研究生: |
鍾嘉寶 Pao-Chia Chung |
---|---|
論文名稱: |
磷酸鋰鐵陰極複合材料之製備與性能分析 Preparation of LiFePO4 Composite Cathode Material and Performance Analysis |
指導教授: |
江慧真
Hui-Jean Chiang |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
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論文出版年: | 2011 |
畢業學年度: | 99 |
語文別: | 中文 |
論文頁數: | 95 |
中文關鍵詞: | 萘磺酸 、聚亞乙胺 |
外文關鍵詞: | NSFC, PEI |
相關次數: | 點閱:1 下載:0 |
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本論文利用硫酸亞鐵/雙氧水與磷酸/氨水,pH控制在2,進行沉澱,其中添加不同分散劑/被覆劑以生成磷酸鐵前驅物,再與碳酸鋰依一定的比例混合研磨,經700℃高溫燒結,燒結時加入碳源,在氮氣氣氛下,得到結晶性良好的橄欖石狀磷酸鐵鋰。
研究結果顯示:在分散劑的選用上,都能達到良好的分散效果,粒徑均在100nm以下;添加PEI被覆劑能提高電容量,但分散劑與PEI被覆劑同時搭配,不見得獲得更好的效果,其中以NSFC與PEI搭配較果最佳,電容量可達到141 mAh/g。
In this project, we use ferrous sulfate / hydrogen peroxide and phosphoric acid / ammonia as the starting materials to produce iron phosphate precipitates under pH value in 2. After mixing with lithium carbonate in a certain percentage, the precursors were sintered at 700℃ in nitrogen. Then we obtained the crystal-like good olivine lithium iron phosphate. We also added different dispersants / iron phosphate coating agent in the precipitation process, to study the influence of electric properties of products.
The results indicated: the selected dispersant, can achieve a well dispersion, particle size in 100nm for all products. When adding PEI as the coating agent, the electric capacity of products can be improved. But if adding PEI coating agent with the dispersant in the same time, they did not necessarily obtain a better effect. Only in case of NSFC with PEI can be best, capacitance up to 141 mAh/g.
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