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 1762 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.
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