Effective polysulfides regulation in high-performance Li–S batteries via novel VO2–VS2 heterostructure

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2025-02-28 DOI:10.1007/s12598-024-03137-2

Yao-Lin Hou, Yu-Qing Zhang, Dan Li, Hai-Ming Xie, Jia Liu, Yu-Long Liu, Jie-Fang Zhu

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引用次数: 0

Abstract

Developing effective heterostructure strategies to mitigate the shuttling effect and accelerate lithium polysulfide (LiPS) conversion remains a critical challenge in lithium–sulfur (Li–S) batteries. Here, we report the first carbon–free VO₂–VS₂ heterostructure material synthesized via in situ sulfurization, applied as a modifier on a commercial polypropylene (PP) separator (denoted as VO₂–VS₂@PP). The as–prepared VO₂–VS₂ nanorods synergistically combine the high absorptivity of VO₂ with the efficient catalytic properties of VS₂, simultaneously enhancing LiPS anchoring and promoting its conversion. We systematically investigate the influence of material composition on battery performance, leveraging these functional attributes, Li–S cells incorporating VO₂–VS₂@PP exhibit exceptional cycle stability (over 500 cycles at 1C), impressive rate performance (807 mAh·g^–1 at 5C), desirable reversibility (49.9% capacity retention after 300 cycles at 5C) and exceptional pouch cell performance (3.65 mAh·cm^–2 after 50 stable cycles at 0.1C). This study underscores the potential of tailored heterostructures in realizing high–performance Li–S batteries, offering new insights for next–generation energy storage solutions.

Graphical abstract

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新型VO2-VS2异质结构对高性能锂电池多硫化物的有效调控

开发有效的异质结构策略来减轻穿梭效应并加速多硫锂（lip）的转化仍然是锂硫（li -硫）电池的关键挑战。在这里，我们报道了第一种通过原位硫化合成的无碳VO2 - vs2异质结构材料，并将其用作商用聚丙烯（PP）分离器（记为VO2 - VS2@PP）的改性剂。所制备的VO2 - VS2纳米棒将VO2的高吸收率与VS2的高效催化性能协同结合，同时增强了LiPS的锚定并促进了其转化。我们系统地研究了材料成分对电池性能的影响，利用这些功能属性，含有VO2 - VS2@PP的Li-S电池表现出优异的循环稳定性（在1C下超过500次循环），令人印象深刻的倍率性能（在5C下807 mAh·g-1），理想的可变性（在5C下300次循环后容量保持49.9%）和优异的袋状电池性能（在0.1C下50次稳定循环后容量保持3.65 mAh·cm-2）。这项研究强调了定制异质结构在实现高性能Li-S电池方面的潜力，为下一代储能解决方案提供了新的见解。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.