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高的MXene作为对先进的Li-S全电池的双功能调解器

Qi Liang¹, Sizhe Wang^1,2, Xiaomeng Lu³

¹School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi'an 710021, China.

|January 9, 2024

概括

这项研究引入了一种新型高度MXene合石墨烯复合物 (HE-MXene/G@PP) 来解决硫电池 (LSB) 中的聚硫化物穿效应. 这种介质增强LiPS的氧化还原动力学,并促进稳定的沉积,以提高电池性能.

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:

硫电池 (LSB) 提供高能量密度,但受到聚硫化物穿效应的限制.
聚硫化物穿效应导致LSB的容量色和周期寿命较低.
现有的解决方案往往无法解决多硫化物捕获和均沉积的问题.

研究的目的:

开发一种用于LSB分离器修改的双功能调解器.
为了减轻聚硫化物穿效应并改善阳极稳定性.
提高 LSB 的整体性能和周期寿命.

主要方法:

制造一个高的MXene-doped石墨烯复合物 (HE-MXene/G@PP).
使用密度函数理论 (DFT) 计算,现场拉曼光谱和电化学阻抗光谱 (EIS) 进行分析.
在各种条件下测试了材料的性能,在Lithium-N-Li对称细胞和LSB中进行测试.

主要成果:

该HE-MXene/G@PP复合物显示出高电导率和丰富的活性点,可以有效地捕获聚硫化物.
"尾酒效应"和格子扭曲的协同效应促进了LiPSs快速的氧化还原反应和无树的沉积.
实现了优异的长期循环稳定性 (在1200个循环后每周期衰减0.026%/0.031%) 和 6000小时的稳定性Li DC 电池性能.

结论:

该HE-MXene/G@PP复合物有效地抑制了聚硫化物穿效应,并促进了均的沉积.
这种双功能调解器策略提供了一种有前途的方法,可以同时解决硫阴极和阳极的挑战.
开发的材料显著提高了高能量密度硫电池的循环寿命和稳定性.

关键词:

在TiVNbMoC3C3中使用.这是一种尾酒效应.高的MXene是一种高的MXene.硫电池是硫电池的一种.金属活性部位的金属活性部位.

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