一步合成空心球形Co/Ni氢氧化物作为多功能多硫化物介质,以引导高性能锂硫电池的硫氧化还原动力学

IF 9.5 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Zhen Li, Man Yang, Qing Li, Xianghan Cheng, Fengting Geng, Yuye Wang, Xiaoli Wang, Dashuai Zhang, Yongzheng Zhang, Xiuling Zhang, Zhongmin Liu, Xuliang Pang and Longlong Geng
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引用次数: 0

摘要

加速硫氧化还原反应动力学和抑制多硫化物锂(LiPSs)的穿梭效应被认为是提高锂硫电池性能的根本途径。在本研究中,开发了一种一步简便的方法来控制合成多孔H-CoxNi1−x硫载体。实验分析和理论计算均表明,硫宿主的电子结构和d轨道的调制有利于调控硫宿主与LiPSs之间的电子耦合相互作用,从而优化反应物与催化剂之间的结合能。Co和Ni的协同催化作用进一步促进了硫氧化还原反应的动力学。得益于上述特性,h - co0.4 ni0.6对LiPSs具有优异的吸附催化性能,经过250次循环后可获得696.1 mA h g−1的高可逆容量。本研究提供了一种提高lbs性能的新策略,并为lbs的组成和电子结构如何影响吸附催化性能提供了新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

One-step synthesis of hollow spherical Co/Ni hydroxides as multifunctional polysulfide mediators to steer sulfur redox kinetics for high performance lithium–sulfur batteries†

One-step synthesis of hollow spherical Co/Ni hydroxides as multifunctional polysulfide mediators to steer sulfur redox kinetics for high performance lithium–sulfur batteries†

Accelerating the kinetics of sulfur redox reactions and suppressing the shuttle effect of lithium polysulfides (LiPSs) have been considered as the fundamental route to boost the performance of lithium–sulfur batteries (LSBs). In this study, a one-step facile method has been developed to controllably synthesize a porous H-CoxNi1−x sulfur host. Both the experimental analysis and theoretical calculations illustrated that the modulated electronic structure and d-orbitals of the sulfur host are beneficial to regulate the electronic coupling interactions between the LiPSs and sulfur hosts, thus optimizing the binding energies between the reactants and the catalysts. The synergistic catalysis effect of Co and Ni further promotes the kinetics for sulfur redox reactions. Benefiting from the above characteristics, H-Co0.4Ni0.6 displayed an excellent adsorption-catalysis performance for LiPSs and a high reversible capacity of 696.1 mA h g−1 was achieved after 250 cycles. The present study provides a novel strategy to boost the performance of LSBs, and offers a new insight into how the composition and electronic structure influence the adsorption-catalysis performance.

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来源期刊
Journal of Materials Chemistry A
Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
19.50
自引率
5.00%
发文量
1892
审稿时长
1.5 months
期刊介绍: The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.
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