Polysulfides adsorption and catalysis dual-sites on metal-doped molybdenum oxide nanoclusters for Li-S batteries with wide operating temperature

IF 9.5 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Jieshuangyang Chen, Jie Lei, Jinwei Zhou, Xuanfeng Chen, Rongyu Deng, Mingzhi Qian, Ya Chen, Feixiang Wu
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引用次数: 0

Abstract

The development of electrocatalysts with high catalytic activity is conducive to enhancing polysulfides adsorption and reducing activation energy of polysulfides conversion, which can effectively reduce polysulfide shuttling in Li-S batteries. Herein, a novel catalyst NiCo-MoOx/rGO (rGO = reduced graphene oxides) with ultra-nanometer scale and high dispersity is derived from the Anderson-type polyoxometalate precursors, which are electrostatically assembled on the multilayer rGO. The catalyst material possesses dual active sites, in which Ni-doped MoOx exhibits strong polysulfide anchoring ability, while Co-doped MoOx facilitates the polysulfides conversion reaction kinetics, thus breaking the Sabatier effect in the conventional electrocatalytic process. In addition, the prepared NiCo-MoOx/rGO modified PP separator (NiCo-MoOx/rGO@PP) can serve as a physical barrier to further inhibit the polysulfide shuttling effect and realize the rapid Li+ migration. The results demonstrate that Li-S coin cell with NiCo-MoOx/rGO@PP separator shows excellent cycling performance with the discharge capacity of 680 mAh·g−1 after 600 cycles at 1 C and the capacity fading of 0.064% per cycle. The rate performance is also impressive with the remained capacity of 640 mAh·g−1 after 200 cycles even at 4 C. When the sulfur loading is 4.0 mg·cm−2 and electrolyte volume/sulfur mass ratio (E/S) ratio is 6.0 μL·mg−1, a specific capacity of 830 mAh·g−1 is achieved after 200 cycles with a capacity decay of 0.049% per cycle. More importantly, the cell with NiCo-MoOx/rGO@PP separator exhibits cycling performance under wide operating temperature with the reversible capacities of 518, 715, and 915 mAh·g−1 after 100 cycles at −20, 0, and 60 °C, respectively. This study provides a new design approach of highly efficient catalysts for sulfur conversion reaction in Li-S batteries.

金属掺杂氧化钼纳米簇上的多硫化物吸附和催化双基点,用于宽工作温度的锂-S 电池
开发具有高催化活性的电催化剂有利于提高多硫化物的吸附能力,降低多硫化物转化的活化能,从而有效减少多硫化物在锂-S 电池中的穿梭。本文以安德森型多氧金属盐为前驱体,静电组装在多层 rGO 上,得到了一种超纳米尺度、高分散性的新型催化剂 NiCo-MoOx/rGO(rGO = 还原型石墨烯氧化物)。该催化剂材料具有双重活性位点,其中掺杂镍的氧化钼具有很强的多硫化物锚定能力,而掺杂钴的氧化钼则促进了多硫化物的转化反应动力学,从而打破了传统电催化过程中的萨巴蒂尔效应。此外,制备的镍钴氧化物/rGO 改性聚丙烯隔膜(NiCo-MoOx/rGO@PP)可作为物理屏障进一步抑制多硫化物的穿梭效应,实现 Li+ 的快速迁移。结果表明,采用镍钴氧化物/rGO@PP 隔离层的锂-S 纽扣电池具有优异的循环性能,在 1 C 下循环 600 次后,放电容量为 680 mAh-g-1,每个循环的容量衰减率为 0.064%。当硫含量为 4.0 mg-cm-2、电解质体积/硫质量比(E/S)为 6.0 μL-mg-1 时,200 个循环后的比容量为 830 mAh-g-1,每个循环的容量衰减为 0.049%。更重要的是,采用镍钴氧化物/rGO@PP 隔膜的电池在较宽的工作温度下表现出良好的循环性能,在 -20、0 和 60 °C 下循环 100 次后,可逆容量分别达到 518、715 和 915 mAh-g-1。这项研究为锂-S 电池中硫转化反应的高效催化剂提供了一种新的设计方法。
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来源期刊
Nano Research
Nano Research 化学-材料科学:综合
CiteScore
14.30
自引率
11.10%
发文量
2574
审稿时长
1.7 months
期刊介绍: Nano Research is a peer-reviewed, international and interdisciplinary research journal that focuses on all aspects of nanoscience and nanotechnology. It solicits submissions in various topical areas, from basic aspects of nanoscale materials to practical applications. The journal publishes articles on synthesis, characterization, and manipulation of nanomaterials; nanoscale physics, electrical transport, and quantum physics; scanning probe microscopy and spectroscopy; nanofluidics; nanosensors; nanoelectronics and molecular electronics; nano-optics, nano-optoelectronics, and nano-photonics; nanomagnetics; nanobiotechnology and nanomedicine; and nanoscale modeling and simulations. Nano Research offers readers a combination of authoritative and comprehensive Reviews, original cutting-edge research in Communication and Full Paper formats. The journal also prioritizes rapid review to ensure prompt publication.
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