溶膠凝膠法製備五氧化二釩之鋰二次電池用陰極材料

Preparation of Vanadium Pentoxide Electrode Materials by Sol-Gel Method for Rechargeable Lithium Battery

張建民(Chien-Ming Chang)

指導教授 ： 陳玉惠

中原大學/理學院/化學研究所/碩士(2006年)

https://doi.org/10.6840/cycu200600527

摘要

本研究係探討以離子熔液(ionic liquid)為模板，利用溶膠凝膠法製備五氧化二釩之可行性及其性質。氮氣吸脫附曲線顯示，所製備之五氧化二釩屬於第三類型吸脫附曲線，且其比表面積會依VO(OC3H7)3/H2O/acetone/ionic liquid組成比例的不同而改變。從化學及結構研究中發現，所製備之五氧化二釩呈現低密度中孔洞之纖維狀形態，並含3.1到6.1莫耳的結晶水。在XRD鑑定其結晶結構方面得知，在室溫下製備出的五氧化二釩呈近似非結晶相，然而在4000C下燒結後，五氧化二釩呈斜方晶結構。電化學分析結果顯示，五氧化二釩之比表面積升高，其導電度及電容量隨之增加。此外，添加導電高分子PPy所製備之五氧化二釩(V2O5/PPy)，其氮氣吸脫附圖亦與所製備的五氧化二釩同為第三類型吸脫附曲線，顯示其有類似孔洞結構。電化學分析顯示，(V2O5/PPy)有較高的導電度且其電容亦高於純五氧化二釩。本研究顯示所製備之五氧化二釩及(V2O5/PPy)有成為電極材料之潛能。

關鍵字

鋰二次電池 ； 溶膠凝膠 ； 五氧化二釩

並列摘要

In this study, the mesoporous vanadium pentoxide was successfully prepared by the sol-gel polymerization with an ionic liquid as the template under ambient pressure. It was found that the N2 adsorption/desorption isotherm diagram of as-prepared vanadium pentoxide belonged to a typical type-Ш curve and the surface area was varied with the composition of VO(OC3H7)3, H2O, acetone and ionic liquid applied. The results of the chemical and structure investigation indicated that the as-prepared vanadium pentoxide were low density mesoporous aerogel-like sol-gels with fibrous network. Besides, they were found to be in the hydrated form with structure of V2O5．nH2O, n = 3.1-6.1. The XRD pattern showed that the vanadium pentoxide was amorphous-like at room temperature but became orthorhombic after sintering at 4000C. The electrochemical analysis indicated that the electrical conductivity and the corresponding capacity of the vanadium pentoxide increased with increasing the surface area. Furthermore, the V2O5/polypyrrole mesoporous hybrid gel was also prepared. Similar to that of V2O5 the N2 adsorption/desorption isotherm diagram also showed a typical type-Ш curve for the as-prepared V2O5/PPy, indicating a similar porous structure. The result of electrochemical analysis showed that the conductivity and capacity of V2O5/PPy were both higher than that of the corresponding V2O5 with similar surface area. The results revealed that the as-prepared vanadium pentoxide and V2O5/PPy can be potential electrode materials for lithium rechargeable batteries.

並列關鍵字

Sol-Gel ； V2O5

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