Direct impregnation of SeS2 into a MOF-derived 3D nanoporous Co–N–C architecture towards superior rechargeable lithium batteries†,Journal of Materials Chemistry A

当前位置： X-MOL 学术 › J. Mater. Chem. A › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Direct impregnation of SeS2 into a MOF-derived 3D nanoporous Co–N–C architecture towards superior rechargeable lithium batteries†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-05-04 00:00:00 , DOI: 10.1039/c8ta02434k
Jiarui He _{1,

2,

3} , Weiqiang Lv _{4,

5,

6,

7} , Yuanfu Chen _{1,

2,

3} , Jie Xiong _{1,

2,

3} , Kechun Wen _{4,

5,

6,

7} , Chen Xu _{1,

2,

3} , Wanli Zhang _{1,

2,

3} , Yanrong Li _{1,

2,

3} , Wu Qin _{7,

8,

9,

10,

11} , Weidong He _{1,

2,

3,

4,

5}

Affiliation

Metal–organic framework (MOF) derived cobalt- and nitrogen-doped porous carbon (Co–N–C) polyhedra are employed, for the first time, as SeS₂ immobilizers (Co–N–C/SeS₂). As the cathode of lithium–sulfur (Li–S) batteries, the Co–N–C/SeS₂ composite with a high loading (66.5 wt%) of SeS₂ delivers a reversible capacity of 1165.1 mA h g⁻¹ and an over 84.1% capacity retention of the initial capacity (970.2 mA h g⁻¹) with a nearly 100% coulombic efficiency after 200 cycles. The Co–N–C/SeS₂ cathode shows excellent rate performances with capacities of 760 mA h g⁻¹, 604.1 mA h g⁻¹, and 439.7 mA h g⁻¹ at 1C, 2C, and 4C, respectively. The redox chemistry of SeS₂ is revealed by in situ Raman spectroscopic analysis and density functional theory (DFT) simulations. The superior electrochemical performance of the cathode is attributed to the unique Co–N–C structure with abundant micropores and uniformly-embedded ultrafine Co nanoparticles, which provide abundant SeS₂ absorption and catalytically active sites and efficiently prevent the dissolution of polysulfides and polyselenides. The conductive Co–N–C framework facilitates fast electron and ion transfer in electrochemical reactions. Our work facilitates the development of high-performance cathodes for Li–S batteries.

中文翻译：

将SeS ₂直接浸渍到MOF衍生的3D纳米多孔Co-N-C体系结构中，从而制成高级可充电锂电池†

金属-有机骨架（MOF）衍生的钴和氮掺杂多孔碳（Co-N-C）多面体首次用作SeS ₂固定剂（Co-N-C / SeS ₂）。作为锂硫（Li–S）电池的阴极，高负荷（66.5 wt％）SeS ₂的Co–N–C / SeS ₂复合材料的可逆容量为1165.1 mA hg ^-1，超过84.1。200次循环后，初始容量（970.2 mA hg ^-1）的容量保持率％，库仑效率接近100％。共同-N-C / SES _2个阴极表现出优异的倍率特性与760毫安汞容量^-1，604.1毫安汞柱^-1，和439.7毫安汞柱^-1分别位于1C，2C和4C。通过原位拉曼光谱分析和密度泛函理论（DFT）模拟揭示了SeS ₂的氧化还原化学。阴极的优异电化学性能归因于独特的Co-N-C结构，具有丰富的微孔和均匀包埋的超细Co纳米颗粒，可提供丰富的SeS ₂吸收和催化活性位，并有效防止多硫化物和多硒化物的溶解。导电的Co–N–C框架促进了电化学反应中电子和离子的快速转移。我们的工作促进了Li-S电池高性能阴极的开发。

更新日期：2018-05-04

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11