Engineering Pocket-Like Graphene–Shell Encapsulated FeS_2: Inhibiting Polysulfides Shuttle Effect in Potassium-Ion Batteries

Chen Bochao; Ding Jiawei; Bai XiangrenZhang HanwenLiang MingZhu ShanShi ChunshengMa LiyingLiu EnzuoZhao NaiqinHe FangZhou WeiHe Chunnian

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Engineering Pocket-Like Graphene–Shell Encapsulated FeS_2: Inhibiting Polysulfides Shuttle Effect in Potassium-Ion Batteries

机译：Engineering Pocket-Like Graphene–Shell Encapsulated FeS_2: Inhibiting Polysulfides Shuttle Effect in Potassium-Ion Batteries

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Resource-rich FeS2 is a promising anode for potassium-ion batteries (PIBs). However, polysulfides emerge due to FeS2 conversion during discharging, which dissolve into the ether-based electrolyte and cause the continuous capacity degradation in PIBs. To address the polysulfides dissolution in PIBs, a graphene-shell-encapsulated FeS2 is fabricated and embedded in N/S codoped 3D hollow carbon spheres. As a protective pocket, the graphene-shell can effectively accommodate polysulfides inside the core-shell, inhibiting the polysulfides shuttle effect to enhance cycle stability of electrode. The density functional theory (DFT) calculations demonstrate that graphene-shells have a strong adsorption capacity for polysulfides, and the interfacial interaction between KFeS2 and graphene-shell can boost the K ion mobility. As a result, the composite exhibits superior-rate properties (524 and 224 mA h g(-1) at 0.1 and 8 A g(-1), respectively) and long-term cycle stability. This work demonstrates the promotion and protective effect of the graphene-shell for the FeS2 to storage K from both experimental and computational perspectives. These research outputs can provide guidance for designing other metal-based sulfide electrodes for PIBs.

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来源
《Advanced functional materials》 |2022年第14期|2109899.1-2109899.11|共11页
作者
Chen Bochao; Ding Jiawei; Bai XiangrenZhang HanwenLiang MingZhu ShanShi ChunshengMa LiyingLiu EnzuoZhao NaiqinHe FangZhou WeiHe Chunnian;
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作者单位

Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China;

Tianjin Univ, Joint Sch Natl Univ Singapore & Tianjin Univ, Int Campus, Fuzhou 350207, Peoples R China;

Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China|Tianjin Univ, Joint Sch Natl Univ Singapore & Tianjin Univ, Int Campus, Fuzhou 350207, Peoples R ChinaTianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China|Tianjin Univ, Joint Sch Natl Univ Singapore & Tianjin Univ, Int Campus, Fuzhou 350207, Peoples R China|Tianjin Univ, Tianjin Key Lab Composite & Funct Mat, Tianjin 300350, Peoples R ChinaTianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China|Tianjin Univ, Tianjin Key Lab Composite & Funct Mat, Tianjin 300350, Peoples R ChinaTianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China|Tianjin Univ, Tianjin Key Lab Composite & Funct Mat, Tianjin 300350, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300072, Peoples R ChinaTianjin Univ, Dept Appl Phys, Tianjin Key Lab Low Dimens Mat Phys & Preparing T, Sch Sci, Tianjin 300072, Peoples R China;

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正文语种英语
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core-shell structure; DFT calculations; FeS; (2); polysulfides; potassium-ion batteries;

Engineering Pocket-Like Graphene–Shell Encapsulated FeS_2: Inhibiting Polysulfides Shuttle Effect in Potassium-Ion Batteries

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