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利用微乳化法製備磷酸鋰鐵/碳複合材料並探討溫度對其性能的影響研究 = E...

國立高雄大學電機工程學系--工業技術整合產業研發碩士專班

利用微乳化法製備磷酸鋰鐵/碳複合材料並探討溫度對其性能的影響研究 = Effect of Synthesis Temperature on the Properties of LiFePO4/C Composites Prepared by the Microemulsion Method

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	Effect of Synthesis Temperature on the Properties of LiFePO4/C Composites Prepared by the Microemulsion Method
作者:	鐘亞晴,
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:	民99[2010]
面頁冊數:	95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/29031264667907277926
摘要註:	磷酸鋰鐵 (LiFePO4) 因為具備高理論電容、循環壽命長、低成本、低毒性及熱穩定性佳等優點，被視為相當有發展潛力的鋰電池陰極材料；卻又受限於其材料導電度低 (10-9 S/cm, 25 ℃) 與鋰離子擴散速率限制 (1.8 × 10-14 cm2/s)。為改善材料之電化學性能，本研究嘗試以不同煅燒溫度製備 LiFePO4，並探討煅燒溫度對於材料之物理性、化學性及電化學性能之影響。　　本研究以逆微胞方式之微乳化系統製備奈米磷酸鋰鐵/碳 (LiFePO4/C) 複合材料。選擇非離子型界面活性劑作為碳源，與水相、正丁醇、環己烷以特定比例配製成微乳化液，藉由改變不同的煅燒溫度條件，控制生成的粒子尺寸。　　將經過煅燒後所得的粉末分別以物理性能及電化學性能測試進行分析，包括熱重/熱差式分析 (TGA/DTA)、 X-ray 繞射分析 (XRD)、穿透式電子顯微鏡 (TEM)、掃描式電子顯微鏡 (SEM)、元素分析 (EA)、比表面積分析 (BET method)、動態光散射粒徑分析 (DLS)、交流阻抗法分析 (AC impedance)、循環伏安法 (CV) 及充放電測試進行分析。　　研究結果顯示以煅燒 600 ℃ 溫度條件所製備的磷酸鋰鐵/碳複合材料，具有最小的粒子尺寸、電荷轉移阻抗、鋰離子擴散阻抗，且在電化學性能上表現良好。電池於 0.1 C 放電速率下電容量可達 143 mAh/g，相當於理論電容量的 84 %，10 C 高放電速率下電容量可達 58 mAh/g；且 0.1 C 放電速率下經 30 圈循環壽命測試，結果具有良好的循環穩定性。 LiFePO4 is promising for cathode material of lithium-ion batteries due to its high specific capacity, long cycle life, low cost, low toxicity and thermal stability. However, LiFePO4 has poor electronic conductivity (10-9 S/cm) and slow lithium-ion diffusion kinetics (1.8 × 10-14 cm2/s) at room temperature. In an attempt to raise electrochemical properties, raw materials with various sintering temperatures were investigated in this study. Electroactive LiFePO4/C composite powders have been successfully prepared by the microemulsion method under specific conditions. Nonionic surfactants were used as carbon additives in LiFePO4/C composite. The aqueous cores of water, surfactant, n-butanal and cyclohexane were used as microreactors for precursor of microemulsions. This paper reveals particle size is dominately controlled by sintering temperatures. Nano-crystalline LiFePO4/C composite powders were obtained by calcinating the cores at 600 ℃, 700 ℃ and 800 ℃. All samples were characterized by thermogravimetric analysis/differential thermal analysis, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, element analysis, BET, particle size analysis, cyclic voltammetry, AC impedance and charge-discharge tests. The smaller particles were obtained at lower sintering temperature. The performance of the LiFePO4/C composite powders is correspondent to particle size. The sample prepared at 600 ℃ has the highest discharge capacity of 143 mAh/g (about 84 % of the theoretical capacity) at 0.1 C rate and displayed a stable performance during cycling.

利用微乳化法製備磷酸鋰鐵/碳複合材料並探討溫度對其性能的影響研究 = Effect of Synthesis Temperature on the Properties of LiFePO4/C Composites Prepared by the Microemulsion Method
鐘, 亞晴

利用微乳化法製備磷酸鋰鐵/碳複合材料並探討溫度對其性能的影響研究 = Effect of Synthesis Temperature on the Properties of LiFePO4/C Composites Prepared by the Microemulsion Method / 鐘亞晴撰 - [高雄市] : 撰者, 民99[2010]. - 95面 ; 圖，表 ; 30公分.
參考書目：面.
鋰離子電池Lithium-ion batteries

利用微乳化法製備磷酸鋰鐵/碳複合材料並探討溫度對其性能的影響研究 = Effect of Synthesis Temperature on the Properties of LiFePO4/C Composites Prepared by the Microemulsion Method
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330 $a 　　磷酸鋰鐵 (LiFePO4) 因為具備高理論電容、循環壽命長、低成本、低毒性及熱穩定性佳等優點，被視為相當有發展潛力的鋰電池陰極材料；卻又受限於其材料導電度低 (10-9 S/cm, 25 ℃) 與鋰離子擴散速率限制 (1.8 × 10-14 cm2/s)。為改善材料之電化學性能，本研究嘗試以不同煅燒溫度製備 LiFePO4，並探討煅燒溫度對於材料之物理性、化學性及電化學性能之影響。　　本研究以逆微胞方式之微乳化系統製備奈米磷酸鋰鐵/碳 (LiFePO4/C) 複合材料。選擇非離子型界面活性劑作為碳源，與水相、正丁醇、環己烷以特定比例配製成微乳化液，藉由改變不同的煅燒溫度條件，控制生成的粒子尺寸。　　將經過煅燒後所得的粉末分別以物理性能及電化學性能測試進行分析，包括熱重/熱差式分析 (TGA/DTA)、 X-ray 繞射分析 (XRD)、穿透式電子顯微鏡 (TEM)、掃描式電子顯微鏡 (SEM)、元素分析 (EA)、比表面積分析 (BET method)、動態光散射粒徑分析 (DLS)、交流阻抗法分析 (AC impedance)、循環伏安法 (CV) 及充放電測試進行分析。　　研究結果顯示以煅燒 600 ℃ 溫度條件所製備的磷酸鋰鐵/碳複合材料，具有最小的粒子尺寸、電荷轉移阻抗、鋰離子擴散阻抗，且在電化學性能上表現良好。電池於 0.1 C 放電速率下電容量可達 143 mAh/g，相當於理論電容量的 84 %，10 C 高放電速率下電容量可達 58 mAh/g；且 0.1 C 放電速率下經 30 圈循環壽命測試，結果具有良好的循環穩定性。 LiFePO4 is promising for cathode material of lithium-ion batteries due to its high specific capacity, long cycle life, low cost, low toxicity and thermal stability. However, LiFePO4 has poor electronic conductivity (10-9 S/cm) and slow lithium-ion diffusion kinetics (1.8 × 10-14 cm2/s) at room temperature. In an attempt to raise electrochemical properties, raw materials with various sintering temperatures were investigated in this study. Electroactive LiFePO4/C composite powders have been successfully prepared by the microemulsion method under specific conditions. Nonionic surfactants were used as carbon additives in LiFePO4/C composite. The aqueous cores of water, surfactant, n-butanal and cyclohexane were used as microreactors for precursor of microemulsions. This paper reveals particle size is dominately controlled by sintering temperatures. Nano-crystalline LiFePO4/C composite powders were obtained by calcinating the cores at 600 ℃, 700 ℃ and 800 ℃. All samples were characterized by thermogravimetric analysis/differential thermal analysis, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, element analysis, BET, particle size analysis, cyclic voltammetry, AC impedance and charge-discharge tests. The smaller particles were obtained at lower sintering temperature. The performance of the LiFePO4/C composite powders is correspondent to particle size. The sample prepared at 600 ℃ has the highest discharge capacity of 143 mAh/g (about 84 % of the theoretical capacity) at 0.1 C rate and displayed a stable performance during cycling.
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610 1 $a Lithium-ion batteries $a LiFePO4 $a cathode materials $a microemulsion method
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