Hierarchical MoS2@N‐Doped Carbon Hollow Spheres with Enhanced Performance in Sodium Dual‐Ion Batteries,ChemElectroChem

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Hierarchical MoS2@N‐Doped Carbon Hollow Spheres with Enhanced Performance in Sodium Dual‐Ion Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-11-30 , DOI: 10.1002/celc.201801282
Zhongyu Li ₁ , Liwen Yang _{1,

2} , Guobao Xu ₁ , Xiong Liu ₁ , Xiaolin Wei ₁ , Juexian Cao ₁ , Paul K. Chu ₂

Affiliation

Sodium dual‐ion batteries (S‐DIBs) are attracting increasing interest in large‐scale electrical energy storage, owing to low‐cost and abundant sodium resources and the crucial need to develop high‐performance anode materials to spur the large‐scale application of S‐DIBs. In this work, hierarchical hollow spheres assembled from interconnected few‐layer MoS₂ nanosheets with an N‐doped carbon coating (designated as MoS₂@NC HHSs) are designed and synthesized. An S‐DIBs full cell is fabricated with MoS₂@NC HHSs as the anode, expanded graphite as the cathode, and 1.0 M NaPF₆ in EC/DMC/EMC (1 : 1 : 1, volume ratio) as the electrolyte. The combined effects rendered by the ultrathin MoS₂ subunits, hollow interior, and N‐doped carbon coating not only promote the reaction kinetics and capacitive‐controlled Na storage, but also guarantee outstanding mechanical stability during Na⁺ intercalation/deintercalation. The MoS₂@NC HHSs‐based S‐DIBs deliver a high reversible capacity of 45 mAhg⁻¹ at 2 Ag⁻¹ and exhibit good cycling performance with a stable reversible capacity of 40 mAhg⁻¹ and high coulombic efficiency beyond 90 % at 1 Ag⁻¹ for 500 cycles. The MoS₂@NC HHSs have great potential in high‐performance S‐DIBs.

中文翻译：

在钠双离子电池中具有增强性能的分层MoS2 @ N掺杂碳空心球

钠双离子电池（S-DIB）由于低成本和丰富的钠资源以及开发高性能负极材料以刺激大规模应用的迫切需求，因此在大型电能存储中引起了越来越多的兴趣。 S-DIB。在这项工作中，设计并合成了由互连的多层MoS ₂纳米片和N掺杂碳涂层（称为MoS ₂ @NC HHS）组装而成的分层空心球。用MoS ₂ @NC HHSs作为阳极，膨胀石墨作为阴极，并在EC / DMC / EMC中以1.0 M NaPF ₆（1：1：1，体积比）作为电解质来制造S-DIBs全电池。超薄MoS _2带来的综合效果亚单元，中空内部和N掺杂碳涂层不仅可以促进反应动力学和电容控制的Na储存，而且还可以确保在Na ⁺嵌入/脱嵌过程中出色的机械稳定性。基于MoS ₂ @NC HHS的S-DIB在2 Ag ^-1时具有45 mAhg ^-1的高可逆容量，并具有良好的循环性能，在40 mAhg ^-1时具有稳定的可逆容量，并且在1时具有超过90％的高库仑效率Ag ^-1 500个循环。MoS ₂ @NC HHS在高性能S-DIB中具有巨大的潜力。

更新日期：2018-11-30

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