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利用噴霧乾燥法合成磷酸鋰鐵/碳複合材料並探討其電化學性能 = Synth...

吳雋凡

利用噴霧乾燥法合成磷酸鋰鐵/碳複合材料並探討其電化學性能 = Synthesis and Electrochemical Characterization ofLiFePO4/C Composite Prepared by Spray-dry Route

Record Type:	Language materials, printed : monographic
Paralel Title:	Synthesis and Electrochemical Characterization ofLiFePO4/C Composite Prepared by Spray-dry Route
Author:	吳雋凡,
Secondary Intellectual Responsibility:	國立高雄大學
Place of Publication:	[高雄市]
Published:	撰者;
Year of Publication:	民100[2011]
Description:	116面圖，表 : 30公分;
Subject:	鋰離子二次電池
Subject:	lithium-ion batteries
Online resource:	http://handle.ncl.edu.tw/11296/ndltd/73015295791631761548
[NT 15001349]:	利用噴霧乾燥法合成磷酸鋰鐵碳複合材料並探討其電化學性能
Summary:	近年來電動交通工具的開發與應用成為熱門課題，而磷酸鋰鐵具有製備成本低、結構熱穩定性佳、安全性佳、無毒性、高能量密度、高輸出功率等優點，未來可望運用於電動車輛的動力來源，具有很高的發展潛力。目前的研究指出磷酸鋰鐵在應用上有兩大缺點，為導電度差(~10-9 S/cm) 和鋰離子擴散限制。本研究利用噴霧乾燥法製備磷酸鋰鐵/碳複合材料，來改善磷酸鋰鐵的上述缺點。利用熱重/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。本研究結果顯示添加界面活性劑BK-50 之條件所製備的磷酸鋰鐵/碳複合材料，藉由界面活性劑結構上的特點，在特定的濃度比例下會自組裝形成微胞，經高溫裂解後均勻被覆碳層在材料表面，且產生些許孔洞，增加其反應面積，並以噴霧乾燥法控制其材料粒子大小均一，進而提高電化學性能。由實驗結果得知添加BK-50 樣品於 700 °C 煅燒後有最佳之電化學表現。該電池於0.1 C-rate放電速率下電容量可達 145 mAh/g，相當於理論電容量的 85 %，1 C-rate 高放電速率下電容量可達 118 mAh/g；且 0.1 C-rate 放電速率下經 10 圈循環壽命測試，具有良好的循環穩定性。 LiFePO4 having a theoretical capacity of 170 mAh/g is environmentally benign,inexpensive, thermal stability, and good cycle stability. These properties expected to be used in electric vehicles. However, it was reported that this cathode has very low electronic conductivity (~10-9 S/cm) and Li-ion diffusion-limited. The LiFePO4/C composite powders have been synthesized by the spray-dry route in this work. All samples were characterized by thermogravimetric analysis/differential thermal analysis (TGA/DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), element analysis (EA), BET (Brunauer, Emmett and Teller) surfact area, dynamic light scattering (DLS) analysis, cyclic voltammetry (CV), AC impedance (AC), charge-discharge tests and cycle life test.In this research, the sample was directly synthesized via surfactant self-assembly and spray dry route. The special surfactant structure could make the microstructures including surface area, and spray dry route controlled the particle morphology; which resulted in fine particle size and uniform carbon distribution on the composite surface; the carbon layer was pyrolysised by surfactant, and LiFePO4 was crystallization after calcined at 700 °C; it was obtained the best electrochemical performance. The sample has the highest discharge capacity of 145 mAh/g (about 85 % of the theoretical capacity) at 0.1 C-rate and displayed a stable performance during cycling.

利用噴霧乾燥法合成磷酸鋰鐵/碳複合材料並探討其電化學性能 = Synthesis and Electrochemical Characterization ofLiFePO4/C Composite Prepared by Spray-dry Route
吳, 雋凡

利用噴霧乾燥法合成磷酸鋰鐵/碳複合材料並探討其電化學性能 = Synthesis and Electrochemical Characterization ofLiFePO4/C Composite Prepared by Spray-dry Route / 吳雋凡撰 - [高雄市] : 撰者, 民100[2011]. - 116面 ; 圖，表 ; 30公分.
參考書目：面104-116.
鋰離子二次電池lithium-ion batteries

利用噴霧乾燥法合成磷酸鋰鐵/碳複合材料並探討其電化學性能 = Synthesis and Electrochemical Characterization ofLiFePO4/C Composite Prepared by Spray-dry Route
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