TiNb 2 O 7 /graphene composites as high-rate anode materials for lithium/sodium ion batteries

Layered TiNb ₂ O ₇ /graphene composites (TNO/G) are synthesized through a simple freeze drying process. Such a sandwiched structure combined advantages of graphene sheets and TiNb ₂ O ₇ (TNO) exhibiting much enhanced rate performance, storage capacity and cycling stability for both lithium and sodium ion insertion.