Si nanoparticles veiled with ultrathin rGO film reduced directly by precoated Ni template: Fabrication and electrochemical performance
01 natural sciences
7. Clean energy
0104 chemical sciences
DOI:
10.1016/j.apsusc.2020.146993
Publication Date:
2020-06-16T15:46:05Z
AUTHORS (4)
ABSTRACT
Abstract Si/graphene composite has been considered as a promising structure to limit the volume expansion and improve poor conductivity of silicon anode. Herein, a novel method to prepare Si/reduced graphene oxide (Si/rGO) composite anode was proposed. With this approach, nickel shell was pre-coated on Si particles via electroless deposition before used as a template to in-situ reduce GO. During the reduction process, the nickel template can as well promote the self-assembly of graphene sheets on the surface of Si nanoparticles. Following these facile and convenient processes, a Si/rGO hybrid-structure can be directly fabricated. Compared with pure Si anode, this Si/rGO composite displays a greatly improved electrochemical performance in both cycling stability and rate capability. It delivers a reversible capacity as high as 975 mA h g−1 and 717 mA h g−1 after 300 cycles under the current densities of 1 A g−1 and 3 A g−1, respectively. Meanwhile, its capacity can still maintain at 602 mA h g−1 even at a rather higher current of 5 A g−1.
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