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標題: 電化學方法製備鋰鐵氧化物薄膜鋰電池材料之研究
作者: Chen, Chi-Chih
關鍵字: Electrolytic deposition;電化學沉積;LiFe5O8;lithium iron oxides;thin film lithium ion batteries;LiFe5O8;鋰鐵氧化合物;薄膜鋰離子電池
出版社: 材料科學與工程學系所
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The preparation of lithium iron oxides thin film on 304 stainless steel was carried out in the mixture of 0.01 M Fe(NO3)3.9H2O and 0.1 M Li(NO3) aqueous solutions for electrodes in thin film lithium-ion batteries. Through cathodic polarization tests, the optimum deposition condition was found at -1.0 V vs Ag/AgCl. LiFe5O8 and Fe2O3 were found after annealed at 250 ℃. The crystallinity was increased with annealing temperature, and the particle size was also increased from 13 nm (250 ℃) to 58 nm (450 ℃). Cyclic voltammetry (CV) measurements show oxidation peaks at 3.1 V, 2.1 V, 1.7 V and 1.1 V and reduction peaks at 1.6 V, 1.0 V and 0.62V (vs. Li/Li+), respectively. There was no obvious plateau was observed at 4.5 V-1.5 V (vs. Li/Li+). However, the plateau around 1.0 V (vs. Li/Li+) was observed by discharge tests. The compound of LiFe5O8 and Fe2O3 was suitable for anode. The LiFe5O8 doped Fe2O3 revealed better specific capacity and cyclic reversibility than pure Fe2O3. The specific capacity was decreased with increasing current density, due to the aggregation of particles and the growth of crystal.

本研究利用電化學沉積方式於0.01 M Fe(NO3)3.9H2O混合0.1 M Li(NO3)水溶液中將鋰鐵氧化合物製備於304不銹鋼基材上應用於薄膜鋰離子電池電極材料上。在陰極極化曲線探討中,最佳沈積電壓為-1.0 V。在250 ℃熱處理後生成LiFe5O8及Fe2O3的結晶,並隨著熱處理溫度增加,其結晶性亦愈高,其顆粒尺寸從13 nm (250 ℃)到58 nm (450 ℃)。半電池經循環伏安(CV)測試,氧化電位分別為3.1 V、2.1 V、1.7 V和1.1 V (vs. Li/Li+),還原電位分別為1.6 V、1.0 V和0.62 V (vs. Li/Li+)。在進行充放電時,並無明顯放電平台在4.5 V-1.5 V (vs. Li/Li+) 區間,但是在1.0 V (vs. Li/Li+) 附近有明顯放電平台,所以適合應用在負極材料。從與純Fe2O3比較上可以得知LiFe5O8 摻雜於Fe2O3可以增加電容量及循環壽命。當提高充放電電流密度電容量會明顯衰退,顯然是因為顆粒聚集及晶粒粗化所造成。
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