MCFC隔膜用γ-LiAlO_2 粗细匹配料制备研究

Study on Preparation of Coarse and Fine γ-LiAlO_2 Mixed Powder Used for MCFC Matrix

用高温反应法制得γ_LiAlO2 粗料 .另用氯化物法先制得α_LiAlO2 细料 ,此细料在 90 0℃焙烧几小时 ,它首先转化为中间过渡型 (无定型 ) ,进而再转化为γ_LiAlO2 超细料 .其粒度 <0 .18μm ,BET比表面积 >43m2 /g .用带铸法把以上γ_LiAlO2 粗细匹配料制得MCFC隔膜 .用此膜组装的电池性能较高 ,在 2 0 0和 30 0mA/cm2 放电时 ,电池输出电压分别为 0 .85V和 0 .75V时 ,功率密度高达 2 5 0mW /cm2 等 .用匹配料制得膜性能明显优于用单一粗料制得的膜 .粗细料制备工艺过程和匹配是成功的 .

Coarse α_LiALO 2 powder was transferred completely to γ_LiAlO 2 at 900 ℃ for ten hours.Fine γ_LiAlO 2 powder was prepared by “chloride” synthesis. MCFC matrix was fabricated by mixing the coarse and fine γ_LiAlO 2 powder and by tape cast.The out'put voltage of the cell assembled with the matrix was 0.85 and 0.75 V respectively at 200 and 300 mA/cm 2,and power density was about 250 mW/cm 2.The performance of the matrix fabricated with the mixed powder was obviously more advanced than that of the matrix fabricated with only coarse γ_LiAlO 2 powder.