期刊
CHEMICAL ENGINEERING JOURNAL
卷 442, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136223
关键词
Metal sulfides; Graphene; Lamellar structure; Sodium/potassium storage
资金
- National Natural Science Foundation of China [21975206]
Graphene-wrapped cobalt/tin bimetallic sulfides composites show superior electrochemical performance for sodium/potassium ion storage.
In this work, graphene wrapped Cobalt/Tin bimetallic sulfides composites (Co1Sn6.75-sulfides/rGO, CSSG) were prepared via soft template-assisted solvothermal reactions, the electrostatic assembly and high-temperature calcination strategies. Compared with pure SnS, Co1Sn6.75-sulfides show extended interlayer spacings and abundant active facets, which can accelerate the intercalation/extraction of Na+/K+ and improve the diffusion kinetics. Graphene can increase the electrical conductivity of composites and induce the formation of stable electrode/electrolyte interfaces. Therefore, CSSG exhibit superior cycle performance (391.7 mAh/g at 2.0 A/g after 1000 cycles, 240 mAh/g at 5.0 A/g over 5000 cycles) and outstanding rate capability (326.3 mAh/g at 10.0 A/g) for sodium ion half-cells. In addition, Na3V2(PO4)(3)parallel to CSSG full-cells deliver a high reversible capacity of 339.3 mAh/g at 0.5 A/g after 100 cycles. Similarly, CSSG still exhibits high cycle capacities for potassium ion half-cells (306.6 mAh/g at 0.5 A/g after 1000 cycles). A variety of analysis methods and ex-situ characterizations are adopted to explore the diffusion kinetics of Na+/K+ and potassium storage mechanism. The structural evolution of CSSG during the long-term cycle process for sodium storage is investigated to analyze the capacity growth and attenuation.
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