1. Preparation of reduced graphene oxide@nickel oxide nanosheets composites with enhanced lithium-ion storage performance.
- Author
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Ren, Haibo, Wen, Ziying, Chen, Shuai, Liu, Jinyun, Joo, Sang Woo, and Huang, Jiarui
- Subjects
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GRAPHENE oxide , *HEAT treatment , *ELECTRIC conductivity , *LITHIUM-ion batteries , *HEAT of reaction , *GRAPHITE oxide , *POROUS materials - Abstract
Reduced graphene oxide@nickel oxide (NiO) composites were prepared through a simple hydrothermal reaction combined with a heat treatment. The reduced graphene oxide@NiO composites are composed of NiO nanosheets uniformly attaching on both sides of cross-linked reduced graphene oxide. Some favorable electrochemical performances in specific capacity, cycling performance, and rate capability are achieved using the porous nanocomposites as an anode for lithium-ion batteries. And the reversible specific capacity can reach up to1023 mAh g−1 at 400 mA g−1 after 200 cycles. A full cell consists of a commercial LiCoO 2 cathode and the reduced graphene oxide NiO@-3 nanocomposites anode, is able to hold a high capacity of 772 mAh g−1 at 400 mA g−1 after 200 cycles. The three-dimensional reduced graphene oxide plays a key role in enhancing the electrical conductivity of the electrode materials; and it effectively prevents the NiO nanoparticles from dropping off the electrode and buffers the volume variation during the discharge-charge process. The reduced graphene oxide@NiO nanocomposites present a great potential to be a promising electrode material in the near future for lithium-ion batteries. Image 1 • NiO nanosheets anchoring on rGO composite was developed. • It involves immersing and hydrothermal process followed by thermal treatment. • The hierarchical rGO@NiO anodes exhibit high stable capacity and rate performance. • High performance is ascribed to the special hierarchical rGO@NiO nanocomposites. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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