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
Using natural Na montmorillonite as the host clay, porous silica-pillared montmorillonites (Si-PILC) were prepared by the template synthesis method. Furthermore, the texture and structure of such composite materials w...Using natural Na montmorillonite as the host clay, porous silica-pillared montmorillonites (Si-PILC) were prepared by the template synthesis method. Furthermore, the texture and structure of such composite materials were investigated by using modern several physicochemical techniques such as powder X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Fourier Transformation Infra-red Spectra (FT-IR), and N2 adsorption/desorption measurements. The results reveal that tetrathylorthosilicate (TEOS) agent has been successfully intercalated into the montmorillonite and the characteristic d001 spacing of Si-PILC increases from 1.28nm to 3.15nm. The resultant products with large gallery height possess BJH pore volume as large as 0.30cm^3/g, remarkably high BET specific surface area of over 592.0m^2/g, pore size distribution in the mesopore region 3.3nm^4.3nm after thermal treatment at 800℃.展开更多
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%。
文摘Using natural Na montmorillonite as the host clay, porous silica-pillared montmorillonites (Si-PILC) were prepared by the template synthesis method. Furthermore, the texture and structure of such composite materials were investigated by using modern several physicochemical techniques such as powder X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Fourier Transformation Infra-red Spectra (FT-IR), and N2 adsorption/desorption measurements. The results reveal that tetrathylorthosilicate (TEOS) agent has been successfully intercalated into the montmorillonite and the characteristic d001 spacing of Si-PILC increases from 1.28nm to 3.15nm. The resultant products with large gallery height possess BJH pore volume as large as 0.30cm^3/g, remarkably high BET specific surface area of over 592.0m^2/g, pore size distribution in the mesopore region 3.3nm^4.3nm after thermal treatment at 800℃.
