Carbon-Coated Li[sub 4]Ti[sub 5]O[sub 12] as a High Rate Electrode Material for Li-Ion Intercalation

is a promising electrode material for high power density lithium-ion batteries and hybrid supercapacitors, but has the drawback of low electrical conductivity. We report a thermal vapor decomposition method to coat a uniform nanothickness graphitized-carbon on the particle surface. The resulting product coated at 800°C has a thick carbon layer and a electrical conductivity of , which is much higher than that of raw . As a result, it shows much better rate capability when used as a negative electrode for electrochemical supercapacitors. AC impedance measurements reveal that the carbon-coated has smaller charge-transfer resistance due to large effective interface reaction area.