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Huang Y.,Northwestern Polytechnical University | Chen X.,Northwestern Polytechnical University | Zhang K.,Shijiazhuang Institute of Mechanical Engineering | Feng X.,Northwestern Polytechnical University
Ceramics International | Year: 2015

Flower-like ZnO-NiO mesoporous architectures were synthesized through annealing the zinc hydroxide carbonate-nickel hydroxide carbonate composite precursor, which was prepared via a one-pot hydrothermal route. More importantly, we successfully prepared flower-like porous ZnO-NiO/graphene composites by introducing flexible graphene into the flower-like porous ZnO-NiO. In addition, we explore the application of the 3D flower-like ZnO-NiO composite mesoporous architectures and flower-like porous ZnO-NiO/graphene composites as anode materials for lithium ion battery. Electrochemical study presented that the as-prepared flower-like porous ZnO-NiO/graphene composites demonstrate excellent electrochemical performance and cycling stability. The first discharge capacity is 1205.7. mA. h/g at a high current density of 300. mA/g. After 50 cycles, the reversible capacity is 452.7. mA. h/g at a current density of 300. mA/g and the coulomb efficiency reaches at 99%.The improved electrochemical performances are mainly attributed to its morphological characteristics of mesoporous, nanosheet self-assembling architectures, as well as the addition of graphene. These results suggest that such 3D flower-like porous ZnO-NiO/graphene composites are promising materials for lithium ion battery. © 2015 Elsevier Ltd and Techna Group S.r.l. Source


Huang Y.,Northwestern Polytechnical University | Chen X.,Northwestern Polytechnical University | Zhang K.,Shijiazhuang Institute of Mechanical Engineering | Feng X.,Northwestern Polytechnical University
Materials Letters | Year: 2015

Porous SnO2/NiO/graphene ternary composites had been synthesized. Used as anode materials for lithium ion batteries, graphene supported porous SnO2/NiO ternary composites demonstrate excellent electrochemical performance and cycling stability. The first discharge capacity is 1280.4 mAh/g at a high current density of 300 mA/g. After 50 cycles, the reversible capacity is 410.74 mAh/g and the coulomb efficiency reaches at 99.4%. © 2015 Elsevier B.V. All rights reserved. Source

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