通过改性由酸蚀二维蛭石制备的二维二氧化硅,得到带正电荷的二维介孔二氧化硅(PSN+)纳米片,并将PSN+用作聚环氧乙烷(PEO)基固体聚合物电解质(SPEs)的填料。由于PSN+具有丰富的正电荷,PSN^(+)与锂盐解离的阴离子能够有效结合,从而促进锂...通过改性由酸蚀二维蛭石制备的二维二氧化硅,得到带正电荷的二维介孔二氧化硅(PSN+)纳米片,并将PSN+用作聚环氧乙烷(PEO)基固体聚合物电解质(SPEs)的填料。由于PSN+具有丰富的正电荷,PSN^(+)与锂盐解离的阴离子能够有效结合,从而促进锂离子的运输,获得较好的锂离子转移数。在50℃时,基于PSN^(+)的SPEs表现出较高的离子电导率(7.5×10^(-5)S·cm^(-1)),锂离子迁移数为0.30,稳定电压窗为4.41 V。因此,组装后的LiFePO_(4)锂电池在50℃、0.2C下具有优异的初始放电比容量(155.7 m Ah·g^(-1)),在循环100次后容量保持率为97.1%。展开更多
Natural rutile and gaseous chlorine with carbon as reductant were used to prepare titanium tetrachloride. Thermodynamics and kinetics of chlorination of Kenya natural rutile particles in a batch-type fluidized bed wer...Natural rutile and gaseous chlorine with carbon as reductant were used to prepare titanium tetrachloride. Thermodynamics and kinetics of chlorination of Kenya natural rutile particles in a batch-type fluidized bed were studied at 1173-1273 K. Thermodynamic analysis of this system revealed that the equation of producing CO was dominant at high temperatures. Based on the gas-solid multi-phase reaction theory and a two-phase model for the fluidized bed, the mathematical description for the chlorination reaction of rutile was proposed. The reaction parameters and the average concentration of gaseous chlorine in the emulsion phase were estimated. The average concentration of emulsion phase in the range of fluidized bed was calculated as 0.3 mol/m^3. The results showed that the chlorination of natural rutile proceeded principally in the emulsion phase, and the reaction rate was mainly controlled by the surface reaction.展开更多
将一维碳纳米管(CNT)和二维蒙脱土(MMT)纳米片复合并用于修饰商用聚丙烯(PP)隔膜。得益于碳纳米管的高电子导电性,以及MMT对多硫化物(LiPS)的强吸附能力和低的锂离子传输势垒,所得的交联多孔CNT-MMT复合阻挡层具有优异的结构稳定性和高...将一维碳纳米管(CNT)和二维蒙脱土(MMT)纳米片复合并用于修饰商用聚丙烯(PP)隔膜。得益于碳纳米管的高电子导电性,以及MMT对多硫化物(LiPS)的强吸附能力和低的锂离子传输势垒,所得的交联多孔CNT-MMT复合阻挡层具有优异的结构稳定性和高的锂离子传输能力,表现出抑制LiPS穿梭的性能,因此实现了高硫利用率。结果表明,该复合阻挡层修饰的PP隔膜有效提升了锂硫电池的锂离子扩散系数、放电比容量和循环稳定性。所组装锂硫电池的0.1 C初始放电比容量为1373 mAh g^(-1),且具有良好的循环稳定性,在1 C下经500次循环后其每圈容量衰减率仅为0.062%。展开更多
文摘通过改性由酸蚀二维蛭石制备的二维二氧化硅,得到带正电荷的二维介孔二氧化硅(PSN+)纳米片,并将PSN+用作聚环氧乙烷(PEO)基固体聚合物电解质(SPEs)的填料。由于PSN+具有丰富的正电荷,PSN^(+)与锂盐解离的阴离子能够有效结合,从而促进锂离子的运输,获得较好的锂离子转移数。在50℃时,基于PSN^(+)的SPEs表现出较高的离子电导率(7.5×10^(-5)S·cm^(-1)),锂离子迁移数为0.30,稳定电压窗为4.41 V。因此,组装后的LiFePO_(4)锂电池在50℃、0.2C下具有优异的初始放电比容量(155.7 m Ah·g^(-1)),在循环100次后容量保持率为97.1%。
基金Projects(51374064,51004033,51074044)supported by the National Natural Science Foundation of ChinaProject(2012AA062303)supported by High-tech Research and Development Program of China
文摘Natural rutile and gaseous chlorine with carbon as reductant were used to prepare titanium tetrachloride. Thermodynamics and kinetics of chlorination of Kenya natural rutile particles in a batch-type fluidized bed were studied at 1173-1273 K. Thermodynamic analysis of this system revealed that the equation of producing CO was dominant at high temperatures. Based on the gas-solid multi-phase reaction theory and a two-phase model for the fluidized bed, the mathematical description for the chlorination reaction of rutile was proposed. The reaction parameters and the average concentration of gaseous chlorine in the emulsion phase were estimated. The average concentration of emulsion phase in the range of fluidized bed was calculated as 0.3 mol/m^3. The results showed that the chlorination of natural rutile proceeded principally in the emulsion phase, and the reaction rate was mainly controlled by the surface reaction.
文摘将一维碳纳米管(CNT)和二维蒙脱土(MMT)纳米片复合并用于修饰商用聚丙烯(PP)隔膜。得益于碳纳米管的高电子导电性,以及MMT对多硫化物(LiPS)的强吸附能力和低的锂离子传输势垒,所得的交联多孔CNT-MMT复合阻挡层具有优异的结构稳定性和高的锂离子传输能力,表现出抑制LiPS穿梭的性能,因此实现了高硫利用率。结果表明,该复合阻挡层修饰的PP隔膜有效提升了锂硫电池的锂离子扩散系数、放电比容量和循环稳定性。所组装锂硫电池的0.1 C初始放电比容量为1373 mAh g^(-1),且具有良好的循环稳定性,在1 C下经500次循环后其每圈容量衰减率仅为0.062%。
