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利用電紡絲法製備鋰離子電池之磷酸鋰鐵/碳複合奈米纖維正極材料 = Pre...

國立高雄大學應用化學系碩士班

利用電紡絲法製備鋰離子電池之磷酸鋰鐵/碳複合奈米纖維正極材料 = Preparation of LiFePO4/C Nanofibers by the Electrospinning Method for Positive Material of Lithium-ion Battery

Record Type:	Language materials, printed : monographic
Paralel Title:	Preparation of LiFePO4/C Nanofibers by the Electrospinning Method for Positive Material of Lithium-ion Battery
Author:	林慧宇,
Secondary Intellectual Responsibility:	國立高雄大學
Place of Publication:	[高雄市]
Published:	撰者;
Year of Publication:	民102[2013]
Description:	80面圖，表格 : 30公分;
Subject:	磷酸鋰鐵
Subject:	LiFePO4
Online resource:	http://handle.ncl.edu.tw/11296/ndltd/75867975222588710839
Notes:	105年3月31日公開
Notes:	參考書目：面74-80
Summary:	本實驗利用電紡絲法製備奈米纖維磷酸鋰鐵/碳複合材料，以高分子作為碳源及電紡中間體，前驅纖維經高溫鍛燒後LiFePO4重排成單晶相，高分子則碳化且均勻包覆材料，預先將前驅鹽類及高分子配製成高黏度的膠體溶液，控制腔體內環境以及工作電壓、距離，在穩定環境內紡織成前驅纖維，並探討不同高分子為碳源、LiFePO4添加量對材料的物性、後續電性的影響。結果發現不同磷酸鋰鐵的添加量會影響後續材料的構型、碳含量、以及其電性表現，過多的碳源添加會在高溫鍛燒過程中先行碳化並抑制內部包覆的磷酸鋰鐵晶體的重排，由SEM發現經電紡絲製備之材料尺寸均勻且為奈米尺寸，由TEM觀察出材料具單晶結構且碳層披覆均勻所以擁有較佳的物性以及電性表現。以PAN為碳源並額外添加12.5%的LiFePO4前驅鹽類經氧氣300oC預鍛燒持溫5小時，再以還原氣體800oC高溫鍛燒持溫12小時可獲得最佳條件之LiFePO4/C，具高比表面積111.9 m2/g，162mAh/g之電容量，且能穩定充放電30個循環，並能於30個循環後維持94%的電容量。 LiFePO4/C composite nanofibers were synthesized by electrospinning methods. Polymers were used as both the electrospinning media and as the carbon source. Precursor fibers converted to single-crystalline LiFePO4, and polymer decomposed to residual carbon evenly coating on particle surface. LiFePO4 precursors and polymer were separately dissolved in N,N-dimethylformamide (DMF) before electrospinning. Spinning conditions such as working distance, voltage. polymer selection, and precursor concentrations were varied by physical and electrochemical performance of LiFePO4/C. In this research, different LiFePO4 precursor concentration will influence LiFePO4/C morphology, carbon content, and electroperformance. Excess carbon content will carbonize and inhibit the rearrangement of internal LiFePO4 during calcination process. The characterization data reveal that LiFePO4/C nanostructures with uniformly dispersed carbon on the surface were produced, supplying good physical and electronic characteristics. The best condition of LiFePO4/C that using PAN as carbon source and 12.5% additional LiFePO4 precursor salts than precalcinated at 300oC for 5hr under air atmosphere, and calcinated again at 800oC for 12hr under reduction gas condition with highest surface area 111.9 m2/g, capacity of 162mAh/g at 0.1C. It still has 94% of initial capacity and stable performance after 30 cycle numbers.

利用電紡絲法製備鋰離子電池之磷酸鋰鐵/碳複合奈米纖維正極材料 = Preparation of LiFePO4/C Nanofibers by the Electrospinning Method for Positive Material of Lithium-ion Battery
林, 慧宇

利用電紡絲法製備鋰離子電池之磷酸鋰鐵/碳複合奈米纖維正極材料 = Preparation of LiFePO4/C Nanofibers by the Electrospinning Method for Positive Material of Lithium-ion Battery / 林慧宇撰 - [高雄市] : 撰者, 民102[2013]. - 80面 ; 圖，表格 ; 30公分.
105年3月31日公開參考書目：面74-80.
磷酸鋰鐵LiFePO4

利用電紡絲法製備鋰離子電池之磷酸鋰鐵/碳複合奈米纖維正極材料 = Preparation of LiFePO4/C Nanofibers by the Electrospinning Method for Positive Material of Lithium-ion Battery
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328 $a 碩士論文--國立高雄大學應用化學系碩士班
330 $a 本實驗利用電紡絲法製備奈米纖維磷酸鋰鐵/碳複合材料，以高分子作為碳源及電紡中間體，前驅纖維經高溫鍛燒後LiFePO4重排成單晶相，高分子則碳化且均勻包覆材料，預先將前驅鹽類及高分子配製成高黏度的膠體溶液，控制腔體內環境以及工作電壓、距離，在穩定環境內紡織成前驅纖維，並探討不同高分子為碳源、LiFePO4添加量對材料的物性、後續電性的影響。結果發現不同磷酸鋰鐵的添加量會影響後續材料的構型、碳含量、以及其電性表現，過多的碳源添加會在高溫鍛燒過程中先行碳化並抑制內部包覆的磷酸鋰鐵晶體的重排，由SEM發現經電紡絲製備之材料尺寸均勻且為奈米尺寸，由TEM觀察出材料具單晶結構且碳層披覆均勻所以擁有較佳的物性以及電性表現。以PAN為碳源並額外添加12.5%的LiFePO4前驅鹽類經氧氣300oC預鍛燒持溫5小時，再以還原氣體800oC高溫鍛燒持溫12小時可獲得最佳條件之LiFePO4/C，具高比表面積111.9 m2/g，162mAh/g之電容量，且能穩定充放電30個循環，並能於30個循環後維持94%的電容量。 LiFePO4/C composite nanofibers were synthesized by electrospinning methods. Polymers were used as both the electrospinning media and as the carbon source. Precursor fibers converted to single-crystalline LiFePO4, and polymer decomposed to residual carbon evenly coating on particle surface. LiFePO4 precursors and polymer were separately dissolved in N,N-dimethylformamide (DMF) before electrospinning. Spinning conditions such as working distance, voltage. polymer selection, and precursor concentrations were varied by physical and electrochemical performance of LiFePO4/C. In this research, different LiFePO4 precursor concentration will influence LiFePO4/C morphology, carbon content, and electroperformance. Excess carbon content will carbonize and inhibit the rearrangement of internal LiFePO4 during calcination process. The characterization data reveal that LiFePO4/C nanostructures with uniformly dispersed carbon on the surface were produced, supplying good physical and electronic characteristics. The best condition of LiFePO4/C that using PAN as carbon source and 12.5% additional LiFePO4 precursor salts than precalcinated at 300oC for 5hr under air atmosphere, and calcinated again at 800oC for 12hr under reduction gas condition with highest surface area 111.9 m2/g, capacity of 162mAh/g at 0.1C. It still has 94% of initial capacity and stable performance after 30 cycle numbers.
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