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纳米@纳米管的双封闭效应抑制了高性能硫电池的聚硫化物穿效应

Bin Yue¹, Lili Wang¹, Ningyuan Zhang²

¹College of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China.

Small (Weinheim an der Bergstrasse, Germany)

|November 27, 2023

概括

一个新的Co/CoN-碳纳米@TiO2-碳纳米管结构有效地抑制了硫电池的穿效应,使商业化高性能和长周期寿命成为可能.

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:

多硫化物 (LiPSs) 的穿效应是硫 (Li-S) 电池商业化的主要障碍.
开发高导电性碳基宿主材料对于减轻这种穿效应至关重要.

研究的目的:

设计和合成一种新的阴极主体材料,以抑制Li-S电池中的LiPSs穿效应.
为了研究设计材料的电化学性能和机制.

主要方法:

通过电和化,制造一个独特的Co/CoN-碳纳米@TiO2-碳纳米管 (NC@TiO2-CNTs) 结构.
使用NC@TiO2-CNTs阴极主体的Li-S电池的电化学测试.
密度函数理论 (DFT) 计算以阐明催化和吸附机制.

主要成果:

该NC@TiO2-CNTs阴极主体表现出高硫利用率 (在0.2°C时1527mAhg-1) 和优异的速率能力 (在5°C时663mAhg-1).
显著的循环稳定性,在1C时500个循环中,每个循环的容量损失为0.056%的低容量损失.
在极端条件下 (高硫负载) 的异常性能,可逆容量为4 mAh cm-2.
DFT计算证实了Co/CoN异构和TiO2在吸附和催化LiPS转换中的协同作用.

结论:

构建的NC@TiO2-CNTs材料通过双重机制 (纳米和纳米管) 有效地限制LiPSs,显著抑制了穿效应.
该材料为提高Li-S电池的性能和商业可行性提供了一个有希望的战略.

关键词:

这种电池是LiS电池.双重限制效应的双重限制效应电力旋转是指电力旋转.主机材料 - 主机材料在nanocages@nanotubes上使用.

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