TY - JOUR
T1 - Graphene wrapped Cobalt/Tin bimetallic sulfides composites with abundant active facets and extended interlayer spacing for stable sodium/potassium storage
AU - Chen, Junjie
AU - Zhang, Yunfei
AU - Chen, Chen
AU - Tian, Nan
AU - Zhang, Qiuyu
AU - Zhang, Baoliang
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/8/15
Y1 - 2022/8/15
N2 - 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||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.
AB - 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||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.
KW - Graphene
KW - Lamellar structure
KW - Metal sulfides
KW - Sodium/potassium storage
UR - http://www.scopus.com/inward/record.url?scp=85127479306&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2022.136223
DO - 10.1016/j.cej.2022.136223
M3 - 文章
AN - SCOPUS:85127479306
SN - 1385-8947
VL - 442
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 136223
ER -