Tin-doped multiwall carbon nanotubes (CNTs) were prepared by electrolysis in molten salt of LiCl (62%)-NaCl(37%)-SnCl2(1%) in mass fraction with a graphite rod as a cathode. TEM and XRD investigations show that struct...Tin-doped multiwall carbon nanotubes (CNTs) were prepared by electrolysis in molten salt of LiCl (62%)-NaCl(37%)-SnCl2(1%) in mass fraction with a graphite rod as a cathode. TEM and XRD investigations show that structure characteristic of tin-doped CNTs is webs of well-graphitized hollow tubes with outer diameters between 10 and 20 nm with presence of Sn and SnO2. The EDS elementary analysis confirms the content of tin in the products was 9%. Electrochemical Li insertion into the doped CNTs was investigated in a nonaqueous medium. Galvanostatic discharge-charge measurement revealed that their specific capacities of insertion and extraction lithium were 1762mAh/g and 1295mAh/g, respectively, in the first cycle with almost coulomb efficiency of 73%. The coulomb efficiency increased to more than 90% after the ninth cycle, and the reversible capacity was about 210 mAh/g.展开更多
文摘Tin-doped multiwall carbon nanotubes (CNTs) were prepared by electrolysis in molten salt of LiCl (62%)-NaCl(37%)-SnCl2(1%) in mass fraction with a graphite rod as a cathode. TEM and XRD investigations show that structure characteristic of tin-doped CNTs is webs of well-graphitized hollow tubes with outer diameters between 10 and 20 nm with presence of Sn and SnO2. The EDS elementary analysis confirms the content of tin in the products was 9%. Electrochemical Li insertion into the doped CNTs was investigated in a nonaqueous medium. Galvanostatic discharge-charge measurement revealed that their specific capacities of insertion and extraction lithium were 1762mAh/g and 1295mAh/g, respectively, in the first cycle with almost coulomb efficiency of 73%. The coulomb efficiency increased to more than 90% after the ninth cycle, and the reversible capacity was about 210 mAh/g.
