An orderly arrangement of layered carbon Nanosheet/TiO2 nanosheet stack with superior artificially interfacial lithium pseudocapacity

Poor rate capability and cyclability are the major barriers to using TiO 2 as the next generation anode material for high-performance lithium-ion batteries. In this study, a sandwich-like composite consisting of atomically defined two-dimensional (2D) carbon nanosheet is constructed by the confined synthesis in the galleries of layered TiO 2 nanosheet with the superior cycling and rate performances as the anode material for lithium-ion batteries. It is first experimentally revealed that the interfacial charge storage between unilamellar TiO 2 nanosheet and carbon nanosheet in the Carbon/TiO 2 nanosheet stack and the excellent structure stability during the discharge/charge process contribute to the superior performance of the composites. The resultant composite exhibits a high specific capacity (568 mAh g −1 ) with a specific energy of 407.4 Wh kg −1 at a specific power of 71.7 W kg −1 , and remains 88.0 Wh kg −1 at a specific power of 9.0 kW kg −1 . Apart from promising lithium-ion battery anode, this 2D Carbon/TiO 2 composite also has immense potential for applications in other areas such as sodium/potassium-ion batteries, supercapacitor , and catalysis.