Designing 2D nickel hydroxide@graphene nanosheet composites to confine sulfur in highly stable lithium–sulfur batteries,Sustainable Energy & Fuels

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Designing 2D nickel hydroxide@graphene nanosheet composites to confine sulfur in highly stable lithium–sulfur batteries
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2021-09-04 , DOI: 10.1039/d1se01060c
Pan Liu _{1,

2} , Yuruo Qi _{1,

2} , Sidra Jamil _{1,

2} , Fangyuan Xiao _{1,

2} , Wei Zhong _{1,

2} , Shu-Juan Bao _{1,

2} , Maowen Xu _{1,

2}

Affiliation

The major challenge of lithium–sulfur batteries (LSBs) is the ‘‘shuttle effect’’ of polysulfides. Herein, nickel hydroxide@graphene (Ni(OH)₂@GR) is synthesized as a sulfur carrier by a simple refluxing method to efficiently confine sulfur for highly stable LSBs. The two-dimensional (2D) vertical arrays of Ni(OH)₂ with extensive hydrophilic hydroxyl groups endow the cathode with powerful restriction and strong chemisorption ability of polysulfides. Besides, the typical 2D GR sheets provide a stable barrier for polysulfides and further accelerate the electron/ion migration transmission. Based on the Ni(OH)₂@GR sheet-to-sheet heterostructure, the electrodes achieve 72% sulfur loading and exhibit outstanding long-term cycling stability with a decay rate of only 0.002% per cycle at 1C for 500 cycles. This work offers a promising method to reasonably design 2D materials for sulfur host and lithium metal protection.

中文翻译：

设计二维氢氧化镍@石墨烯纳米片复合材料以限制高度稳定的锂硫电池中的硫

锂硫电池 (LSB) 的主要挑战是多硫化物的“穿梭效应”。在此，氢氧化镍@石墨烯（Ni(OH) ₂ @GR）通过简单的回流方法合成为硫载体，以有效地限制硫以获得高度稳定的 LSB。Ni(OH) ₂的二维（2D）垂直阵列具有广泛的亲水性羟基，赋予阴极强大的限制性和强化学吸附多硫化物的能力。此外，典型的二维 GR 片为多硫化物提供了稳定的屏障，并进一步加速了电子/离子迁移传输。基于 Ni(OH) ₂@GR 片对片异质结构，电极实现 72% 的硫负载并表现出出色的长期循环稳定性，在 1C 500 次循环中每个循环的衰减率仅为 0.002%。这项工作为合理设计用于硫主体和锂金属保护的二维材料提供了一种很有前景的方法。

更新日期：2021-09-22

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