Carbon coating,UV irradiation modification of lithium titanate and their electrochemical properties
Lithium titanate(Li4Ti5O12,abbreviated as LTO)has become an important anode material for lithium-ion batteries due to its structural"zero-strain"property.However,the low electronic conductiv-ity of lithium titanate limits its high-rate performance.In this paper,a light-assisted sol-gel method was proposed to prepare LTO/C anode materials,the effects of different carbon source ratios and light irradi-ation on the microstructure and electrochemical properties of LTO/C were investigated.Compared with the results of sucrose as the carbon source,the rate performance of the LTO/C with glucose as the car-bon source is better due to the higher degree of graphitized carbon coated on the surface of LTO.Under the UV irradiation condition,the reduction of LTO/C particle size makes the discharge specific capa-city of UV-irradiated LTO/C higher than that of LTO/C without UV irradiation at different rates.The discharge specific capacity of the LTO/C sample prepared with 20％ glucose as carbon source assisted with UV irradiation process reaches 101.5 mAhg-1 at 10 C.
NETL
NSTL
万方数据
