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鈉及釩元素之摻雜對磷酸鋰鐵/碳複合材料之電化學性能的影響研究 = The...

國立高雄大學應用化學系碩士班

鈉及釩元素之摻雜對磷酸鋰鐵/碳複合材料之電化學性能的影響研究 = The Study of Electrochemical Performances of LiFePO4/C Composites Doped with Na and V

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	The Study of Electrochemical Performances of LiFePO4/C Composites Doped with Na and V
作者:	陳雅文,
其他團體作者:	國立高雄大學
出版地:	[高雄市]
出版者:	撰者;
出版年:	2011[民100]
面頁冊數:	109面圖，表 : 30公分;
標題:	鋰離子電池
標題:	Lithium-ion batteries
電子資源:	http://handle.ncl.edu.tw/11296/ndltd/52989075425204282982
附註:	參考書目：面103-109
其他題名:	鈉及釩元素之摻雜對磷酸鋰鐵碳複合材料之電化學性能的影響研究
摘要註:	本實驗利用溶膠凝膠法合成 LiFePO4/C、Na-doped LiFePO4/C、V-doped LiFePO4/C 與 Na, V-doped LiFePO4/C 四種複合材料，Li：Na 與 Fe：V 之理論莫耳比皆為 0.97：0.03，透過 XRD、SEM、TEM 等儀器檢測之結果，顯示出微量摻雜對於磷酸鋰鐵之晶格結構不會造成明顯影響，摻雜了 Na 和 V 的一次粒子大小有縮小的趨勢，不過，在碳含量相近的情況之下，此四種複合材料於 0.1 C 時的放電電容分別依序約為 103.11、127.74、143.31 和 129.27 mAh/g，顯示出摻雜金屬元素於磷酸鋰鐵中有助於提升其電化學性能表現，其中以 V-doped LiFePO4/C 表現最佳，而 Na, V-doped LiFePO4/C 的電容量表現雖比 Na-doped LiFePO4/C 稍好，但卻不比 V-doped LiFePO4/C，根據 CV 和 A.C. impedance 的實驗結果，我們推測改善的主要原因在於摻雜金屬元素對 LiFePO4 的導電性和 Li 離子擴散性有增益的效果，除此之外，摻雜 Na 和 V 也提升了LiFePO4 結構穩定性，對 LiFePO4 在高充放電速率時的電容量表現之改善也有所助益。 The LiFePO4/C, Na-doped LiFePO4/C, V-doped LiFePO4/C, and Na, V-doped LiFePO4/C composites were synthesized by sol-gel method. The molar ratios about Li: Na and Fe: V are 0.97: 0.03. The effects of Na and V doping are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM)、transmission electron microscope (TEM), cyclic voltammetry (CV), and A.C. Impedance. The results indicate that doped Na and V do not make the lattice structure of LiFePO4 change obviously. The particle size is decreased by doping Na and V. Electrochemical test results show that V-doped LiFePO4/C exhibits the best electrochemical performance with discharge capacity of 143.31 mAh/g at 0.1 C. Second is 129.27 mAh/g of Na, V-doped LiFePO4/C. Third is 127.74 mAh/g of Na-doped LiFePO4/C, and 103.11 mAh/g of LiFePO4/C is the last. A.C. impedance results demonstrate that the charge transfer resistance of Na-doped LiFePO4/C, V-doped LiFePO4/C, and Na, V-doped LiFePO4/C decreases, and the Li ions diffusion of these samples also is improved. Furthermore, the lattice structure stability of LiFePO4 is also enhanced by doping Na and V. Based on above experimental results, the rate capability of LiFePO4 measured at high charge/discharge rate is improved.

鈉及釩元素之摻雜對磷酸鋰鐵/碳複合材料之電化學性能的影響研究 = The Study of Electrochemical Performances of LiFePO4/C Composites Doped with Na and V
陳, 雅文

鈉及釩元素之摻雜對磷酸鋰鐵/碳複合材料之電化學性能的影響研究 = The Study of Electrochemical Performances of LiFePO4/C Composites Doped with Na and V / 陳雅文撰 - [高雄市] : 撰者, 2011[民100]. - 109面 ; 圖，表 ; 30公分.
參考書目：面103-109.
鋰離子電池Lithium-ion batteries

鈉及釩元素之摻雜對磷酸鋰鐵/碳複合材料之電化學性能的影響研究 = The Study of Electrochemical Performances of LiFePO4/C Composites Doped with Na and V
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330 $a 本實驗利用溶膠凝膠法合成 LiFePO4/C、Na-doped LiFePO4/C、V-doped LiFePO4/C 與 Na, V-doped LiFePO4/C 四種複合材料，Li：Na 與 Fe：V 之理論莫耳比皆為 0.97：0.03，透過 XRD、SEM、TEM 等儀器檢測之結果，顯示出微量摻雜對於磷酸鋰鐵之晶格結構不會造成明顯影響，摻雜了 Na 和 V 的一次粒子大小有縮小的趨勢，不過，在碳含量相近的情況之下，此四種複合材料於 0.1 C 時的放電電容分別依序約為 103.11、127.74、143.31 和 129.27 mAh/g，顯示出摻雜金屬元素於磷酸鋰鐵中有助於提升其電化學性能表現，其中以 V-doped LiFePO4/C 表現最佳，而 Na, V-doped LiFePO4/C 的電容量表現雖比 Na-doped LiFePO4/C 稍好，但卻不比 V-doped LiFePO4/C，根據 CV 和 A.C. impedance 的實驗結果，我們推測改善的主要原因在於摻雜金屬元素對 LiFePO4 的導電性和 Li 離子擴散性有增益的效果，除此之外，摻雜 Na 和 V 也提升了LiFePO4 結構穩定性，對 LiFePO4 在高充放電速率時的電容量表現之改善也有所助益。 The LiFePO4/C, Na-doped LiFePO4/C, V-doped LiFePO4/C, and Na, V-doped LiFePO4/C composites were synthesized by sol-gel method. The molar ratios about Li: Na and Fe: V are 0.97: 0.03. The effects of Na and V doping are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM)、transmission electron microscope (TEM), cyclic voltammetry (CV), and A.C. Impedance. The results indicate that doped Na and V do not make the lattice structure of LiFePO4 change obviously. The particle size is decreased by doping Na and V. Electrochemical test results show that V-doped LiFePO4/C exhibits the best electrochemical performance with discharge capacity of 143.31 mAh/g at 0.1 C. Second is 129.27 mAh/g of Na, V-doped LiFePO4/C. Third is 127.74 mAh/g of Na-doped LiFePO4/C, and 103.11 mAh/g of LiFePO4/C is the last. A.C. impedance results demonstrate that the charge transfer resistance of Na-doped LiFePO4/C, V-doped LiFePO4/C, and Na, V-doped LiFePO4/C decreases, and the Li ions diffusion of these samples also is improved. Furthermore, the lattice structure stability of LiFePO4 is also enhanced by doping Na and V. Based on above experimental results, the rate capability of LiFePO4 measured at high charge/discharge rate is improved.
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