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Hybrid materials of CoFeO nanoparticles anchored on graphene prepared by a facile hydrothermal process was developed to be anode material for sodium-ion battery. The hybrid nano-structure of CoFeO/graphene not only could be useful to buffer electrode volume accompanying with Na insertion-extraction, but also could be beneficial to improve electrode electric conductivity and further keep graphene sheet separated to improve ion diffusion rate. Electrochemical measurements showed that the hybrid material anode displayed an excellent performance with a large reversible capacity of 330 mAh g after 75 cycle times and a satisfactory rate capability of 170 mAh g at 1 A g. [ABSTRACT FROM AUTHOR]

Nanocomposites of porous graphene anchored with Sb/SbO x nanoparticles were synthesized through a two-step wet chemical process. SbO x /graphene was initially prepared by refluxing SbCl 3 and graphene oxide in benzyl alcohol. Subsequently, the SbO x nanoparticles were partially reduced by NaBH 4 . The nanocomposites exhibited an enhanced performance for sodium-ion battery with a stable sodium-ion storage capacity of 311.6 mAh g −1 at 50 mA g −1 after 100 cycles and a rate capability of 205.6 mAh g −1 at 800 mA g −1 . Reduction of SbO x by adding moderate amount of NaBH 4 was conducive in improving the nanocomposite's electrochemical performance. The sodium-ion storage capacity of Sb/SbO x /graphene material was 1.4 times higher than that of SbO x /graphene without NaBH 4 and 6.2 times higher than that of Sb/graphene with excessive amount of NaBH 4 . [ABSTRACT FROM AUTHOR]