Rapid synthesis of Li4Ti5O12/graphene composite with superior rate capability by a microwave-assisted hydrothermal method

• Li4Ti5O12/graphene has been synthesized by an advanced MW-HT method.
• Li4Ti5O12 microspheres composed of nanoflakes/particles wrapped in graphene sheets.
• A superior rate capacity, stable cycling and conductivity than Li4Ti5O12.

Li4Ti5O12 microspheres composed of nanoflakes wrapped in graphene nanosheets have been synthesized by an advanced microwave-hydrothermal (MW-HT) method for the preparation following by an annealing step. Microwave-assisted synthesis processes are appealing, as they can rapidly synthesize materials with a high degree of control of particle size and morphology at low cost. The resultant composite reveals a unique loose structure which could avoid the restacking of graphene sheets and offer rapid lithium ion diffusion paths. Therefore the Li4Ti5O12/graphene electrode has highly desirable properties: a specific capacity approaching the theoretical value, stable cycling, and exceptional rate capability. The composite also can be a good indicator of the remained charge and discharge capacity since it presents a curved charge and discharge line instead of a stable plateau.

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