LiFePO4 13 1.5 LiFePO4正極材料的製備方法 14 1.5.1 固相法 14 1.5.2 溶膠凝膠法 15 1.5.3共沉澱法 16 1.5.4 水熱法 17 1.5.5 微波水熱法 19 1.6 LiFexMn1-xPO4磷酸鋰鐵錳正極材料 19 1.7 LiFePO4正極材料中鋰離子的擴散 20 1.8 LiFePO4正極材料的改性 22 1.8.1 LiFePO4的碳包覆 22 1.8.2 LiFePO4的金屬離子摻雜 23 1.8.3 LiFePO4的粒徑控制 23 1.9 研究目的 24 第二章 實驗方法 38 2.1 X光繞射圖譜分析(X-ray Diffraction analysis) 38 2.1.1布拉格定律 38 2.1.2 米勒指數 38 2.1.3 X光粉末繞射分析 39 2.2 雷射光繞射粒徑分析儀(LS-230) 41 2.2.1光繞射法 41 2.2.2靜態雷射光散射法(Static Light Scattering) 42 2.2.3 LS230之其它相關理論 42 2.2.4 LS-230儀器性能 42 2.2.5 LS230各式模組 42 2.3 掃描式電子顯微鏡SEM(Scanning Electron Microscopy) 43 2.3.1 SEM原理 43 2.3.2 二次電子 43 2.3.3 背向散射電子 44 2.3.4 SEM儀器裝置 44 2.4 差示熱分析法(DTA)與熱重量分析(TGA) 46 2.4.1 DTA原理 46 2.4.2 TGA原理 47 2.5實驗步驟 48 2.5.1 LiMn0.5Fe0.5PO4的製備 48 2.5.2 LiMn0.5Fe0.5PO4正極材料之特性分析 48 第三章 使用洋菜粉當碳源以溶膠凝膠法合成Li(Mn0.5Fe0.5)PO4正極材料之特性分析 56 3.1 煅燒溫度對Li(Mn0.5Fe0.5)PO4晶格與粉體形貌的影響分析 56 3.2 Li(Mn0.5Fe0.5)PO4前驅物的熱重-差熱分析與煅燒時間的影響 58 第四章 結論 69 參考文獻 71 | |
dc.language.iso | zh-TW | |
dc.title | "溶膠凝膠法製備Li(Mn,Fe)PO4正極材料與特性分析" | zh_TW |
dc.title | Sol-gel Preparation and Characterization of Li(Mn,Fe)PO4 Cathode Materials | en |
dc.type | Thesis | |
dc.date.schoolyear | 106-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 黃文正,溫政彥 | |
dc.subject.keyword | LiMn0.5Fe0.5PO4,洋菜粉,碳熱還原,溶膠-凝膠法, | zh_TW |
dc.subject.keyword | LiMn0.5Fe0.5PO4,Agar,Carbothermal reduction,Sol-gel method, | en |
dc.relation.page | 74 | |
dc.identifier.doi | 10.6342/NTU201704335 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2017-11-02 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 化學工程學研究所 | zh_TW |
顯示於系所單位: | 化學工程學系 |
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