Polyaniline Encapsulated Amorphous V2O5 Nanowire‐Modified Multi‐Functional Separators for Lithium–Sulfur Batteries,Small Methods

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Polyaniline Encapsulated Amorphous V2O5 Nanowire‐Modified Multi‐Functional Separators for Lithium–Sulfur Batteries
Small Methods ( IF 10.7 ) Pub Date : 2021-01-25 , DOI: 10.1002/smtd.202001056
Kai Chen ₁ , Guodong Zhang ₂ , Liangping Xiao ₃ , Pengwei Li ₁ , Wanli Li ₂ , Qingchi Xu ₁ , Jun Xu _{1,

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Affiliation

Designing multi‐functional separators is one of the effective strategies for achieving high‐performance lithium–sulfur (Li–S) batteries. In this work, polyaniline (PANI) encapsulated amorphous vanadium pentoxide (V₂O₅) nanowires (general formula V₂O₅·nH₂O and abbreviated as VOH) are synthesized by a facile in situ chemical oxidative polymerization method, and utilized as a basic building block for the preparation of functional interlayers on the commercial polypropylene (PP) separator, generating a VOH@PANI‐PP separator with multi‐functionalities. Compared to the crystalline V₂O₅, the amorphous V₂O₅ shows enhanced properties of polysulfide adsorption, catalytic activity, as well as ionic conductivity. Therefore, within the VOH@PANI‐PP separator, the amorphous V₂O₅ nanowire component contributes to the strong adsorption of polysulfides, the high catalytic activity for polysulfides conversion, and the high ionic conductivity. The PANI component further strengthens the above effects, improves the electrical conductivity, and enhances the flexibility of the modified separator. Benefiting from the synergistic effects, the VOH@PANI‐PP separator effectively suppresses polysulfide shuttling and improves the cycling stability of its composed Li–S batteries. This work provides a new research strategy for the development of efficient separators in rechargeable batteries by judiciously integrating the amorphous metal oxide with a conductive polymer.

中文翻译：

用于锂硫电池的聚苯胺封装无定形 V2O5 纳米线改性多功能隔膜

设计多功能隔膜是实现高性能锂硫（Li-S）电池的有效策略之一。在这项工作中，聚苯胺（PANI）封装的无定形五氧化二钒（V ₂ O ₅）纳米线（通式V ₂ O ₅ · n H ₂ O，缩写为VOH）通过简便的原位化学氧化聚合方法合成，并利用作为在商用聚丙烯 (PP) 隔膜上制备功能性夹层的基本构件，生成具有多功能的 VOH@PANI-PP 隔膜。与结晶 V ₂ O _{5 相比}，非晶 V ₂ O_图5显示了多硫化物吸附、催化活性以及离子电导率的增强特性。因此，在 VOH@PANI-PP 隔膜中，无定形 V ₂ O ₅纳米线组分有助于多硫化物的强吸附、多硫化物转化的高催化活性和高离子电导率。PANI组分进一步加强了上述作用，提高了导电性，增强了改性隔膜的柔韧性。受益于协同效应，VOH@PANI-PP隔膜有效地抑制了多硫化物穿梭并提高了其组成的Li-S电池的循环稳定性。这项工作通过明智地将无定形金属氧化物与导电聚合物相结合，为开发可充电电池中的高效隔膜提供了新的研究策略。

更新日期：2021-03-15

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