C arbon-based rechargeable batteries have gained extensive attention, particularly after the commercialization of the Li-ion battery from Sony laboratories, 1 wherein metallic lithium is replaced by a carbon host structure that can reversibly absorb and release lithium ions at low electrochemical potentials. There have been several efforts to increase the energy density and specific capacity of these cells by using many types of industrially available and heat-treated carbons.2Ϫ5 Chemical dopants in carbon materials such as phosphorus, 6Ϫ8 boron, 9Ϫ11 and boronϪnitrogen 12,13 showed a substantial increase in specific capacity relative to pure carbon structures. Several research attempts focused on developing carbon nanotubes based energy storage/conversion devices are still under development stage.14Ϫ20 All the graphitic forms of carbon including zero-dimensional fullerenes, one-dimensional carbon nanotubes, and three-dimensional graphite are essentially derived from the two-dimensional, single atomic layer, graphene structure. 21 The twodimensional graphene has been considered as a potential electrode material for Liion battery applications, primarily due to its superior electrical conductivity, high surface area, and a broad electrochemical window.22Ϫ25 Recent reports have shown it to be a promising electrode material for electrochemical devices such as Li-ion batteries, supercapacitors, and so on. Chemical reduction of graphite oxide resulting in high surface area (few layer) reduced GO has been the predominant method of synthesis of graphene electrodes for Li battery applications. After the synthesis of reduced GO powder an additional step of coating this electrode material on to the current collector is required for thin film battery fabrication. The weak adherence between the electrode and current collector results in a poor electron transport and loss of electrical contact on extended cycling. Hence, there is a need for direct fabrication of graphene electrode materials on current collector substrates. The atomically thin nature and high surface area of the graphene electrodes grown directly on current collector substrates make them an excellent choice for electrodes in Li-ion high power thin film batteries.Further, nitrogen-and boron-doped graphene structures have attracted considerable interest in the field of electronics.26Ϫ28 Like other doped carbon forms, nitrogen-doped graphene is expected to have enhanced Li-battery properties. 13 Reports on the synthesis of nitrogendoped graphene are very scarce, and hence, developing a simple method to synthesize N-doped graphene is noteworthy. Recently, we were successful in synthesizing a new form of 2D atomic film consisting of hybridized h-BN and C by a chemical vapor deposition technique. 29 Hence, it is of fundamental interest to investigate how N-doping in graphene affects Li interaction properties when compared to pristine graphene. With
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