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一个独特的三维网络双核外结构S@MnO₂@MXene抑制了高硫含量高性能硫电池中的穿效应

Qing Li¹, Minhao Fu¹, Xiujuan Qin¹

¹Hebei Key Laboratory of Applied Chemistry, Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.

Journal of colloid and interface science

|July 2, 2024

概括

研究人员使用MXene纳米片开发了先进的硫 (Li-S) 电池. 这种新的结构通过抑制聚硫化物穿和提高导电性来提高Li-S电池的高效性能来增强能量储存.

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:

硫 (Li-S) 电池具有高的理论能量密度,但面临着诸如穿效应和体积膨胀等挑战.
有效的多硫化物 (LiPS) 转化对于商业化Li-S电池至关重要.

研究的目的:

为Li-S电池开发一种新的结构,加速LiPS转换并提高整体性能.
研究MXene纳米板涂层对S@MnO2核心外结构对增强Li-S电池应用的影响.

主要方法:

静电自组装方法用于将超薄的MXene纳米片涂在S@MnO2核心外结构上.
制造一个高导电性的三维网络,以改善电子和离子传输.
使用循环电压测量 (CV) 和Li2S沉积研究进行电化学表征.

主要成果:

该S@MnO2@MXene结构有效地抑制了LiPSs的扩散,并加速了它们的转化.
在1C时达到842 mAh/g的高容量,容量衰减最小 (0.84 mAh/g每周期超过500个周期).
证明了6.33 mAh cm-2的面积容量,硫载量为5.88 mg cm-2,表明了实际潜力.

结论:

开发的S@MnO2@MXene结构显著提高了Li-S电池的催化性能和稳定性.
这种方法为克服Li-S电池技术的关键局限性提供了一个有希望的策略.
该研究证明了工程电极材料在下一代能源存储方面的实际应用.

关键词:

催化层是一种催化层.双核外结构结构双核外结构含有高硫含量的高硫含量这种电池是Li-S电池.在S@MnO(2)@MXene中使用.

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