High-rate Li4Ti5O12/porous activated graphene nanoplatelets composites using LiOH both as lithium source and activating agent

The Li 4 Ti 5 O 12 /activated graphene nanoplatelets (Li 4 Ti 5 O 12 /a-GNPs) composites are prepared via a low-cost, green, one-pot hydrothermal process by using LiOH both as lithium source and activating agent for the first time. The LiOH solution concentration and hydrothermal time are optimized to obtain the pure Li 4 Ti 5 O 12 /a-GNPs. The synergistic effects of the nanosized Li 4 Ti 5 O 12 and the three-dimensional porous a-GNPs endow the composites with convenient lithium ion diffusion channels and efficiently conductive structures for electron and ion transport. As anticipated, the Li 4 Ti 5 O 12 /a-GNPs deliver an outstanding rate capability of 125 and 113 mA h g −1 at 80 and 100 C, respectively, and an excellent cycling stability with 90.21% capacity retention after 2000 cycles at 10 C. These results are much better than those of the Li 4 Ti 5 O 12 /GNPs and pure Li 4 Ti 5 O 12 , demonstrating Li 4 Ti 5 O 12 /a-GNPs are promising anode materials for lithium-ion batteries of high current density applications.