Synergistic effect of oxygen-deficient Ni3V2O8@carbon nanotubes-modified separator for advanced lithium–sulfur batteries

IF 11 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Rare Metals Pub Date : 2024-12-28 DOI:10.1007/s12598-024-03180-z

Zheng-Dao Pan, Zhou-Lu Wang, Xing-You Rao, Xiang Liu, Yi Zhang

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Abstract

Lithium–sulfur batteries (LSBs) have attracted widespread attention due to their high theoretical energy density. However, the dissolution of long-chain polysulfides into the electrolyte (the “shuttle effect”) leads to rapid capacity decay. Therefore, finding suitable materials to mitigate the shuttle effect of polysulfides is crucial for enhancing the electrochemical performance of lithium–sulfur batteries. In this study, LSBs’ separator is modified with Ni₃V₂O₈ nanoparticles@carboxylated carbon nanotubes (Ni₃V₂O₈@CNTs) composite. There are abundant oxygen vacancies in Ni₃V₂O₈@CNTs composite which plays a synergistic effect on shuttle effect. The Ni₃V₂O₈ can tightly anchor soluble polysulfides through oxygen vacancies, while the CNTs not only facilitate the transport of ions and electrons but also weaken the migration of polysulfides, limiting shuttle effect. As a result, the cycling stability of LSBs using Ni₃V₂O₈@CNTs-modified separator has been significantly improved (with a capacity decay rate of only 0.0334% after 1500 cycles at 4.0C). This study proposes a strategy to design modified separator for high-performance LSBs.

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贫氧Ni3V2O8@carbon纳米管改性隔膜对先进锂硫电池的协同效应

锂硫电池因其较高的理论能量密度而受到广泛关注。然而，长链多硫化物在电解液中的溶解（“穿梭效应”）导致容量迅速衰减。因此，寻找合适的材料来减轻多硫化物的穿梭效应对于提高锂硫电池的电化学性能至关重要。本研究采用Ni3V2O8 nanoparticles@carboxylated碳纳米管（Ni3V2O8@CNTs）复合材料对LSBs的分离器进行改性。Ni3V2O8@CNTs复合材料中存在丰富的氧空位，对穿梭效应起协同作用。Ni3V2O8可以通过氧空位紧密锚定可溶性多硫化物，而CNTs不仅促进了离子和电子的传递，而且减弱了多硫化物的迁移，限制了穿梭效应。结果表明，使用Ni3V2O8@CNTs-modified分离器的lsb的循环稳定性得到了显著提高（在4.0℃下循环1500次后，容量衰减率仅为0.0334%）。本研究提出了一种高性能lbs改性分离器的设计策略。图形抽象

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.