電解法製備鋰鈷氧化物塗層之方法METHOD FOR FORMING ELECTROLYTIC LITHIUM COBALT OXIDE COATING

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

101124288

專利證號

I 437126

專利獲證名稱

電解法製備鋰鈷氧化物塗層之方法METHOD FOR FORMING ELECTROLYTIC LITHIUM COBALT OXIDE COATING

專利所屬機關 (申請機關)

國立中興大學

獲證日期

2014/05/11

技術說明

本發明成功地將LiCo2O4鋰鈷氧化合物製備塗層於304不銹鋼基材上應用於薄膜鋰離子電池正極材料上。所合成的LiCo2O4結晶，隨著提高熱處理溫度在500 ℃維持1小時後完全轉變成LT- LiCoO2相，並且觀察到Co3O4。LiCo2O4和LT- LiCoO2薄膜半電池經循環伏安 (CV) 測試，氧化電位分別為3.75 V和3.98 V (vs. Li / Li+)，還原電位分別為3.43 V和3.89 V (vs. Li/Li+)。LiCo2O4薄膜半電池在電壓3.2至3.8V之間以10 μA/cm2電流密度充放電20圈試驗中有著非常優良的循環性能。第一圈放電容量有75 mAh/g，第20圈放電容量還有71 mAh/g 。相對地LT- LiCoO2就沒有這麼好的循環性能。 A novel coating of lithium cobalt oxides on 304 stainless steel has been successfully prepared for electrodes applied in thin film lithium-ion batteries. Through cathodic polarization tests, XRD, TGA/DTA, and ESCA it was found that the coating film was the mixture of LiOH and Co(OH)2．H2O condensed into LiCo2O4 at 310 ℃, and transformed into LiCoO2 and Co3O4 at 500 ℃. The coated specimen annealed at 310 ℃ for 3 Hrs, was further characterized by electrochemical methods. Cyclic voltammetry revealed the oxidation peaks at 3.75 V and 3.98 V, and the reduction peaks at 3.43 V and 3.89 V (vs. Li/Li+) for the coated specimens annealed at 310 ℃ (LiCo2O4) and 500 ℃ (LT-LiCoO2), respectively. The charge-discharge results indicate that the discharge capacity of LiCi2O4 possessed great reversibility, revealing 75 for the first and 71 mAh/g for the 20th cycles, at 10 μA/cm2, between 3.8 and 3.2 V. (V.S. Li/Li+). However, LT-LiCoO2 revealed poor reversibility.

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本部(收文號1080029338)同意該校108年5月10日興產字第1084300302號函申請終止維護專利

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