The surfaces of hydrophobic graphene nanosheets (GNs) are successfully decorated, aided by urea, with FePO4-based materials in an aqueous solution. The hydrophobic GNs can easily disperse in the aqueous solution without functionalization in the presence of urea, leading to the formation of a GNs-based nanocomposite with minimal sacrifice of the electrical conductivity of the GNs. Compared with reduced graphene oxide (rGO) decorated with FePO4H2O (FePO4H2O/rGO), synthesized using a graphene oxide (GO) substrate, the resulting FePO4H2O/GNs nanocomposite exhibit superior rate performance, because the GNs have a higher C/O ratio than the rGO. In addition, LiFePO4/GNs with high coulombic efficiency and energy efficiency, prepared using FePO4H2O/GNs, deliver a discharge capacity of 62mAhg-1 at 120C rate. Furthermore, a full cell consisting of LiFePO4/GNs and Li4Ti5O12/graphene exhibits excellent rate performance up to 60C rate.
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