Flexible free-standing graphene-TiO2 hybrid paper for use as lithium ion battery anode materials

Flexible and binder-free graphene-TiO2 paper was prepared by a simple route. A unique 3-D nano-structure was achieved with nano-sized TiO2 intercalated between graphene layers as pillars, significantly increasing the Li-ion insertion/extraction rate. At a current rate of 2 Ag-1, the specific capacity can reach 122 mAhg(-1) after 100 charge/discharge cycles. More remarkably, the flexible graphene/TiO2 hybrid paper shows an excellent stability when the rates decrease from 4 Ag-1 back to 200 mAg(-1) with the retained capacity of 175 mAhg(-1). (C) 2012 Elsevier Ltd. All rights reserved.