Porous MoS2/Carbon Spheres Anchored on 3D Interconnected Multiwall Carbon Nanotube Networks forUltrafast Na Storage
Porous MoS2/Carbon Spheres Anchored on 3D Interconnected Multiwall Carbon Nanotube Networks forUltrafast Na Storage
复制标题
锚定在 3D 互连多壁碳纳米管网络上的多孔 MoS2/碳球用于超快 Na 存储
DOI：
10.1002/aenm.201702909
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发表时间：
2018-05-25
影响因子：
27.8
通讯作者：
Qiao, Shi-Zhang
中科院分区：
文献类型：
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作者：
Chen, Biao;Lu, Huihui;Qiao, Shi-Zhang
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。人们对各种纳米结构活性材料的构建给予了很大的关注，重点是优化电子和离子传输动力学以及结构稳定性。然而，很少有人关注电极微观结构的功能化，以提高性能。因此，研究活性材料和电极的优化微观结构对电池性能的影响具有重要意义。在这项工作中，锚定在三维互连多壁碳纳米管网络（MoS 2/C-MWCNT）上的多孔MoS 2/碳球被构建为钠离子电池阳极，以协同促进钠离子存储过程。优化的MoS 2/C-MWCNT具有良好的特性，即少层，缺陷丰富，层间膨胀的MoS 2，具有丰富的中孔/大孔和碳掺入。值得注意的是，3D MWCNT网络的存在对于进一步改善颗粒间和颗粒内电导率、钠离子扩散和电极水平上的结构稳定性起着关键作用。结果表明，优化后的MoS 2/C-MWCNT的电化学性能得到显著提高。本研究表明，同时在活性材料和电极水平上合理设计微结构可能是设计高性能钠离子电池的有用策略。
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.