| 内容提要: |
Li4Ti5O12 ultra-fine powders synthesized via hydrothermal method were coated by amphiphilic carbonaceous material (ACM) in aqueous solutions. SEM, TEM and XRD results showed that the surfaces of the spinel Li4Ti5O12 were uniformly covered by ACM coating layer after modification, which could obviously improve the electrical conductivity, effectively reduced the resistance and polarization of the material. The ACM modified Li4Ti5Ol2 powders calcined at 800℃ for 2h were comprised of crystallites with the particle size in the range of 100-300nm, revealing high dispersivity and almost without any agglomerates. Electrochemical measurements were then carried out to evaluate the anode performances of samples in lithium-ion batteries. Its initial discharge capacities at 1C and 20C rates were 181.2 m Ahg-1 and 137.1 m Ahg-1 , respectively, evincing good rate capability. Meanwhile, its capacitance remained as high as 130.3m Ahg-1 at 20C after 50 cycles charge/discharge tests, exhibiting good cyclic performance. The non-organic coating method presented a new e conomic, facile, and green p athway for carbon modified Li4Ti5O12 as high power anode material in lithium-ion batteries. |