Hybrid vertical graphene/lithium titanate-CNTs arrays for lithium ion storage with extraordinary performances
In the present work, we report a synthetic strategy for the direct fabrication of hybrid vertical graphene/lithium titanateCNTs arrays via atomic layer deposition in combination with chemical vapor deposition. A novel array architecture is formed where active lithium titanate (Li4Ti5O12, LTO) is uniformly sandwiched by vertical graphene backbone and interconnected CNTs shell. Such hybrid omnibearing conductive network is identified to be an extremely stable porous structure and demonstrates superior ultrahigh-rate capability (146 mAh g-1 at 50 C and 131 mAh g-1 at 100 C) with a capacity of 136 mAh g-1 at 20 C after 10, 000 cycles when used as an electrode for lithium ion batteries. This special electrode construction strategy is expected to provide a way for the manufacture of an electrochemical energy storage with ultrahigh-rate and ultra-stability.