导电炭黑内嵌石榴状纳米硅作为锂离子电池负极材料。

IF 3.7 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Yu Zhang, Pengliang Gu, Shiyue Zhang, Yanan Xu, Xinyi Fu, Wenkai Wang, Qing Hu, Hao Li, Zhan Shi, Hongbin Du
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引用次数: 0

摘要

硅材料作为锂离子电池的负极材料具有较高的理论比容量。Si/C复合材料减轻了体积膨胀,提高了导电性,从而改善了锂离子电池的电化学性能。在此,我们报告了一种基于低成本,易于获得的导电炭黑(XC)的新策略,该策略采用湿化学还原和化学气相沉积(CVD)技术相结合的方法制备了石榴状Si/C纳米复合材料。该制备首先涉及一种简便的湿化学方法,以控制XC内SiCl4的水解。随后,使用一种新型离子液体-镁还原系统,将得到的SiO2/XC前驱体在XC (Si/XC)中还原为高结晶Si颗粒,避免了传统高温镁还原过程中产生的副产品。最后,通过CVD在石榴状的Si/XC复合材料外层包裹一层碳层,形成纳米限制Si/C结构。复合材料在lib中表现出优异的可逆性能和良好的循环稳定性。400次循环后,在1 A g-1下,Si/XC@C-0.5复合材料的比容量最高,为835 mA h g-1,与活化后的第一次循环(688 mA h g-1)相比,容量保持率为121%。这项工作为制备用于lib的高性能Si/C复合材料提供了可重复和可扩展的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pomegranate-Like Nano-Confined Silicon Inside Conductive Carbon Black as Anode Materials for Lithium-Ion Batteries.

Si materials possess a high theoretical specific capacity when used as anode material in lithium-ion batteries (LIBs). Si/C composites mitigate volume expansion and enhance conductivity, thus achieving improved electrochemical performance in LIBs. Herein, we report a new strategy for preparing pomegranate-like Si/C nanocomposites based on low-cost, readily available conductive carbon black (XC) by using a combination of wet chemical reduction and chemical vapor deposition (CVD) techniques. The preparation first involves a facile wet chemical approach to controlled hydrolysis of SiCl4 within XC. Subsequently, the obtained SiO2/XC precursor is reduced to highly crystalline Si particles within XC (Si/XC) using a novel ionic liquid-magnesium reduction system, avoiding unwanted byproducts associated with conventional high-temperature magnesium reduction. Finally, a pomegranate-like Si/XC composite is coated with an outer carbon layer via CVD, forming a nano-confined Si/C structure. The composites exhibit excellent reversible capacity and good cycle stability in LIBs. At 1 A g-1 after 400 cycles, the Si/XC@C-0.5 composite delivered the highest specific capacity of 835 mA h g-1, exhibiting a capacity retention rate of 121% compared to the first cycle after activation (688 mA h g-1). This work provides reproducible and scalable means to prepare high-performance Si/C composites for LIBs.

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来源期刊
Chemistry - A European Journal
Chemistry - A European Journal 化学-化学综合
CiteScore
7.90
自引率
4.70%
发文量
1808
审稿时长
1.8 months
期刊介绍: Chemistry—A European Journal is a truly international journal with top quality contributions (2018 ISI Impact Factor: 5.16). It publishes a wide range of outstanding Reviews, Minireviews, Concepts, Full Papers, and Communications from all areas of chemistry and related fields. Based in Europe Chemistry—A European Journal provides an excellent platform for increasing the visibility of European chemistry as well as for featuring the best research from authors from around the world. All manuscripts are peer-reviewed, and electronic processing ensures accurate reproduction of text and data, plus short publication times. The Concepts section provides nonspecialist readers with a useful conceptual guide to unfamiliar areas and experts with new angles on familiar problems. Chemistry—A European Journal is published on behalf of ChemPubSoc Europe, a group of 16 national chemical societies from within Europe, and supported by the Asian Chemical Editorial Societies. The ChemPubSoc Europe family comprises: Angewandte Chemie, Chemistry—A European Journal, European Journal of Organic Chemistry, European Journal of Inorganic Chemistry, ChemPhysChem, ChemBioChem, ChemMedChem, ChemCatChem, ChemSusChem, ChemPlusChem, ChemElectroChem, and ChemistryOpen.
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