▎ 摘　　要

We report a facile sol-gel approach to in situ synthesize a Li4Ti5O12/graphene/carbon nano-tubes (Li4Ti5O12/G/CNTs) hybrid material. The hybrid material consists of nanostructured Li4Ti5O12 particles and conductive second phases (graphene and CNTs), which is favorable to improve both of the Li+ and electronic conductivity of the spinel Li4Ti5O12. The CNTs in the hybrid material play a role as bridges, which can give more effectively conductive nets in the electrode by connecting the graphene and the Li4Ti5O12 particles that can not anchor on the surface of graphene. With the addition of 3 wt.% of graphene and CNTs, the Li4Ti5O12/G/CNTs hybrid material exhibits excellent rate capability and cycling performance. At the charge/discharge rate of 0.5 C, its initial discharge specific capacity is 174 mA h/g, which is very close to the theoretical value of the spinel Li4Ti5O12 (175 mAh/g), and even at a very high charge/discharge rate of 30.0 C, the Li4Ti5O12/G/CNTs hybrid material can still deliver a discharge specific capacity of 150 mAh/g. Moreover, only less than 1% discharge capacity loss over 100 cycles at 10.0 C is observed. The outstanding electrochemical performances of the nanosized Li4Ti5O12/G/CNTs hybrid material make it a promising anode material for high rate lithium ion batteries.