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基于NiS₂/NiSe₂的多功能复合分离器同异构多面体促进高性能硫电池的多硫化物转换

Bo Zhang¹, Jiaxin Qie², Jiyuan You¹

¹School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

ACS applied materials & interfaces

|November 1, 2024

概括

使用NiS2/NiSe2同类异构多面体的新型复合分离器有效地固定聚硫化物. 这项创新显著提高了硫电池的性能和稳定性.

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:

聚硫化物的穿效应是高能量密度硫 (Li-S) 电池的工业化的主要障碍.
有效的固定和多硫化物的快速转化对于提高Li-S电池性能至关重要.

研究的目的:

开发新的复合材料分离器,可以抑制穿效应,并促进 Li-S 电池中的聚硫化物转化.
研究复合分离器提高Li-S电池性能的机制.

主要方法:

制造NiS2/NiSe2同类异构多面体 (HHP) 复合分离器.
在现场可视化对称细胞观察聚硫化物吸附.
电解质分离器接口接触模拟研究金属核化.
电化学性能测试 (特定容量,衰变率).

主要成果:

NiS2/NiSe2 HHP显示了多硫化物快速吸附和固定.
复合材料分离器促进了多硫化物的快速转化和金属的均核化.
观察到增强的Li+扩散系数和Li2S沉积能力.
带有NiS2/NiSe2 HHP分离器的电池实现了高初始特异性容量 (1224.1 mAh g-1在0.2°C) 和出色的循环稳定性 (0.073%的衰变率在2°C).

结论:

NiS2/NiSe2 HHP复合材料分离器有效地解决了Li-S电池中的穿效应.
分离器具有高的电化学催化活性和多个吸附点,用于快速的聚硫化物转化.
这项工作有助于开发高性能和工业可行的Li-S电池.

关键词:

电解质 - 分离器接口接口同源异构结构的同源异构结构.沉积的沉积方式 - 硫电池的使用情况.穿效应的穿效应

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