▎ 摘　　要

Spinel lithium titanate (Li4Ti5O12) is deemed as a promising anode material for high-rate and long-cycle lithium-ion batteries, but its practical application is hindered by its poor electrical conductivity and rel-atively low capacity. In this work, large-scale two-dimensional (2D) graphene-based Li4Ti5O12 with hier-archical pore structure is fabricated by controllable synthesis of amorphous TiO2 nanofilms on graphene and subsequent conversion to nanoparticle-assembled Li4Ti5O12 nanosheet by reaction with LiOH at high temperature. The small nanoparticle composition (6-10 nm) and designed micro-mesopores (1.3-1.6 and 2.7-3.4 nm) of Li4Ti5O12 nanosheets not only facilitate the Li+ diffusion, but also offer a large interface for Li (+) adsorption and provide considerable pseudocapacitive Li storage for Li4Ti5O12 . Meanwhile, the graphene substrate serves as conductive support and preserves this 2D shape structure during cycling. Therefore, this hierarchically structured Li4Ti5O12 composite exhibits superior reversible capacity and cy-cling stability at high rates (e.g., 168 mA h g-1 at 10 C after 10 0 0 cycles). This newly developed method can be employed in the design of high-performance 2D structural materials for energy storage and con-version devices. (c) 2021 Elsevier Ltd. All rights reserved.