具有化学吸附和电催化性能的NiSn/氮掺杂石墨烯复合材料作为锂硫电池的先进隔膜改性材料

NiSn/nitrogen-doped graphene composite with chemisorption and electrocatalysis as advanced separator modifying material for lithium sulfur batteries.

作者信息

Qi Xinmei, Huang Liwu, Luo Yiteng, Chen Qinghao, Chen Yungui

机构信息

College of Materials Science and Engineering, Sichuan University, Chengdu 610065, PR China.

College of Materials Science and Engineering, Sichuan University, Chengdu 610065, PR China; Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education, Chengdu 610065, PR China.

出版信息

J Colloid Interface Sci. 2022 Dec 15;628(Pt B):896-910. doi: 10.1016/j.jcis.2022.08.031. Epub 2022 Aug 10.

DOI:10.1016/j.jcis.2022.08.031

PMID:36030715

Abstract

Lithium-sulfur batteries have been widely studied because of their advantages of abundant reserves, environmental friendliness, low cost andhighspecific capacity. However, the volume expansionand the low electrical conductivity of sulfur, and the shuttle effect of polysulfides limit their application. Herein,wesynthesizea two-dimensional layered NiSn/nitrogen-doped graphene (NG) composite asseparator modifying material for lithium-sulfur batteries. The NiSnformed by dual metal salts Ni(NO)·6HO and SnCl·2HO can adsorb polysulfide and catalyze its transformation to improve the electrochemical reaction kinetics. Moreover, the layered NG can not only disperse the NiSnparticles, but alsoensure rapid electron transfer. Therefore, the lithium-sulfur battery with the NiSn/NG modified separator shows excellent electrochemical performance. At a current rate of 1 C, the lithium-sulfur battery with the NiSn/NG modified separator can provide a high initial discharge capacity of 1022.1 mAh gand maintain a reversible specific capacity of 758.3 mAh gafter 400 cycles.

摘要

锂硫电池因其具有储量丰富、环境友好、成本低和比容量高等优点而受到广泛研究。然而，硫的体积膨胀、低电导率以及多硫化物的穿梭效应限制了它们的应用。在此，我们合成了一种二维层状NiSn/氮掺杂石墨烯（NG）复合材料作为锂硫电池的隔膜改性材料。由双金属盐Ni(NO₃)₂·6H₂O和SnCl₂·2H₂O形成的NiSn可以吸附多硫化物并催化其转化，以改善电化学反应动力学。此外，层状的NG不仅可以分散NiSn颗粒，还能确保快速的电子转移。因此，具有NiSn/NG改性隔膜的锂硫电池表现出优异的电化学性能。在1 C的电流速率下，具有NiSn/NG改性隔膜的锂硫电池可提供1022.1 mAh g的高初始放电容量，并且在400次循环后保持758.3 mAh g的可逆比容量。