Electrochemical synthesis of tin-doped multi-walled carbon nanotubes and their application to lithiu

• 作 者: 许茜
• 机 构: 东北大学,
• 出 处: 材料与冶金学报
• 发表日期: 2006年04期
• 关键词: nanotubes walled lithium battery graphite SAED cathode insertion sized absorb

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 1762mAh/g and 1295mAh/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.

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 the 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 1  762  mAh / g and 1  295 mAh / 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.