Porous MoS2/Carbon Spheres Anchored on 3D Interconnected Multiwall Carbon Nanotube Networks for Ultrafast Na Storage,Advanced Energy Materials

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Porous MoS2/Carbon Spheres Anchored on 3D Interconnected Multiwall Carbon Nanotube Networks for Ultrafast Na Storage
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-02-12 , DOI: 10.1002/aenm.201702909
Biao Chen ₁ , Huihui Lu ₁ , Jingwen Zhou ₁ , Chao Ye ₂ , Chunsheng Shi ₁ , Naiqin Zhao _{1,

3} , Shi-Zhang Qiao _{1,

2}

Affiliation

The performance of lithium and sodium‐ion batteries is partly determined by the microstructures of the active materials and anodes. Much attention has been paid to the construction of various nanostructured active materials, with emphasis on optimizing the electronic and ionic transport kinetics, and structural stability. However, less attention has been given to the functionalization of electrode microstructure to enhance performance. Therefore, it is significant to study the effect of optimized microstructures of both active materials and electrodes on the performance of batteries. In this work, porous MoS₂/carbon spheres anchored on 3D interconnected multiwall carbon nanotube networks (MoS₂/C‐MWCNT) are built as sodium‐ion battery anodes to synergistically facilitate the sodium‐ion storage process. The optimized MoS₂/C‐MWCNT possesses favorable features, namely few‐layered, defect‐rich, and interlayer‐expanded MoS₂ with abundant mesopores/macropores and carbon incorporation. Notably, the presence of 3D MWCNT network plays a critical role to further improve interparticle and intraparticle conductivity, sodium‐ion diffusion, and structural stability on the electrode level. As a result, the electrochemical performance of optimized MoS₂/C‐MWCNT is significantly improved. This study suggests that rational design of microstructures on both active material and electrode levels simultaneously might be a useful strategy for designing high performance sodium‐ion batteries.

中文翻译：

多孔MoS2 /碳球固定在3D互连的多壁碳纳米管网络上，用于超快的Na存储

锂和钠离子电池的性能部分取决于活性材料和阳极的微观结构。人们已经对各种纳米结构活性材料的构造给予了极大的关注，重点是优化电子和离子的输送动力学以及结构稳定性。但是，很少有人关注电极微结构的功能化以增强性能。因此，研究活性材料和电极的最佳微观结构对电池性能的影响具有重要意义。在这项工作中，多孔的MoS ₂ /碳球上的3D锚互连多层碳纳米管网络（MOS ₂/ C-MWCNT）作为钠离子电池阳极来构建，以协同促进钠离子存储过程。优化的MoS ₂ / C-MWCNT具有良好的特征，即层数少，缺陷多，层间扩展的MoS ₂具有丰富的中孔/大孔和碳结合。值得注意的是，3D MWCNT网络的存在在进一步提高颗粒间和颗粒内电导率，钠离子扩散以及电极水平上的结构稳定性方面起着至关重要的作用。结果，优化的MoS ₂的电化学性能/ C-MWCNT得到了显着改善。这项研究表明，同时在活性材料和电极水平上合理设计微观结构可能是设计高性能钠离子电池的有用策略。

更新日期：2018-02-12

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