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Iron Selenide-Based Heterojunction Construction and Defect Engineering for Fast Potassium/Sodium-Ion Storage
Small ( IF 13.0 ) Pub Date : 2022-02-27 , DOI: 10.1002/smll.202107252 Zhen Kong 1 , Lu Wang 1 , Sikandar Iqbal 1 , Bo Zhang 1 , Bin Wang 1 , Jianmin Dou 2 , Fengbo Wang 1 , Yitai Qian 1 , Meng Zhang 1 , Liqiang Xu 1
Small ( IF 13.0 ) Pub Date : 2022-02-27 , DOI: 10.1002/smll.202107252 Zhen Kong 1 , Lu Wang 1 , Sikandar Iqbal 1 , Bo Zhang 1 , Bin Wang 1 , Jianmin Dou 2 , Fengbo Wang 1 , Yitai Qian 1 , Meng Zhang 1 , Liqiang Xu 1
Affiliation
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Suitable anode materials with high capacity and long cycling stability, especially capability at high current densities, are urgently needed to advance the development of potassium ion batteries (PIBs) and sodium ion batteries (SIBs). Herein, a porous Ni-doped FeSe2/Fe3Se4 heterojunction encapsulated in Se-doped carbon (NF11S/C) is designed through selenization of MOFs precursor. The porous composite possesses enriched active sites and facilitates transport for both ion and electron. Ni-doping is adopted to enrich the lattice defects and active sites. The Se–C bond and carbon framework endow integrity of the composite and hamper aggregation of selenide nano-particles during potassiation/de-potassiation. The NF11S/C exhibits exceptional rate performance and ultra-long cycling stability (177.3 mA h g−1 after 3050 cycles at 2 A g−1 for PIBs and 208.8 mA h g−1 after 2000 cycles at 8 A g−1 for SIBs). The potassiation/de-potassiation mechanism is investigated via ex-situ X-ray powder diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectrocopy and Raman analysis. PTCDA//NF11S/C full cell stably cycles for 1200 cycles at 200 mA g−1 with a capacity of 103.7 mA h g−1, indicating the high application potential of the electrode for highly stable rechargeable batteries.
中文翻译:
用于快速钾/钠离子存储的基于硒化铁的异质结构建和缺陷工程
钾离子电池(PIBs)和钠离子电池(SIBs)的发展迫切需要合适的具有高容量和长循环稳定性的负极材料,尤其是在高电流密度下的能力。在此,通过对 MOFs 前驱体进行硒化,设计了一种封装在 Se 掺杂碳 (NF 11 S/C) 中的多孔 Ni 掺杂 FeSe 2 /Fe 3 Se 4异质结。多孔复合材料具有丰富的活性位点并促进离子和电子的传输。采用Ni掺杂来丰富晶格缺陷和活性位点。Se-C 键和碳骨架赋予了复合材料的完整性,并阻碍了硒化物纳米颗粒在钾化/去钾化过程中的聚集。NF 11S/C 表现出优异的倍率性能和超长循环稳定性( PIB 在 2 A g -1下3050 次循环后为177.3 mA hg -1 ,对于 SIB ,在 8 A g -1下 2000 次循环后为 208.8 mA hg -1 )。通过异位 X 射线粉末衍射、高分辨率透射电子显微镜、X 射线光电子能谱和拉曼分析研究了钾化/去钾化机理。PTCDA//NF 11 S/C全电池在200 mA g -1下可稳定循环1200次,容量为103.7 mA hg -1,表明该电极在高稳定性可充电电池方面具有很高的应用潜力。
更新日期:2022-02-27
中文翻译:
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用于快速钾/钠离子存储的基于硒化铁的异质结构建和缺陷工程
钾离子电池(PIBs)和钠离子电池(SIBs)的发展迫切需要合适的具有高容量和长循环稳定性的负极材料,尤其是在高电流密度下的能力。在此,通过对 MOFs 前驱体进行硒化,设计了一种封装在 Se 掺杂碳 (NF 11 S/C) 中的多孔 Ni 掺杂 FeSe 2 /Fe 3 Se 4异质结。多孔复合材料具有丰富的活性位点并促进离子和电子的传输。采用Ni掺杂来丰富晶格缺陷和活性位点。Se-C 键和碳骨架赋予了复合材料的完整性,并阻碍了硒化物纳米颗粒在钾化/去钾化过程中的聚集。NF 11S/C 表现出优异的倍率性能和超长循环稳定性( PIB 在 2 A g -1下3050 次循环后为177.3 mA hg -1 ,对于 SIB ,在 8 A g -1下 2000 次循环后为 208.8 mA hg -1 )。通过异位 X 射线粉末衍射、高分辨率透射电子显微镜、X 射线光电子能谱和拉曼分析研究了钾化/去钾化机理。PTCDA//NF 11 S/C全电池在200 mA g -1下可稳定循环1200次,容量为103.7 mA hg -1,表明该电极在高稳定性可充电电池方面具有很高的应用潜力。