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电子移位催化剂用于高性能,低温的Li-S电池

Jing Zhang¹, Lin Li¹, Mannan Yang¹

¹School of Materials Science and Engineering & Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710048, China. tianna@xaut.edu.cn.

Chemical communications (Cambridge, England)

|November 5, 2024

概括

低温硫电池面临缓慢的转换动力学. 在三氧化瓦纳 (ODVO@PCN) 上引入氧缺陷,可增强Li+扩散和氧化还原反应,提高低温下电池的性能.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

低温硫电池 (LT-LSB) 由于 Li+ 扩散缓慢,因此具有较差的聚硫化物转化动力学.
有效的电荷转移和离子传输对于LT-LSB的性能至关重要.

研究的目的:

开发一种新的纳米催化剂,用于提高低温硫电池的动力学.
研究氧气缺陷和电子移位对催化剂性能的影响.

主要方法:

合成的三氧化物 (V2O3) 固定在一个有孔的碳网络上,引入了氧缺陷 (ODVO@PCN).
利用电子移位策略来创建重建的V2+活性站点.
研究了V2+位点和硫物种之间的相互作用,以增强Li+转化.

主要成果:

该ODVO@PCN催化剂在电解质/电极接口上显示出增强的Li+转换动力学.
在0°C时,带有ODVO@PCN的电池在1°C时达到501mA hg-1,在0.5°C时达到400个循环.
在-10°C下,电池保持了706 mA hg-1,在100个循环后保持了85%的容量.

结论:

在多孔碳上缺氧的V2O3 (ODVO@PCN) 有效地促进LT-LSB中的快速氧化还原反应.
在V2+位点和硫物种之间增强的相互作用提高了低温性能.
ODVO@PCN显示出作为先进硫电池的动力促进剂的巨大潜力.

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