▎ 摘　　要

Tetrabutyl titanate and graphite oxide were dispersed in tertbutanol by ultrasonication and then added the lithium acetate solution into the above mixed solution under the microwave radiation to produce spinel Li4Ti5O12 (LTO) precursor/graphene oxide. On the one hand, the microwave radiation will promote the hydrolysis of tetrabutyl titanate, thus the reaction for forming the precursor can be completed in 15 min. On the other hand, "soft template" confinement effect of tertbutanol leads to form the LTO precursor with very small particle size and uniform morphology. Meanwhile, small LTO precursor particles will fully embed the graphene oxide nanosheets through their second agglomeration. Finally, the LTO precursor/graphene oxide was calcined at 800 degrees C for 8 h to obtain spinel LTO@graphene (LTO@G). The study shows that LTO crystal in the LTO@G has a diameter of 0.2 similar to 1.5 mu m and the tap density of LTO@G reached 1.7 g . cm(-3). The graphene is located inside the crystal and significantly improve the electronic conductivity. The conductivity of LTO@G was found to be 1.84x 10(-3) S.m(-1), which is remarkably higher than pure phase LTO (1.1 x 10(-7) S . m(-1)). In 1C and 4C, the first discharge specific capacitances of LTO@G was found to be 170.1 mAh . g(-1) and 97.5 mAh . g(-1), respectively. These results demonstrated that the LTO@G has good high-rate capability and tap density, it can be widely used in various commercial lithium ion battery.