Amino-functionalized MOF derived porous Fe3O4/N-doped C encapsulated within a graphene network by self-assembling for enhanced Li-ion storage,Sustainable Energy & Fuels

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Amino-functionalized MOF derived porous Fe3O4/N-doped C encapsulated within a graphene network by self-assembling for enhanced Li-ion storage
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-04-30 , DOI: 10.1039/d0se00112k
Weijuan Wang _{1,

2,

3,

4,

5} , Daming Chen _{1,

2,

3,

4,

5} , Hui Xu _{2,

5,

6,

7,

8} , Genxi Yu _{1,

2,

3,

4,

5} , Shangqi Sun _{1,

2,

3,

4,

5} , Wei Zhang _{1,

2,

3,

4,

5} , Jian Chen _{1,

2,

3,

4,

5}

Affiliation

Fe₃O₄ is regarded as one of the most promising anode materials for next generation lithium ion batteries. The main issues of the Fe₃O₄ anodes are the severe pulverization and instability of the solid-electrolyte interphase (SEI) layer caused by the large volume change during the charge/discharge processes, as well as poor electrical conductivity. In this study, graphene-wrapped porous Fe₃O₄/N-doped C frameworks that were synthesized by a facial MOF-derived strategy coupled with an electrostatic interaction induced self-assembly process are reported for enhanced lithium ion storage. In the resulting architecture, integrating porous Fe₃O₄/N-doped C frameworks into graphene with an encapsulated structure effectively prevents the structural degradation and facilitates the formation of a stable SEI layer during the cycles. Moreover, benefiting from the highly conductive continuous graphene network and hierarchical porous structure, the electron conduction and lithium ion diffusion of the electrode are greatly enhanced. In virtue of the unique structure engineering, the as-built electrode exhibits high reversible capacity (764 mA h g⁻¹ after 100 cycles at 0.2 A g⁻¹), excellent rate capability (370 mA h g⁻¹ at 8.0 A g⁻¹) and enhanced cycling stability (441 mA h g⁻¹ after 800 cycles at 2.0 A g⁻¹).

中文翻译：

通过自组装将氨基官能化的MOF衍生的多孔Fe3O4 / N掺杂的C包裹在石墨烯网络中，以增强锂离子存储

Fe ₃ O ₄被认为是下一代锂离子电池最有希望的负极材料之一。Fe ₃ O ₄阳极的主要问题是在充电/放电过程中由于体积变化大而导致的固体电解质中间相（SEI）层严重粉碎和不稳定性，以及导电性差。在这项研究中，报道了通过面部MOF衍生的策略结合静电相互作用诱导的自组装过程合成的石墨烯包裹的多孔Fe ₃ O ₄ / N掺杂C骨架，用于增强锂离子存储。在最终的架构中，集成了多孔Fe ₃ O ₄将N掺杂的C骨架掺入具有包封结构的石墨烯中可有效防止结构退化并在循环过程中促进稳定SEI层的形成。此外，得益于高导电性连续石墨烯网络和分层多孔结构，电极的电子传导和锂离子扩散得到了极大的增强。在凭借独特的结构工程的，已建成的电极表现出高的可逆容量（764毫安汞柱^-1 0.2 A G 100次循环后^-1，优异的倍率性能（370毫安汞柱）^-1在8.0 A克^-1）和增强的循环稳定性（441毫安汞柱^-1在2.0 A克800次循环后^-1）。

更新日期：2020-06-30

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