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超薄且无缺陷的聚胺层在现场聚合,以有效阻碍聚硫化物穿
Aqian Zheng1, Chunli Shen1, Kaijian Yan1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, Hubei, 430070, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|August 5, 2024
概括
研究人员开发了一种新的,无缺陷的聚胺层,用于硫 (Li-S) 电池分离器. 这种薄层有效地防止了聚硫化物穿,大大提高了电池的稳定性和高能耗应用的寿命.
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) 电池提供高能量密度,但面临诸如聚硫化物穿和-树突增长等挑战.
- 现有的分离器有粒子间隙,促进了聚硫化物迁移,阻碍了性能.
研究的目的:
- 在聚烯 (PP) 分离器上合成一个纳米级,无缺陷的交联聚胺 (PA) 层.
- 通过减轻聚硫化物穿,提高Li-S电池的稳定性和循环寿命.
主要方法:
- 在现场聚合,在PP分离器上创建1.5纳米薄的PA修饰层.
- 循环电压测量 (CV) 和飞行时间 (TOF) 测试,以评估聚硫化物扩散.
- 组装和循环的Li/Li对称电池和Li-S电池与修改的分离器.
主要成果:
- 该PA层有效地阻碍了聚硫化物扩散.
- /对称电池显示出较低的超电位 (12mV 1000小时后在1mA cm-2下).
- -S电池表现出低容量降解率 (每周期0.06%在1°C的450个循环中),并在袋式电池中50个循环后保持87.63%的容量.
结论:
- 无缺陷的PA层通过抑制聚硫化物穿,显著提高了Li-S电池的性能.
- 这种方法推进了隔离器修改,以改善Li-S电池应用.
- 这项研究鼓励进一步研究为下一代电池提供无缺陷的分离器修改.
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