利用靜電紡絲法製備碳矽複合纖維並應用於鋰離子二次電池之負極材料

在許多高電容量之鋰離子電池之新興負極材料中，矽擁有最高的理論電容量–3579 mAh/g，因而受到全世界研究學者之注目。本研究利用只包含矽和氫元素的矽烷類，取代矽或SiOx做為矽前驅物，並加入PAN高分子電紡液中，利用靜電紡絲技術製備成一維的奈米線性結構。經過穩定化之熱處理後，在此使用一個簡單的方法進行碳化及還原：利用H2做為還原氣體進行矽化合物的還原；氬氣作為載氣進行碳化熱處理製備成碳矽複合纖維，並應用在鋰離子二次電池之負極材料。在電極製備過程中，不需要任何的黏著劑或導電碳黑，甚至是銅箔的使用，目標以製程量化及減少成本。在經過二十圈之充放電循環後，其電化學表現展現高電容量（~954 mAh/g在0.1 C時）和高庫倫效率（96.34 %），顯示此種材料結構做為鋰離子二次電池之負極是具有可行性的。

關鍵字

靜電紡絲；碳矽複合纖維；氫氣還原；鋰離子電池；負極材料

並列摘要

Among many novel anode materials for Li-ion batteries, silicon exhibits the highest theoretical capacity of 3579 mAh/g, which attracted the attention of researchers worldwide. In this study, we prepared elecrospun silicon/carbon composite fiber mat as anode material for Li-ion battery.(LIB) The silicon precursor mixed with PAN was used for the electrospinning of the nanofibers. The treatment of stabilization of the PAN, reduction of the silicon precursor and carbonization of the fibers were conducted for the formation of the silicon/carbon composite fiber mat. A binder-free, conductive carbon-free and even without copper foil Si/C nanofiber mat as the anode was used for the study of LIB. The result shows that the capacity of 954 mAh/g at 0.1 C with high coulombic efficiency of 96.34 % after 20 cycles can be achieved.

並列關鍵字

Electrospinning ； C/Si composite fibers ； Hydrogen reduction ； Li-ion battery ； Anode material

參考文獻

[32] 黃宣諭，以電氣紡絲法製備具方向性纖維之管狀結構，國立交通大學機械工程學系碩士論文；2009。

[3] Lee SH, Kim Y, Kim Y. Effect of the concentration of sodium acetate (SA) on crosslinking of chitosan fiber by epichlorohydrin (ECH) in a wet spinning system. Carbohydrate Polymers. 2007;70(1):53-60.

[4] J. R. Dees JES. Structure development during melt spinning of linear polyethylene fibers. Journal of applied polymer science. 1974;18(4):1053-78.

[6] Whitesides GM, Grzybowski B. Self-assembly at all scales. Science. 2002;295(5564):2418-21.

[7] T. Ondarçuhu CJ. Drawing a single nanofibre over hundreds of microns. Europhys Lett. 1998;42(2):215-20.

國際替代計量

利用靜電紡絲法製備碳矽複合纖維並應用於鋰離子二次電池之負極材料

未授權

主題瀏覽