A one-pot synthesis of hetero-Co9S8–NiS sheets on graphene to boost lithium–sulfur battery performance,Inorganic Chemistry Frontiers

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A one-pot synthesis of hetero-Co9S8–NiS sheets on graphene to boost lithium–sulfur battery performance
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-04-03 , DOI: 10.1039/c9qi01691k
Liang Chen _{1,

2,

3,

4,

5} , Xuefang Xie _{1,

2,

3,

4,

5} , Zhian Zhang _{3,

4,

5,

6} , Xiangzhong Kong _{1,

2,

3,

4,

5} , Shuquan Liang _{1,

2,

3,

4,

5} , Anqiang Pan _{1,

2,

3,

4,

5}

Affiliation

Lithium–sulfur batteries have received extensive attention owing to abundant sulfur resources and high energy density. However, their practical applications are hindered by the low utilization of sulfur due to its poor electronic conductivity, the shuttle effect and the sluggish redox kinetics of soluble lithium polysulfides (LiPSs), thus resulting in severe fading capacity. In study, graphene decorated with hetero-Co₉S₈–NiS sheets (BMS-G) was employed as a host material to support S in cathodes. The hetero-Co₉S₈–NiS effectively confined numerous LiPS species by chemisorption, and expedited the redox kinetics of LiPS. Consequently, the cathode with the BMS-G composite delivered high reversible specific capacities of 1142.9 mA h g⁻¹ at 0.2 C and 705.8 mA h g⁻¹ at 2 C, and had an excellent cycling stability (only 0.031% capacity fading per cycle over 800 cycles at 1 C was observed).

中文翻译：

一锅法合成石墨烯上的异质Co9S8-NiS片材，以提高锂硫电池的性能

锂硫电池由于硫资源丰富且能量密度高而受到广泛关注。但是，由于硫的电子电导率差，穿梭效应和可溶性多硫化锂（LiPSs）的氧化还原动力学迟缓，硫的利用率低阻碍了它们的实际应用，从而导致严重的褪色能力。在研究中，装饰有杂Co ₉ S ₈ -NiS片材（BMS-G）的石墨烯被用作主体材料在阴极中支撑S。杂Co ₉ S ₈ -NiS通过化学吸附有效地限制了许多LiPS种类，并加速了LiPS的氧化还原动力学。因此，具有BMS-G复合材料的阴极可提供1142.9 mA hg的高可逆比容量^-1以0.2C和705.8毫安汞柱^-1在2℃，具有优异的循环稳定性（观察到只有0.031％的容量以上以1℃800个循环每循环衰落）。

更新日期：2020-04-03

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