Nano-size NiS particles anchored on nitrogen-doped reduced graphene oxide for superior sodium storage

•Highly dispersed nano-size NiS nanoparticles anchoring on nitrogen-doped reduced graphene oxide was prepared.•The NiS@N-rGO electrodes exhibited a superior electrochemical performance.•A high reversible capability of 210.9 mAh g−1 at 5 A g−1 could be achieved. [Display omitted] Nickel sulfides are...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-12, Vol.888, p.161316, Article 161316
Main Authors: Zhang, Shunjiang, Wang, Ruirui, Cao, Ronggen, Fang, Fang
Format: Article
Language:English
Subjects:
Anodes
Current density
Electrode materials
Graphene
Hybrid composites
Ion diffusion
Nanoparticles
Nickel sulfide
Nitrogen
Rechargeable batteries
RGO nanosheet
Sodium-ion batteries
Sulfidation
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Summary:•Highly dispersed nano-size NiS nanoparticles anchoring on nitrogen-doped reduced graphene oxide was prepared.•The NiS@N-rGO electrodes exhibited a superior electrochemical performance.•A high reversible capability of 210.9 mAh g−1 at 5 A g−1 could be achieved. [Display omitted] Nickel sulfides are regarded as promising anode materials for sodium-ion battery due to their natural abundance and high theoretical capacity. However, they are subjected to poor conductivity and severe volume variation during charging/discharging process, leading to sluggish kinetics and rapid capacity loss. To address these dilemmas, a hybrid composite consisting of nickel sulfide nanoparticles uniformly anchored on the nitrogen-doped reduced graphene oxide (NiS@N-rGO) has been fabricated through a facile sulfidation of ultrathin Ni(OH)2/rGO precursor. Owing to the high electronic conductivity of composite, alleviated volume expansion and accelerated ion diffusion, the NiS@N-rGO composite exhibits an initial specific capacity as high as 872.8 mAh g−1 at a current density of 0.2 A g−1 and maintain 300 mAh g−1 at a current density of 1 A g−1 after 300 cycles when employed as anode in sodium-ion batteries (SIBs). This work may present a new avenue in the design of electrode materials with excellent performance for SIBs in the future.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.161316