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在MXene@Co-P-S混合动力中的多重异构接口和异构结构工程促进高性能离子半/全电池

Yining Li¹, Shimei Wu¹, Zhiting Liu¹

¹School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China.

Inorganic chemistry

|September 26, 2024

概括

这项研究开发了用于离子电池的MXene@Co4S3/Co2P复合材料. 这些先进的阳极材料由于协同效应和改进的离子传输,表现出增强的性能.

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
纳米技术纳米技术

背景情况:

由于其高导电性,MXene纳米板是离子电池的阳极材料.
然而,MXene重新堆积和体积膨胀限制了它们的电化学性能.
开发混合结构可以减轻这些问题并提高电池性能.

研究的目的:

为了合成和表征一种新的异质硫化 (Co4S3/Co2P) 纳米晶/MXene纳米板复合物 (MXene@Co4S3/Co2P).
研究Co4S3,Co2P和MXene对电化学性能的协同作用.
了解离子储存机制和异构结构中的相变.

主要方法:

在现场生长之后进行高温化/硫化,以制备MXene@Co4S3/Co2P.
电化学测试,包括速度能力和循环稳定性测量.
使用X射线衍射 (XRD),电化学阻抗光谱 (EIS) 和X射线光电子光谱 (XPS) 的现场表征.

主要成果:

MXene@Co4S3/Co2P异构结构表现出极好的速率能力 (251.08 mAh g-1 在1 A g-1).
实现了卓越的循环稳定性,在5A g-1的407个循环后保留了198.69 mAh g-1.
由于协同效应和丰富的相位接口,观察到加速的电子转移和Na+扩散.

结论:

MXene@Co4S3/Co2P复合物有效地抑制了MXene重叠和颗粒聚合,减轻了体积膨胀.
开发的异构结构显示出作为离子电池的高性能阳极材料的巨大潜力.
这项工作为设计具有增强电化学性能的金属硫化物/MXene混合物提供了洞察力.

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