Feiyu Kang

Structure and Electrochemical Properties of Zn-Doped Li4Ti5O12 as Anode Materials in Li-Ion Battery

Zinc-doped lithium titanates with the formula of Li 4-x Zn x Ti 5 O 12 (x = 0, 0.25, 0.5, 1) were synthesized as anode materials via a solid-state reaction. The phase composition does not change by Zn doping when x < 1 but results in the increase in the relative peak intensity ratio of I (311) /I (111) and I (400) /I (111) in X-ray diffraction. The conductivity is improved by Zn doping via the generation of mixing Ti 4+ /Ti 3+ . The specific capacity at 0.5C decreases by Zn doping, which is ascribed to the location of Zn 2+ at the 8a site; however, the capacity retention is improved remarkably compared to that of the undoped one when discharged at a high rate.

High-yield bamboo-shaped carbon nanotubes from cresol for electrochemical application

High-yield bamboo-shaped carbon nanotubes (BCNTs) have been produced by using cresol as the precursor, for the first time and there are almost no straight CNTs or amorphous carbon found in the product: the role of cresol in promoting the growth of BCNTs is discussed; improved cycle stability and electric conductivity of the BCNTs as an anode additive in a lithium ion battery are achieved.